TECHNICAL FIELD

[0002] The present disclosure relates to a sample preparation device, and in particular to a sample preparation device for preparing blood samples for testing.

BACKGROUND

[0003] Collecting blood for use in clinical diagnostics is complex. Typically, medical professionals must complete a number of steps to prepare and stabilize the specimens until they are picked up by the laboratory for analysis. These steps introduce a number of opportunities for errors which can impact patient care. In general, sample preparation includes manually inverting sample containers (or sample tubes). Different tube types may need to be inverted a specific number of times after collection in order to mix the blood with any chemical additives in the specimen container. The requirements for inversion vary, which can cause confusion and mistakes.

[0004] Sample preparation also involves waiting for serum tubes to clot. For instance, before centrifuging a serum container, it must be given time to clot. The collection technician may become impatient and centrifuge too early, or may become distracted and centrifuge too late. If the container is centrifuged too early, latent fibrin formation may cause diagnostic errors. If the container is centrifuged too late, the turnaround time may be slower which could impact patient care. These can go undetected if the collection technician does not record the time between collection and centrifugation. GP44, "Procedures for the Handling and Processing of Blood Specimens for Common Laboratory Tests," 4th Edition, published May 25, 2010 by the Clinical and Laboratory Standards Institute (CLSI), hereafter referred to as the "CLSI-GP44 standard", illustrate examples of the complexities of clotting.

. i - [0005] Another sample preparation step involves centrifuging serum and plasma tubes. Serum or plasma containers need to be centrifuged in order to separate the liquid portion of the blood from the cells prior to analysis. The longer samples wait before being centrifuged, the longer the cells remain in contact with the serum or plasma, and the greater the opportunity for analytical error. The amount of time after which anaiytes become compromised differs, as illustrated by examples from the CLSI-GP44 standard. For instance, according to the CLSI- GP44 standard: potassium in serum is stable up to 2 hours; insulin in plasma is stable up to 6 hours; iron in serum is stable up to 8 hours; free thyroxine (t4) in serum is stable up to 24 hours; and cholesterol in serum is stable up to 48 hours.

[0006] Sample preparation also involves sorting tubes by type. Tubes may be sorted into different containers depending on the type of tube or depending on the laboratory to which it will be sent. This is done manually or not at all. Furthermore, in some cases, tubes may need to be stored at a fixed temperature after collection. For instance, they may be stored at room temperature, refrigerated, or frozen at varying temperatures.

[0007] Healthcare providers use written procedures and formal employee training to reduce the likelihood and impact of errors related to the specimen preparation method described above. In some cases, these procedures and require the person collecting blood to have formal phlebotomy training and/or a phlebotomy license. Because of the high number of different tube types and the different handling procedures for each, healthcare providers often use visual aids to remind staff how to handle each tube type. This can be done using poster-sized wall charts that serve as a quick reference. It can also be implemented in the information systems used by the collection technicians, to remind them how to prepare each individual specimen. Collection technicians can also use timers to remind them when it's time to centrifuge or store a sample. The timer may be a stopwatch, a kitchen timer, a centrifuge timer, or a mobile device. These procedures are not failsafe and errors still occur. There is a need for advanced sample preparation systems that can minimize errors and complexities in this field.

SUMMARY

[0008] An embodiment of the present disclosure is sample preparation device. The sample preparation device includes a sample preparation module having a holder configured to hold the sample container, and an actuator coupled to the holder. The actuator is configured to cause the holder to repeatedly change a position of the sample container a set number of times when the sample container is held by the holder. The sample preparation device also includes a staging module configured to hold the sample container for a set period of time. The staging module includes a rack that holds the sample container when the sample container is released from the holder. The set period of time is sufficient to allow the blood in the sample container to further clot.

|00Θ9] Another embodiment of the present disclosure is a method for preparing a blood sample. The method includes holding a sample container with a holder of a sample preparation module. The method also includes actuating the holder while holding the sample container to repeatedly change a position of the sample container in order to initiate clotting of blood in the sample container. The method includes releasing the sample container from the holder. The method al so includes staging the sample container in a staging module for a set period of time, wherein the set period of time is sufficient to allow the blood in the sample container to clot.

BRIEF DESCRIPTION OF THE DRAWINGS fOOlO] The foregoing summary, as well as the following detailed description, will be better understood when read in conj nction with the appended drawings. The drawings show illustrative embodiments of the disclosure. It should be understood, however, that the application is not limited to the precise arrangements and instrumentalities shown.

[0011] Figure 1 is a top perspective view of a sample preparation device according to an embodiment of the present disclosure;

[0012] Figure 2 is a front view of the sample preparation device shown in Figure 1 , with internal components illustrated in dashed lines;

[0013] Figure 3 is a top plan view of the sample preparation device sho n in Figure 1,

[0014] Figure 4 is a side view the sample container shown in Figure 1 ;

[0015] Figure 5 A is a schematic partial cross-section of a portion of the sample preparation device shown in in Figure 1, illustrating the process of inverting the sample container and placement into the staging module;

[0016] Figure 5B is a schematic partial cross-section of a portion of the sample preparation device shown in in Figure 5 A, illustrating the sample container inverted; [0017] Figure 5C is a schematic partial cross-section of a portion of the sample preparation device shown in in Figure 5B, illustrating the sample container positioned for placement into the staging module;

[0018] Figure 6 is a schematic partial cross-section of a portion of the sample preparation device according to an alternative embodiment, illustrating inversion of the sample container and placement into the staging module;

[0019] Figure 7 is a schematic block diagram of the sample preparation device shown in Figure 1, illustrating a control system used to control operation of the sample preparation device show n in in Figure 1 ; and

[0020] Figure 8 is a schematic block diagram of the controller for the sample preparation device shown in Figure 1.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

[0021] Referring to Figures 1-3 and 5A-5C, embodiments of the present disclosure include a sample preparation device 10 that can prepare samples for testing and analysis via a test analyzer (not shown). The sample preparation device 10 includes a sample preparation module 20, a sample staging module 40, a scanning module 60, and a sample centrifugation module 70. The sample preparation device 10 also includes a controller 80 that is configured to control operation of the various components of the sample preparation device 10 described above. The sample preparation device 10 is configured to prepare biological samples, such as blood, contained with sample containers 90. Although the description below refers to blood samples, the sample preparation device 10 may be used to process other biological samples. The sample preparation device 0 is designed to process sample containers 90 in order to facilitate analysis of the blood sample, such as, for example, by initiating clotting, centrifuging the samples, etc. Processing of the blood samples via the sample preparation device 10 will be described below with reference to each module.

[0022] Referring to Figure 8, the controller 80 is used to control various operations of the sample preparation device 10. As illustrated, the controller 80 includes one or more processors 82, memory 84, and a communications unit 86. The processor 82 can execute instructions stored in the memory 84 in response to various inputs received from the modules 20, 40, 60, and 70 via the communications unit 86. The communications unit 86 can, in turn, transmit command signals to the modules that cause each module to execute an action or response as will be further described below.

[0023] Turning back to Figures 1-3, the sample preparation device 10 includes a device housing 12 that contains modules 20, 40, 60, 70 and the controller 80. It is, however, not essential that each module 20, 40, 60, 70 and controller 80 be contained by the device housing 12. As shown, the device housing 12 has a base 14, a top 16 spaced opposite the base 14 along a vertical direction V, and side walls 18 that extend from the base 14 toward the top 16. The device housing 12 includes mechanized doors (not numbered) that open to various storage compartments 19a and 19b into which the sample containers 90 are placed after a particular operation is completed. One or two compartments may be used or more than two compartments may be used. The compartments 19a and/or 19b may be refrigerated compartments.

Alternatively, the storage compartments may be maintained at room temperature without temperature control.

|0024] Referring now to Figure 4, the sample container 90 is configured to hold a sample of the biological fluid, such as blood. The sample container 90 has a lower end 92, an upper end 94, and a sidewall 96 that extends from the lower end 92 to the upper end 94. The sample container 90 extends along a central axis C, and has a height H that extends from the lower end 92 to the upper end 94 along the central axis C. The sample container 90 defines an internal volume that holds the biological fluid. In one example, the internal volume is sufficient to hold between 100 to 1000 μΐ of blood. In one example, the volume is between 300 and 600 μΐ. In another example, the volume is between 200 and 300 μΙ. For instance, the sample container 90 is sized to hold a micro-sample. However, in other embodiments, the sample container is sized to hold larger amounts of blood. For instance, the internal volume is sufficient to hold between lml up 1000 ml of blood. As shown, the sample container 90 includes a cap 98 that can close off the upper end 94 of the sample container 90. The sample container 90 may be at least partially transparent. In one example, the sample container 90 may be formed of gl ass. In another example, the sample container 90 is a polymeric material.

|002S] Continuing with Figure 4, the sample container 90 may also include an identifier 99 disposed along the sidewall 96. The identifier 99 has information encoded therein related to the sample container and the sample contained therein. The identifier 99 may be any machine readable image or design element positioned on the sample container 90. In one example, the identifier can be a code, an alphanumeric code, a bar code, a QR code, design image, or other element that is machine readable by the scanning module. The identifier 99 may be an electronic code that can be associated with collection of information concerning the sample. The information includes a wide range of information associated with the sample being tested. For instance, the information may include, but is not limited to, sample type, sample tube type, sample volume, patient identifier, patient date of birth, hospital number, social security number, requisition number, accession number, a unique random number, a planned test module, laboratory conducting the text, and/or treating physician. The identifier 99 may be formed into the sample container 90 so that it is integral or monolithic with the sample container. For instance, the identifier 99 may be formed in the sidewall 96 during manufacture, such as during molding, in another example, the identifier 99 may be etched into or deposited onto the sidewall 96. Alternatively, the identifier 99 may be attached to the sample container 90 with an adhesive or some other means. In this example, the identifier 99 may be added during manufacture or at the sample collection site.

[0026] Various types of sample containers may be used. In one instance, sample containers may be used in accordance with GP44, "Procedures for the Handling and Processing of Blood Specimens for Common Laboratory Tests," 4th Edition, published May 25, 2010 by the Clinical and Laboratory Standards Institute (CLSI), hereafter referred to as the "CLSI-GP44 standard." For instance, ethylenediaminetetraacetic acid (EDTA) tubes typically have a lavender cap and are used to stabilize whole blood for hematology determinations. EDTA containers must be inverted 10 times after collection to ensure proper mixing between whole blood and the K2EDTA anticoagulant. Another container type is lithium heparin gel containers. These containers typically have a mint gree cap and are used to separate plasma from whole blood via centrifugation. These containers must be inverted 10 times after collection to ensure proper mixing between whole blood and the lithium heparin anticoagulant. Another container type is serum gel containers, which typically have a gold cap and are used to accelerate clotting and separate serum from whole blood via centrifugation. They must be inverted 5 times after collection to ensure proper mixing between whole blood and the clot activator they contain. Serum containers have a red top and are used to separate serum from whole blood via centrifugation. They do not need to be inverted after collection because they do not contain an additive. Any one of these container types may be used in the sample preparation device 10 as described herein. [0027] Referring to Figures 1-3 and 5A-5C, once the sample container 90 is placed in the sample preparation module 20, the scanning module 60 is used to scan the identifier 99 of the sample container 90, The scanning module 60 may be any electronic device configured to scan and/or read a machine readable code. For instance, the scanning module 60 may be a bar code reader with a scanning unit (not shown) and a communications unit (not shown). The communications unit transmits the scanned identifier 99 to the controller. The scanning module 60 can also record a time that the sample container 90 is held by the sample preparation module 20. As shown, the scanning module 60 is integrated with the sample preparation device 10. However, in certain embodiments, the scanning module 60 can be a separate handheld unit, such as a smartphone or some other handheld reader. In such an example, the handheld computing device may include a camera that captures an image of the identifier. Software in the handheld unit can associate the captured information from the container with the stored information or a reference.

[0028] Continuing with Figures 1 -3 and 5A-5C, the sample preparation module 20 is used to a) invert the sample container 90 and blood sample contained therein and b) place the sample container into the staging module 40. As illustrated best in Figure 5A, the sample preparation module 20 has a holder 22 configured to hold the sample container 90 and an actuator 26 coupled to the holder 22 that moves the holder 22 into different positions in order invert the sample container 90. As shown, the holder 22 includes a housing 23 with an elongate receptacle 24 that extends through the housing 23. The housing 23 is operably coupled to a support 25. The support 25 can house the actuator 26. The housing may be a cylindrical structure (or some other shape) that include a receptacle 24 design, to hold the sample container 90. Within the receptacle 24 a ridge (not numbered) may be to help secure the sample container 90 in place. The ridge, however, is also designed to allow release the sample container when in a certain orientation. The actuator 26 may be any device that can cause rotational motion of the holder 22 in response to command signals and/or instructions from the controller 80. As illustrated, the housing 22 rotates about a rotation axis R. In this embodiment, the rotation axis R is located at the approximate center of the housing 22. However, the rotation axis R is not required to be along the center of the housing 22. The receptacle 24 has length that is sufficient to hold an entirety of a sample container 90.

[0029] Continuing with Figure 6, the actuator 26 causes the holder 22 to repeatedly change a position of the sample container 90 a set number of times, such as by inverting the containers about the rotation axis R. Inverting the containers may be performed for several purposes, which may include: 1 ) initiate clotting by encouraging mixing of blood with coagulant, 2) prevent clotting by encouraging mixing of blood with anticoagulant, or 3) improve preservation by encouraging mixing of blood with preservative. Inversion is therefore used to encourage the mixing of the blood with an additive that may be present in the sample container.

|003θ] The sample preparation module 20 is configured to invert the sample container 90 and to also release the sample container. For example. Figure 5A illustrates the holder 22 and sample container 90 in a first position Pi set to receive the sample container 90 from the user. Figure 5B illustrates the holder 22 rotated into a second P2 or an inverted position P2. The inverted position P2 is about 160 degrees offset from its initial position PI . However, the inversion may be more or less than about 160 degrees. The actuator 26 causes the holder 22 to repeatedly cycle through the first position I and the second (inverted) position P2 to invert the sample container 90. Progression of the sample container 90 through the first position PI to the second position P2 and back to the first position P I constitutes one cycle. One cycle is therefore a single instance of inversion. The phrase a "set number of times" therefore refers to a set number of cycles. The controller 80 (figure 7) actuates the actuator 26 in order to repeatedly change the position PI, P2 of the sample container 90 through one or more cycles. The actuator 26 may cause the holder 22 to invert the sample container 90 one cycle, two cycles, three cycles, or more. The number of cycles may be based on the type of sample container 90 and sample type. In one example, the controller 80 may be configured to invert the sample container 90 up to 10 or 20 cycles. More cycles may be used as needed.

[0031] As shown in Figure 5A and 5B, inversion of the sample container 90 through the cycle (or cycles) causes the container axis C to rotate around the rotation axis R. As shown, the rotation axis R is substantially angularly offset with respect to the central axis C. In one example, the rotation axis R is substantially perpendicular to the central axis C of the sample container 90. The rotation axis R need not be associated with the support 25. The rotation axis R can be located elsewhere so long as the axis C of the sample container 90 is angled (at 90 degrees or otherwise) relative to the rotation axis R. Thus, the sample container is rotated about the rotation axis R (at an angle) which is in contrast to simply rotating the sample container about the container axis C as is done in conventional tube rollers.

[0032] Turning now to Figure 5C, the actuator 26 has caused the holder to rotate in to a releasing position RP. In the releasing position RP, a top end of the receptacle is flip and aligned with the staging module, in this position, the sample container 90 can drop in to the staging module for processing as will be described further below.

[0033] As illustrated, each holder 22 holds a single sample container 90. In alternative embodiments, the holder may hold a plurality of sample containers 90. Likewise, the actuator would be configured to repeatedly change the position of the plurality of sample containers 90 held by the holder 22. As shown, the holder is configured as a clamp. The holder 22 can have other configurations designed to hold the sample container 90. For instance, the holder may be a receptacle that securely holds an end of the sample container via press-fit connection. In still other embodiments, the actuator may be configured to repeatedly agitate the sample container 90 to repeatedly change the position of the sample container when the sample container is held by the holder. For example, in some cases, the actuator may agitate the sample container without specifically inverting the sample container 90 through the cycles as described above.

|0034] Turning now to Figure 6, an alternative embodiment of the sample preparation module 120 is shown. For ease of description and illustration, the sample preparation module 120 shown in Figure 6 has the same reference signs to identify features that are common with the sample preparation module 20 shown in Figures 5A-5C, As illustrated best in Figure 6, the sample preparation module 120 has a holder 122 configured to hold the sample container 90 and an actuator 126 coupled to the holder 122 that moves the holder 122 into different positions in order invert the sample container 90. As shown, the holder 122 includes a post 123 and two grip members 124a and 124b between which the sample container 90 is held in place. The actuator 26 may be any device that can cause rotational motion of the holder 122 in response to command signals and/or instructions from the controller 80.

[0035] Continuing with Figure 6, the actuator 126 causes the holder 22 to repeatedly change a position of the sample container 90 a set number of times. For example, Figure 6 illustrates the holder 22 and sample container 90 in a first position PI, a second position P2, and optional to a third position P3. The actuator 126 causes the holder 122 to repeatedly cycle through the first position PI, the second position P2, and the third position P3 to invert the sample container 90. Progression of the sample container 90 through the first position PI, the second position P2, and the third position P3 and back to the first position PI constitutes one cycle. In certain causes, the third position P3 may be a release position as described above. The controller 80 actuates the actuator 126 in order to repeatedly change the position PI, P2 and P3 of the sample container 90 through one or more cycles (or one or more set number of times). Again, the number of cycles may be based on the type of sample container 90 and sample type. In one example, the controller 80 may be configured to invert the sample container 90 up to 10 or 20 cycles.

[0036] Continuing with Figure 6, inversion of the sample container 90 through the cycle (or cycles) causes the container axis C to rotate around a rotation axis R located proximate to an end of the post 23. The rotation axis R is substantially angularly offset with respect to the central axis C. As illustrated, the rotation axis R is substantially perpendicular to the central axis C of the sample container 90.

[0037] As illustrated Figures 5A-6, each holder 22, 122 holds a single sample container 90. In alternative embodiments, the holder 22, 122 may hold a plurality of sample containers 90. Likewise, the actuator would be configured to repeatedly change the position of the plurality of sample containers 90 held by the holder 22, 122. As shown, the holder is configured as a clamp. The holder 22, 122 can have other configurations designed to hold the sample container 90. In still other embodiments, the actuator may be configured to repeatedly agitate the sample container 90 to repeatedly change the position of the sample container when the sample container is held by the holder. For example, in some cases, the actuator may agitate the sample container without specifically inverting the sample container 90 through the cycles as described above.

[0038] The sample preparation modules 20, 120 is therefore designed to automatically invert sample containers immediately after collection, which is unlike conventional sample preparation devices. Rather, these steps are conventionally performed manually by the person collecting blood, which causes numerous opportunities for error. Automating the inversion can ensure that each sample container is inverted the correct number of times based on its type. For instance, inversion ca be performed in accordance the CLSI-GP44 standard. This automation also ensures that the speed and angle of inversion is not subject to differences in operator technique. Furthermore, the automated inversion also reduces the work and time required to collect blood.

[0039] When the required number of cycles (or agitation cycles) are complete, the controller 80 is further configured to cause the holder 22, 122 to release the sample container 90 into the staging module 40.

[0040] Referring back to Figures 3 and 5A-5C, the staging module 40 is configured to hold multiple sample containers 90 for a set period of time. Typically, the set period of time is sufficient to allow the blood in the sample container 90 to further clot, as further explained below. Referring to Figures 3 and 5C, the staging module includes a rack 42 that holds the sample container 90 when the sample container 90 is released from the holder 22. The rack 42 of the staging module includes a plurality of bays 44. Each bay 44 is configured to receive therein the lower end 92 of the sample container 90. As shown the plurality of bays are aligned along a curved axis T to define a circular shaped rack. In alternative embodiments, however, the rack may be linear such that the bays 44 are aligned along a linear axis (not shown). After the sample container 90 is placed in the rack 42, the controller 80 is also configured to monitor the time that the sample container 90 is held in the rack 42 of the staging module 40. The time the sample container is held in the rack 42 is measured from the time scanning module 60, which records the time the container is placed in the sample preparation device 10. Because the number of inversion cycles are known for each sample container 90, the time to complete the inversion cycles are also known, and the time the sample container 90 is in rack 42 can be monitored. In this regard, the controller 80 is configured to cause the release of the sample container 90 from the rack 42 of the staging module 40 when the set period of time has passed.

[0041] The set period of time monitored by the controller 80 in the staging module 40 is intended to match the approximate clotting time of a sample. The set period of time may differ based on the sample type, additive type, and environmental conditions. In one example, the set period of time may be up to 30 minutes. A typical staging time period may range between 20 minutes up to 60 minutes or more. One method of determining the set period of time is based on the CLST-GP44 standard mentioned above. For instance, according to the CLST-GP44 standard, the set period of time is intended to match the clotting time. For serum samples, the clotting time is 30-60 minutes at room temperature without an additive. In another example, for serum samples, the clotting time is 15-30 minutes when using glass or silica particles as a clot activator. In another example, for serum samples, the clotting time is 2-5 minutes when using snake venom or thrombin as a clot activator. The staging module 40 can release the sample container to one of the storage compartments 19a, 19b or to the centrifugation module 70. The controller 80 can operate the mechanized doors to direct the sample containers 90 to storage or to the centrifugation module 70. Whether or not a sample container 90 is stored or centrifuged is based on the sample type and the information encoded in the identifier 99 on the sample container 90, [0042] The staging module 40 advantageously holds sample containers (e.g. for serum) for the set period of time prior to centrifugation. For example, the wait time for serum specimens is conventionally tracked manually and is often inconsistent. By automating the wait period and tracking the wait time for each individual sample container, the staging module 40 can ensure that all sample containers have enough time to clot consistently. It also ensures that sample containers do not wait unnecessarily beyond their required clotting time.

[0043] Referring to Figures 1 and 2, the centrifugation module 70 is configured to centrifuge the sample containers 90. The centrifugation module 70 includes a rotor 72 in the device housing 12. The rotor 72 holds the sample containers 90. The centrifugation module 70 also includes a motor 74, which is communicatively coupled the controller 80. The motor 74 is a typical motor that causes rotation of the rotor 72. The controller 80 may utilize the centrifuge rotor 72 to index sample containers into the correct storage compartments. In conventional methods, sorting is either not done or is done manually . The sample preparation device 10 automates the process of sorting sample containers after collection. Unlike some conventional sorting devices, the sample preparation device may use the same rotor that is used for centrifugation to sort sample containers. In alternative embodiments, however, it is possible that separate rotors may be used for centrifugation and sorting. This, in turn, eliminates the need for a separate sorting mechanism. In one embodiment, the rotor 72 is configured for upright centrifugation. Either a single container can be centrifuged or multiple sample containers can be centrifuged. In still other embodiments, the centrifuge could be a swing-bucket centrifuge or a fixed-angle centrifuge. It could be a refrigerated centrifuge or a room temperature centrifuge. However, other centrifugation methods may be employed as needed.

[0044] Another embodiment of the present disclosure is a method for preparing a biological sample. In one example, the method uses the sample preparation device 10 (or device 120) described above to prepare and stabilize a blood sample close to or immediately following collectio of the blood sample. Typically, a collection technician will use a collection device having a lancet to extract blood from the patient. The collection device may be used to place the blood sample into the desired sample container (e.g. sample container 90 above). In such an example, a micro-sample of blood is collected. In other embodiments, a needle may be used to collect larger amounts of blood. Thus, the device 10 and method described herein may be use for micro-samples and larger blood samples. The collection technician may access the sample preparation module 20 and place one or two containers (or more) in the holder 22 of the sample preparation module 20. Here, the method includes holding the sample container with a holder 22 of a sample preparation module 20.

[0045] At this point, a scanning module 60 may scan an identifier 99 on the sample container 90. As noted above, the identifier 99 contains information indicative of the type of sample container 90. The scanning module 60 transmits the time that the sample container 90 is gripped and information, such as sample ID, to the controller 80. At this point, the controller may determine which sample container 90 requires centrifugal! on. This determination may be based on the sample ID or other information encoded in the identifier 99.

[0046] Next, the method includes actuating the holder 22 while holding the sample container 90 to repeatedly change a position of the sample container 90. In one example, actuating the holder includes repeatedly inverting the sample container to repeatedly change the position of the sample container for one or more cycles. For instance, actuating the holder includes repeatedly inverting the sample container to repeatedly change the position of the sample container up to about 10 cycles (or times). More or less cycles may be used depending on the sample ID and intended test. In alternative embodiments, actuating the holder includes repeatedly agitating the sample container 90 to repeatedly change the position of the sample container. In still other embodiments, the method may also include, causing, via the controller 80, the actuator 26 to actuate the holder 22 based at least on a type of the sample container 90 held by the holder 22. The sample preparation device 10 therefore utilizes automated inversion, thereby removing errors associated with manual inversion. Furthermore, because the sample preparation device 10 has scanned the sample container's 90 identifier 99, the controller and related software knows what type of container it is and whether it needs to be inverted.

[0047] After inversion of the sample containers 90 is complete, the sample preparation module 20 causes the holder 22 to release the sample container 90 into the staging module 40 to initiate a clotting queue. The sample containers 90 may be staged in the staging module for a time sufficient to cause further clotting of the blood in the sample containers. In one example, a particular sample container 90 may be staged in the staging module for a set period of time (or staging time period). A typical staging time period may range between 20 minutes up to 60 minutes or more. In one example, the set period of time may be up to 30 minutes. As discussed above, according to the CLSI-GP44 standard, the set period of time is intended to match the clotting time. For serum samples, the clotting time is 30-60 minutes at room temperature without an additive. In another example, for serum samples, the clotting time is 15-30 minutes when using glass or silica particles as a clot activator. In another example, for seram samples, the clotting time is 2-5 minutes when using snake venom or thrombin as a clot activator. The staging module 40 can release the sample container to one of the storage compartments 19a, 19b or to the centrifugation module 70. The controller 80 can operate the mechanized doors to direct the sample containers 90 to storage or to the centrifugation module 70. The controller monitors the time that the sample container 90 is held by a rack 42 of the staging module 40.

[0048] The method includes releasing the sample container 90 from the rack 42 of the s taging module 40 when the set period of time has passed. Because the sample preparation device 10 has scanned the container's identifier 99, the controller also knows whether the sample container is a serum sample and whether it needs to wait prior to centrifugation. In one example, the controller 80 determines which sample container should be centrifuged. In response to that determination, the controller 80 causes the staging module 40 to route the sample container 90 to the centrifugation module 70. Then, the centrifugation module 70 centrifuges the sample held within the sample container 90. Because the sample preparation device 10 has scanned the container's identifier 99, the controller also knows the approximate force and time the sample need to be centrifuged. The force and time may be different depending on the type of the sample container 90. The device may bypass centrifugation altogether if it determines that the sample container does not require centrifugation.

[0049] Thereafter, the sample containers are routed to the appropriate storage compartments. Alternatively, after staging on the staging module is complete, for those samples where centrifugation is not required, the controller 80 causes the staging module 40 to route the sample container 90 to one or more storage compartments. The information obtained from the scanning module is used by the controller to determine where the sample container should be stored. The controller 80 can use the centrifuge rotor to position the sample container 90 above the correct storage compartment and drop the sample container in the compartment. The sample preparation device 10 may store sample containers in the compartments with a specific orientation or organization. For example, it could store sample containers upright in a rack or it could store containers horizontally in a magazine. The controller 80 is configured to manage the index positions and elapsed time a container 90 is in the staging module 40. Once the sample containers 90 are deposited into the compartments, the user may retrieve the sample containers for the required testing. [0050] While the present disclosure is described herein using a limited number of embodiments, these specific embodiments are not intended to limit the scope of the disclosure as otherwise described and claimed herein. Modification and variations from the described embodiments exist. It should be understood that the invention is not limited to the specific details set forth in the examples.