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Definition of Plasma osmolarity

Plasma osmolarity: The osmolarity of blood plasma, which is a measure of the hydration status. The plasma osmolarity is sensitive to changes in hydration status during dehydration and rehydration. The normal plasma osmolarity is in the range of 280-300 mOs/kg. This may vary somewhat from laboratory to laboratory.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=33419
Last Editorial Review: 6/14/2012

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