Random glucose can be collected any time of day without regard to time of last meal. Collect one 7.5 mL serum separator tube (SST), one 4 mL green top heparanized plasma separator tube (PST), or one 2 mL grey top tube (potassium oxalate/sodium fluoride) tube.
Centrifuge and separate serum or plasma from cells immediately. Specimens drawn in serum or plasma separator tubes can be transported in the original tube after centrifugation. Refrigerate for transport.
24 hours ambient, 6 days refrigerated, or indefinitely frozen.