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Test Code OSMO Osmolality, LAB107


Freezing Point Depression

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

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding


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.