Osmolality, serum

Test Code: TD_2133

CPT Code(s): 83930

$24

Test Details

Alternative Name(s)

Serum osmolality

Test Includes

Osmolality, serum

Methodology

Freezing point depression

Rejection Criteria

Gross hemolysis

Reference Range(s)

Age 17 years and older: 280-303 MOSM/KG

Specimen Requirements

Preferred Specimen

Serum separator tube

Minimum Volume

0.5 mL serum

Sample Stability

2 days room temperature
1 week refrigerated
Unacceptable frozen

Transport Temperature

Refrigerated

Collection Instructions

Allow SST to clot in an upright position for at least 30 minutes, then centrifuge sample within 2 hours of collection. Refrigerate.

Alternative Specimen

1 mL serum from a plain red top tube. Allow sample to clot in an upright position for at least 60 minutes, then centrifuge sample and transfer serum to a plastic transport tube within 2 hours of collection. Clearly label tube as serum from a plain red top tube. Refrigerate.