Webster et al reported a simple equation for estimating urinary flow rate based on the urine concentration of creatinine as well as the Cockcroft-Gault equation. The authors are from the multiple institutions in the United States.
Parameters:
(1) age in years
(2) body weight in kilograms
(3) sex
(4) urine creatinine in mg/dL
Parameter
Finding
Points
age
140 - (age)
sex
male
1
female
0.85
estimated urine flow rate in mL per hour =
= (0.8333 * (points for age) * (weight) * (points for sex) / (urine creatinine)) + 9.5
Performance:
• The estimated flow rate was within 20% of the measured flow rate.
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