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Test ID: Osmolality Urine
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Osmolality Urine
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Useful For
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Assessment of body fluid and electrolyte balance and concentrating capability of the kidneys.
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Method name and description
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Freezing Point Depression Osmometry
Osmometry measures the total molar concentration of dissolved solids in any solution. The freezing point of a solution is depressed in direct relation to the amount of solute in solution.
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Clinical information
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Osmolality tests measure the amount of certain substances in blood, urine, or stool. These include glucose (sugar), urea (a waste product made in the liver), and several electrolytes, such as sodium, potassium, and chloride. Electrolytes are electrically charged minerals. They help control the amount of fluids in your body. The test can show whether you have an unhealthy balance of fluids in the body. An unhealthy fluid balance can be caused by many different conditions. These include excess salt intake, kidney disease,heart disease and some types of poisoning. The osmolality urine test measures the concentration of chemicals in urine.
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Specimen type / Specimen volume / Specimen container
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Specimen: Random Urine (Random)
Minimum volume : 5 mL freshly voided urine in clean container or aliquoted tube.
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Collection instructions / Special Precautions / Timing of collection
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Collect urine sample by "clean catch method".
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Storage and transport instructions
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Storage: 2 hours at room temperature
7 days at 2 – 8°C;
Transport: 2-25°C
(Urine specimens is recommended to be stored at 2‑8°C when delay in transport.)
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Specimen Rejection Criteria
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Leaking specimen, contaminated sample, adulterated sample.
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Biological reference intervals and clinical decision values
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0 to 11 months: 50 - 750 mOsml/kg
11 months to 150 years: 150 – 1150 mOsml/kg
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Turnaround time / Days and times test performed / Specimen retention time
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Daily (24/7)
Turn-around time:
STAT: 1 hour
Routine: One working day
Specimen Retention: 4 days
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