Osmolality, Urine
| Abbrev Code: | UOSM | ||
| Order Code: | LAB420 | Order Name: | Osmolality Urine |
| Methodology: | Micro-osmometry by freezing point depression | ||
| CPT Codes: | 83935 x1 | ||
| Turnaround Time: | Performed and reported 24 hours/day. | ||
| Associated Links: | |||
Collection Instructions
| Specimen: | Urine, random or timed collection |
| Optimal Volume: | Submit entire collection; analysis requires 0.1 mL |
| Container: | Plastic leakproof container, sterile |
| Causes for Rejection: | Frozen samples, samples greater than 24 hours old (room temperature or refrigerated). |
Processing and Shipping
| Specimen Processing: | Mix collection well before aliquot is taken. Aliquot 1 mL, 0.1 mL minimum. Store in refrigerator. |
| Shipping Instructions: | Ship at refrigerated temperature. |
| Stability: | Stability: 24 hours at room temperature or refrigerated. |
| Test Performed at or Referral Lab | Chemistry (Range, UMMC-East Bank, Southdale, UMMC/UMMCH-West Bank, M Health Clinic and Surgery Center, St. Joseph's) |
Interpretive
| Reference Range: | Depends on patient's hydration status and renal function. Neonates: 75-300 mmol/kg; 2 years and older, random specimens: 100-1200 mmol/kg; greater than 850 mmol/kg after 12 hour fluid restriction; urine/serum osmolality ratio: 2 years and older: 1.0-3.0; 3.0-4.7 after 12 hour fluid restriction |
| Use: | Aid in diagnosis of acute renal failure, hyponatremia, hypernatremia; renal function; support diagnosis of SIADH, diabetes insipidus. |
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