In the physiology of the kidney, free water clearance (CH2O) is the volume of blood plasma that is cleared of solute-free water per unit time. An example of its use is in the determination of an individual`s state of hydration. Conceptually, free water clearance should be thought of relative to the production of isoosmotic urine, which would be e....
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http://en.wikipedia.org/wiki/Free_water_clearance
The amount of water excreted in the urine beyond that which would accompany the excreted solutes if the urine were isosmotic with plasma; it represents the loss of body water in excess of solute tending to raise body osmolality and making urine hyposmotic. Unlike other clearance's, it is calculated by subtracting the osmolal clearance from the actu...
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http://www.encyclo.co.uk/local/20973
Type: Term Definitions: 1. the amount of water excreted in the urine beyond that which would accompany the excreted solutes if the urine were isosmotic with plasma; it represents the loss of body water in excess of solute tending to raise body osmolality and making urine hyposmotic. Unlike other clearances, it is calculated by subtracting the osmol...
Found on
http://www.medilexicon.com/medicaldictionary.php?t=18090
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