OSMOLALITY, SERUM

Test Code

OSM (OE & LAB)

CPT Codes
83930

Preferred Specimen

Gold Tube (SST)

Patient Preparation
None

Minimum Volume

1 mL

Other Acceptable Specimens

Green Tube (Lithium Heparin)

Instructions

Centrifuge for complete separation of serum or plasma from red cells.

Transport Container

GOLD Tube

Transport Temperature

Room temperature

Specimen Stability

15-30°C up to 3 hours
2-8°C up to 3 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Hemolyzed
Lipemic

Methodology
Freezing point depression

Setup Schedule

DAILY, as received

Report Available

STAT: <60 minutes
Routine: <4 hours

Reference Range

Male/Female All Ages: Normal Range: 285-300 mOsm/kg

Clinical Significance

Osmolality is a test that measures the concentration of all chemical particles found in the fluid part of blood. The test helps check body's water imbalance which may be caused due to low sodium (hyponatremia) or water loss, poisoning from harmful substances such as ethanol, methanol, or ethylene glycol, or the kidney problem.

Performing Laboratory
Mount Sinai Hospital
Holy Cross 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.