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  • Osmolality, Urine

    Test Name:Osmolality, Urine
    Epic Order Code:LAB420  
    CPT Code:83935  
    Specimen(s) Type:Urine  
    Acceptable Container(s):
    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.