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HelpTest Code OSMU Osmolality, urine
Laboratory Code
LAB420
Specimen Requirements
Specimen Type: Urine
Container/Tube: Urine cup
Volume: 100.0 mL
Minimum Volume: 20.0 mL urine
Collection Instructions: Collect mid-stream urine in preservative-free urine container.
Specimen Stability
| Specimen Type | Urine |
|---|---|
| Ambient | 36 hours |
| Refrigerate | 36 hours |
| Frozen | 6 months |
Methodology
Freezing-point Depression
Days and Times Performed
24 hrs, TAT 1 day
Specimen Condition
| Haemolysis | Not available |
|---|---|
| Icterus | Not available |
| Lipaemia | Not available |
| Others | Not available |
Reference Interval
100 – 1200 mOsm/kg
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Assessing the concentrating and diluting ability of the kidney.
Service Code
31308
LOINC Code Information
2695-5
Update
Last updated 11/03/2025