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 mL serum
Minimum volume: 150 mcL serum
Offsite: Send frozen serum Priority Overnight via FedEx and in a well insulated container on dry ice.
Stability after cell separation: 8 hours ambient, 48 hours refrigerated, once frozen, only thaw once.
Monday - Friday
Ion Selective Electrode
4 hour routine, 1 hour STAT
Ion Selective Electrode (Calcium, serum)
1 month - 23 months
2 years - 15 years