Vacutainer Rapid Serum Tubes is a serum blood collection tube that clots in only 5 minutes, instead of the 30 minutes required by standard serum gel tubes, and can be centrifuged in as little as 3 minutes. Providing asignificant advantage when timely decisions are necessary, such as in emergency room settings, the  Vacutainer RST offers you the speed of plasma with the quality of serum.