Osmolality, Blood and Urine
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To assess fluid and electrolyte balance related to hydration, acid-base balance, and screening for toxins.
Serum collected in a gold-, red-, or red/gray-top tube; urine from an unpreserved random specimen collected in a clean plastic collection container.
(Method: Freezing point depression)
|Conventional Units||SI Units (Conventional Units × 1)|
|Serum||275–295 mOsm/kg||275–295 mmol/kg|
|Urine (random)||50–1200 mOsm/kg||50–1200 mmol/kg|
|Urine (24-hr collection)|
|Newborn||75–300 mOsm/kg||75–300 mmol/kg|
|Children and adults||250–900 mOsm/kg||250–900 mmol/kg|