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HelpTest Code OSMO Osmolality, LAB107
Performing Laboratory
St. Luke's Hospital Cedar Rapids
Specimen Requirements
Container/Tube:
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
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.
Methodology
Freezing Point Depression
Test Classification and CPT Coding
83930
Report Available
1 hour upon receipt.