Collect: Serum separator tube or plasma preparation tube. Also acceptable: Plasma collected in green (lithium heparin).
Specimen Preparation: Allow specimen to clot completely at room temperature. Separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 0.5 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.2 mL)
Storage/Transport Temperature: Frozen.
Unacceptable Conditions: EDTA plasma or hemolyzed specimens.
Stability (collection to initiation of testing): After separation from cells: Ambient: 8 hours; Refrigerated: 72 hours; Frozen: 1 month
Reference Interval:
6 months-6 years: 18-37 mg/dL 7-17 years: 20-43 mg/dL 18 years and older: 17-54 mg/dL