Collect: Serum separator tube or plasma separator tube.
Specimen Preparation: Separate serum or plasma from cells within 2 hours of collection. Transfer 0.5 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.5 mL)
Storage/Transport Temperature: Refrigerated.
Stability (collection to initiation of testing): After separation from cells: Ambient: 24 hours; Refrigerated: 1 week; Frozen: 6 months
Reference Interval:
0-16 years: 271-296 mOsm/kg 17 years and older: 280-303 mOsm/kg