Patient Prep: Collect 1 timed specimen at 0 minutes.
Collect: Plasma separator tube or serum separator tube.
Specimen Preparation: Allow specimen to clot completely at room temperature. Separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.4 mL) Specimen must be labeled with time drawn.
Storage/Transport Temperature: Refrigerated.
Stability (collection to initiation of testing): After separation from cells: Ambient: 1 week; Refrigerated: 1 week; Frozen: 3 months
Reference Interval:
By report
Interpretive Data:
Effect of normal clinical variation: 0800 hours: 6-23 µg/dL 2000 hours: < 9 µg/dL
