Serum separator tube (sst) does not have any additive but a clot activator that will separate blood from the serum by centrifugation. How long should you let blood drawn in a red or sst tube clot before centrifugation? Speckled Tube In 2021 Phlebotomy Order Of Draw Tube Can the sst timer be used to replace other brands of timers? How long does sst tube last . Allow blood to clot for 30 minutes in a vertical position and centrifuge within 2 hours. Serum separator tube (sst™) 1. However, most samples in this category show almost insignificant corrosion after 1000 hours; As long as the valves being used run on standard 24 vac than you can replace your current timer with an sst timer. 3 years up to 150 years: Q.does the sst have a battery back up in case of power failure? Let the blood sit for 30 minutes to one hour at room temperature to clot before spinning and separating. You need at least 2ml for each sst tube test. Tubes should be at least 50% full. Stan...