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Clinical Pathology Laboratory - Available Test
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Urine Osmolality
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| Urine osmolality is measured by freezing point depression in our
laboratory. Osmolality is affected by the number of osmotically active
particles in solution and is unaffected by their molecular weight
and size. For this reason, osmolality is superior to specific gravity,
which is affected by particle weight and size. Isosthenuric urine
has an osmolality similar to plasma, approximately 300 to 320 mOsm/kg.
Urine osmolality is useful for evaluating urine concentrating ability,
for example in water deprivation tests, and is more accurate than
measurement of urine specific gravity in this regard. |
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