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HelpTest Code 291 Osmolality, Serum
Additional Codes
ALAB: OSMOS
PowerChart: Osmolality Serum
MA Cerner: Osmolality Level
Test Method
Freezing Point Osmometry; Osmo 1, Advanced Instruments
Specimen Requirement
0.5 mL serum is required. Serum gel tubes are acceptable.
Specimen integrity: icterus, lipemia, and hemolysis are acceptable
with serum samples.
Additional Specimen Collection Information
Collect blood in a red-top tube.
Serum and urine specimens should be tested as soon as possible after collection in order to obtain accurate osmolality results. It is recommended that specimens are tested within 24 hours. Specimens can be refrigerated at 2-8 °C for up to 7 days.
Performance
Testing is performed Monday through Sunday.
Typically completed within 4 hours after the specimen arrives at the testing site.
Reference Values
275-295 mOsm/kg
CPT Code Information
83930 Chemistry: Osmolality; blood
Useful For
Evaluating acutely ill or comatose patients.
LOINC Code Information
2692-2 Osmolality Of Serum Or Plasma