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HelpTest 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
<!-- Rejection-->
| Hemolysis Threshold | No interference |
| Icterus Threshold | Not listed |
| Lipemia Threshold | Not listed |
| Other | QNS, contaminated, improperly Labeled, improper specimen type |
Specimen Stability
<!-- Stability -->
| Ambient | 2 hours |
| Refrigerated (4°C to 8°C) | 24 hours |
| Frozen(-40°C to 0°C) | 1 week |
Performance Information
<!-- Performance information -->
| 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
83935