Plain red top or SST tube.
Onsite [NJH]: Transport to lab within 1 hour.
Offsite: Separate serum from cells within 2 hours by centrifuge and aliquot into a labeled polypropylene or similar plastic tube.
Preferred volume: 1.5 mL serum
Minimum Volume: 0.1 mL serum
Offsite: Frozen. Send serum Priority Overnight via FedEx and in a well insulated container on dry ice.
Stability after cell separation:
4 days at RT (15-25°C)
7 days refrigerated at 2-8°C
All Male: 45-182 ug/dL
All Female: 28-170 ug/dL