Creatinine clearance = (UV / P) ml per minute, where:
This formula shows SI units.
Alternatively, if urinary collection is difficult, the Cockcroft-Gault equation aims to predict creatinine clearance from knowledge of serum creatinine, age and weight:
For women multiply the result of calculation by 0.85.
The second calculation is unreliable if the patient has unstable renal function, is very obese, or is oedematous.
Reference:
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