Blood test kit and blood analysis method

A blood test kit for analyzing a concentration of a target component in a blood sample using a normal component which is homeostatically present in blood, the kit comprising:

• a diluent solution for diluting the blood sample;
• a first storing instrument for storing the diluent solution;
• a separation instrument for separating and recovering blood plasma from the blood sample diluted with the diluent solution;
• a holding instrument for holding the separation instrument;
• a second storing instrument for storing the recovered blood plasma;
• and
• a sealing instrument for keeping the stored blood plasma within the second storing instrument,
• wherein the separation instrument is composed of glass fibers coated with a resin,
• the resin is selected from the group consisting of urethane resins, polyvinyl alcohol resins, and epoxy resins,
• a coating amount of the resin is 1% to 10% by mass with respect to a mass of the glass fibers, and
• the resin does not accumulate between the glass fibers so that the glass fibers are coated without lowering a void volume.