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Osmolality, Urine

Test Name:Osmolality, Urine
Epic Order Code:LAB420  
CPT Code:83935  
Specimen(s) Type:Urine  
Acceptable Container(s):Sterile container
Testing Schedule:24 hrs/day, 7 days/week
Turn Around Time:STAT: 1 hour  
 Routine: 2 hours  
Collection Information:No special patient preparation is required. Obtain specimen by standard collection procedures.
Transport Information:Deliver to lab immediately. All specimens must be signed into the laboratory.
Reference Clients:If unable to deliver to the lab within 1 hour, store and transport at 2-8° C. Specimen must be received in the lab within 24 hours.
Causes for Rejection:Improperly labeled, incorrect container, contaminated, insufficient quantity, incorrect/delay in transport.
Reference Range:50 - 1200 mOsm/kg; random sample, depending on fluid intake
 24 hr urine with average fluid intake: 300 - 900 mOsm/kg
 Random urine after 12 hr fluid restriction: > 850 mOsm/kg
Additional Information:Additives such as anticoagulants from collection tubes may contribute significantly to the measured osmolality.