Immediatley following collection, mix sample by inverting 8 - 10 times to prevent clotting
If unable to spin within 15 minutes of collection specimen must be placed on ice until centrifugation occurs and plasma is separated from the cells.
Refrigerated - 3 days
Refrigerated (preferred) - 14 days
Ambient - 8 hours
0.50 - 2.2 mmol/L
(First time in 24 hour)