PURPOSE: To give excellent blood separating ability, floating property and appropriate thixotropic property by using styrene oligomer having specific viscosity as base oil component and specific organic gel agent as thixotropy adjusting agent.
CONSTITUTION: Viscosity of styrene oligomer used as base oil component is 1000 to 1000000cp, preferably 5000 to 500000cp at 25°C. Styrene oligomer has little interaction with blood and little adsorption to chemical used for inspection. When viscosity of styrene oligomer exceeds the range, floating property drops. Condensate of sorbitol and benzealdehyde derivative is used as organic gel agent to be added as thixotropy adjusting agent. A blood separating tube comprises approximately 5 to 40% of blood separating composition with respect to a volume of a tube injected into the tube having a bottom with an opening oppositely to the bottom, wherein a test tube or the like will do.
SATO KIYOSHI
IZUMI TOSHIHIKO
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