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Test Code U24 Osmo Urine 24 Hour, Osmolality

Patient Preparation

No special patient preparation required

Special Collection Instructions

Specimen must be received with the following information included:

  • Total volume of collection
  • Start date and time
  • Stop date and time

Collection Method

24 hour urine collection

Minimum Volume

0.04 mL

Container

24 hour urine container

Preferred Specimen

24 hour urine container

Acceptable Specimens

24 hour urine container

Reference or Target Ranges

300 – 900 mOsm/kg

Reportable Units

mOsm/kg

Critical Value

Not defined for this assay

Reasons for Rejection

 


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Hemolysis Threshold No interference
Icterus Threshold Not listed
Lipemia Threshold Not listed
Other QNS, contaminated, improperly Labeled, improper specimen type, collection information not provided

Specimen Stability

 


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Ambient 8 hours
Refrigerated (4°C to 8°C) 24 hours
Frozen(-40°C to 0°C) 1 week

Performance Information

 


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Days and Time Performed 24/7
Expected Turn Around Time Stat: 1 hour
Routine: 4 hours
Stat Availabilty Yes
Performing Bench UH Chemistry
Methodology/Method Description Advanced Instruments Micro-Osmometer –  freezing-point depression 

Additional Information/Important Notes

In vivo substances such as ethanol, isopropanol, methanol, acetone, and ethylene glycol will increase osmolality readings. The difference between estimated (calculated) and observed (measured) osmolality is clinically useful information.

CPT Codes

81050;83935