Base ideal body weight used in Cockcroft-Gault for male and female before height adjustments is?

• A. 50 kg for Male; 45.5 kg for Female
• B. 60 kg for Male; 50 kg for Female
• C. 55 kg for Male; 50 kg for Female
• D. 45 kg for Male; 40 kg for Female

Answer: (A)

The calculation relies on a baseline ideal body weight to size the creatinine clearance estimate. The standard starting values are 50 kg for males and 45.5 kg for females, representing the ideal weight for a person about 5 feet tall (the base of the Devine formula). When height varies, you adjust from this base by adding or subtracting weight (about 2.3 kg per inch over or under 5 feet) to get the appropriate IBW for that individual. Using these base numbers keeps the calculation consistent for the initial estimate, and other weights are only used after applying height-based adjustments or choosing a different weighting approach.