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Test Code OSMO Osmolality, LAB107

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Gold-top serum gel tube or plain, red-top tube

Acceptable: Green-top( sodium or lithium heparin) tube (only if it is the only sample available)
Specimen Volume: 50 µL of serum


Reference Values

280-300 mOsm/kg

Useful For

Determination of serum and urine osmolality can be useful in the assessment of electrolyte and acid-base disorders, in the detection of unmeasured substances in the serum, and in the assessment of renal concentrating ability.

Day(s) Test Set Up

Monday through Sunday


Freezing Point Depression

Test Classification and CPT Coding