Sign in →

Test Code OSMO Osmolality, Serum LAB107

Test Method

Freezing Point Osmometry; Osmo 1, Advanced Instruments

Specimen Requirement

0.5 mL serum is required. Serum gel tubes are acceptable.

Reference Values

275-295 mOsm/kg


Testing is performed Monday through Sunday.

Typically completed within 4 hours after the specimen
arrives at the testing site.

CPT Code Information

83930 Chemistry: Osmolality; blood

LOINC Code Information

2692-2 Osmolality Of Serum Or Plasma

Useful For

Evaluating acutely ill or comatose patients.

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.