Ambient - 2 hours; Refrigerated - Unacceptable; Frozen -20oC – 2 weeks, at -70oC - 6 months
If the testing is not completed within 2 hours, platelet-poor plasma should be removed without disturbing the sedimented cells (buff-coat) and frozen at -20oC or below for short-term storage (up to 2 weeks), or -70oC for 6 months