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Order Code LAB1124 Osmolality, Urine

Important Note

This test is currently down and is being routed to Mayo Clinic Laboratories.

Useful For

Assist in establishing the proper diagnoses and treatments for patients with disorders involving water and electrolyte imbalances.

Specimen Requirements

Specimen Type: Urine

Collection Container: Sterile urine cup

Transport Container: 5 mL aliquot tube

Specimen Volume: 2 mL

Minimum Volume: 1 mL

Specimen Stability

Specimen Type Temperature Stability             
Urine Ambient N/A
  Refrigerated (preferred) 24 hours
  Frozen 1 week

Reference Values

  • Random: 50 - 1400 mOsm/kg, depending on fluid intake
  • Random: > 850 mOsm/kg after 12 hour fluid restriction
  • 24 hour: 300 - 900 mOsm/kg

Day(s) Test Set Up

Monday through Sunday

Performing Laboratory

Ridgeview Medical Center Laboratory

Methodology

Freezing Point Depression

Test Classification and CPT Coding

83935