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Test Code U Osmo Urine, Osmolality

Aliases

Random urine osmolality

Patient Preparation

No special patient preparation required

Collection Method

Sterile urine collection

Minimum Volume

0.04 mL

Container

Sterile Urine Cup

Preferred Specimen

Sterile Urine Cup

Acceptable Specimens

Urine

Reference or Target Ranges

Random urine (depending on fluid intake) 50 – 1400 mOsm/kg
Random urine (after 12 hour fluid restriction) >850 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

Specimen Stability



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Ambient
 2 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, WCH Chemistry
Methodology/Method Description
 Advanced Instruments Micro-Osmometer Model 3320 – Uses the technique of freezing-point depression to measure osmolality

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

83935