Osmolality, Urine

Abbrev Code:UOSM   
Order Code:LAB420Order Name:Osmolality Urine
Methodology:Micro-osmometry by freezing point depression
CPT Codes: 83935 x1
Turnaround Time:Performed and reported 24 hours/day.
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Urine Collection Procedure

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:24 hours at room temperature or refrigerated.
Test Performed at or Referral Lab Chemistry  (CSC Mpls, Range, Southdale, UMMC East Bank, UMMC/UMMCH-West Bank)


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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