Abstract: The blood collector of the present invention is a one-piece molded container consisting of three basic components - a) a base, b) a top, and c) a cap, with connecting straps. The top of the device is lockable to the base by male and female interlocking snap-fit rings, to prevent the top of the collector from "popping" off the base when squeezing the collector to produce suction for the withdrawal of blood from an animal. The tethered cap produces a self-contained unit for transporting blood collected in the field to a laboratory for centrifuging and testing. After centrifuging, by removing the top from the base there is easy accessibility to the plasma or serum.