Test Overview
Test Methodology
Freezing Point
Test Usage
To aid in evaluation of water balance and kidney function.
Reference Range*
300 - 1300 mOsm/kg for random specimens
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Test Details
Days Test Performed
Daily, 24 hours
Analytic Time
2 hours
Soft Order Code
OSMOU
MiChart Code
Osmolality, Urine
Synonyms
OSMOLALITY, URINE
OSMOU
Laboratory
Chemical Pathology
STAT Availability
STAT requests for this test will be performed on a STAT basis (supervisory staff approval is not required).
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Find a Requisition
All specimens should be accompanied by a requisition.
Submitting Specimens
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Order Kits and Supplies
MLabs provides all the supplies necessary for the collection of specimens.
Test FAQ
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Specimen Requirements
Offsite Collection Instructions
Collect 24 hour urine specimen with no preservative. Aliquot 2 mL into a plastic urine container and refrigerate. Record total 24 hour urine volume and collection dates/times on request form. Random urine is also acceptable.
Rejection Criteria
Specimens collected with Acid Preservative are not acceptable.
Normal Volume
2 mL aliquot of random or 24 hour urine collection
Minimum Volume
0.5 mL aliquot of random or 24 hour urine collection
Billing Information
Fee Codes
CPT Code
83935
LOINC
2695-5
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