It is intended for taking micro-samples of blood serum and other biological fluids, storing them and transporting them to a medical institution. The tube is microcentrifuge (Eppendorf) without divisions, with a colored screw cap on a loop. The test tube has a ribbed surface in the neck area and a rubber O-ring. The test tube is made of polypropylene. It is autoclaved at a temperature of +121 ° C.