Osmolality, Urine (OSMO UR)
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| Synonyms:
| None listed |
| Specimen: | Urine; random 5 mL in a urine container. |
| Volume: | 5 mL |
| Minimum Volume: | 1 mL |
| Collection: | Refrigerate at 2-8°C for 24 hours.
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| Rejection Criteria: | Improper labeling. |
| Reference Range: | 50-1200 mosm/L |
| Methodology: | Fiske Osmometer |
| Test Use: | Evaluate concentrating ability of the kidneys (eg, in acute and chronic renal failure); evaluate electrolyte and water balance; used for work-up in renal disease, evaluate dehydration and amyloidosis. |
| Additional Information: | Osmolality is a better measurement than specific gravity. Osmolality is a measure of renal tubular concentration depending on the state of hydration. Low birthweight infants have been reported to have increased serum osmolality with normal urine osmolal |
| Testing Includes: | |
| Testing Facility: | AnMed Laboratory |