Osmolality, Serum

Test performed at York Hospital Laboratory.

Test Code

CPT Codes

Preferred Specimen
1mL Serum

Minimum Volume
0.5mL Serum

Transport Temperature
Room temperature

Specimen Stability
  • Room temperature: 4 days
  • Refrigerated: 5 days
  • Frozen: 14 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross icteric; gross hemolysis; gross lipemic; heparinized plasma

Freezing point depression

Report Available
Daily Report – same day

Reference Range
278-305 mOsm/kg

Clinical Significance
For the evaluation of fluid and electrolyte balance

Performing Laboratory
York Hospital

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.