free water clearance
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Introduction
The volume of water per minute that would need to be excreted to make the urine isotonic (with plasma).
C(H20) = (V - (Uosm x V/Posm))/ (24 hours x 60 minutes/hour)
where:
- C(H20) = free water clearance
- V = 24 hour urine volume
- Uosm = urine osmolality
- Posm = plasma osmolality
More general terms
Component of
References
- ↑ Henry's Clinical Diagnosis & Management by Laboratory Methods, 21st edition, McPherson RA & Pincus MR (es), W.B. Saunders Co., Philadelphia, PA. 2007