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HelpTest Code OSMOU Osmolality Urine
EHR Test Codes
| Test Code | Test Name | |
| Atlas | OSMOU | Osmolality, Urine |
| Cerner | Osmolality Urine |
Specimen Requirements
Preparation of Patient:
None.
Container Type:
Sterile Specimen Cup
Specimen Type:
Urine
Specimen Volume:
2 mL Urine minimum .6 mL
Specimen Handling/Transport:
Transport ambient room temperature or refrigerated.
Specimen Stability/Storage:
1 day ambient room temperature
2 days refrigerated 2-8°C
Specimen Rejection:
Frozen Samples
Contaminated with feces
Performing Laboratory
Munson Medical Center Laboratories
Chemistry Department
Priority, Frequency, & Turnaround
Priority:
Non-Emergent
Frequency:
24 hours 7 days a week
Turnaround:
0 - 1 days
Methodology
Freezing Point Depression
Reporting
Reference Range:
0 - 11 months 50 -750 mOsm/kg H2O
> 12 months 150 - 1150 mOsm/kg H2O
Critical Decision:
None
Clinical Significance
Osmolality is used in assessing the concentrating ability of the kidney. In normal individuals on an average intake, the ratio of urine osmolality to serum osmolality is between 1.0 and 3.0. In patients with renal tubular deficiency the ratio will be below that observed in normal individuals. In polyuria of diabetes insipidus, the ratio will be between 0.2 and 0.7. It is also used to evaluate mannitol treatment for head injury patients. Mannitol will help regulate intracranial pressure.
CPT Code(s)
83935