Electrolyte free water clearance (EFWC) Calculator

Medical Calculator – SonDoctor.com

Electrolyte free water clearance (EFWC) Calculator

EFWC = UV x (1-((Urine Na + Urine K) / Plasma Na))
UV : Urine flow rate (L/day) * If the 24-hour urine volume is not entered, only a POSITIVE or NEGATIVE result will be provided.

Urine Na (mEq/L):
Urine K (mEq/L):
Plasma Na (mEq/L):
[Optional] 24hr Urine Volume (L/day):

EFWC POSITIVE: Reflects free water excretion, typically seen in hypotonic urine or water diuresis.
EFWC NEGATIVE: Reflects free water retention, as in cases of impaired water excretion or ADH effect.

Nephrology

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