Nephrology · ICU and Critical Care
Free Water Clearance calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
mL/min
Allowed range: 0.01–50 mL/min
Quick picks
mOsm/kg
Allowed range: 50–1200 mOsm/kg
Quick picks
mOsm/kg
Allowed range: 250–350 mOsm/kg
Quick picks
Result
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Clinical inputs
- Urine flow (mL/min)Accepted range: 0.01 to 50
- Urine osmolality (mOsm/kg)Accepted range: 50 to 1200
- Serum osmolality (mOsm/kg)Accepted range: 250 to 350
Primary source
Lord RC. Osmosis, osmometry, and osmoregulation. Postgrad Med J. 1999;75:67-73. DOI: 10.1136/pgmj.75.880.67. PMID: 10448464. Scope: free-water clearance = urine flow rate × (1 − Uosm / Posm); positive values indicate free-water excretion and negative values indicate free-water reabsorption. (1999)
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