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Test Code UOSMO Osmolality, Urine

Performing Laboratory

Hunterdon Medical Center Laboratory

Useful For

  • Evaluation of the body's water balance and its ability to produce and concentrate urine.
  • Investigate low sodium (hyponatremia)
  • Detect the presence of toxins in the body
  • Monitor patients undergoing osmotically active drug therapies, e.g.mannitol.

Specimen Required

Container/Tube Plastic Urine Contaier
Specimen Volume 5.0mL
Minimum  Volume 2.0mL

Specimen Type

Urine, random

Specimen Transport Temperature

Ambient

Specimen Stability

 Must be received < 24 hours.

Reject Specimen Due To

  • Specimen > 24 hours old.
  • Container Leakage
  • Contamination

Day(s) Test Set up

Monday through Sunday

Available STAT

Reference Values

 Specimen  Range
 Random  50-1200 mosm/kg
 After 12 hour fluid restriction  >850 mosm/kg

Methodology

Freezing Point Depression

CPT Code

83935

Loinc Code

2695-5