BD Vacutainer Rapid Serum Tubes (RST) Blood Collection Tubes 8 mL 13mm x 100mm, 100/boxBD 368774 Vacutainer Rapid Serum Tubes (RST) Blood Collection Tubes 8 mL 13mm x 100mm. The BD Vacutainer Rapid Serum Tube (RST) is a new and innovative product from BD that will provide the laboratory with a faster serum sample whena rapid turn around is required. The BD RST provides a clotted sample within 5 minutes of blood collection. The tube contains a thrombin based medical clotting agent and Gel. With only a five minute clot time and minimal