![]() Looking at this result, we can assume that patient's CrCl is below the normal range. Using the example above (55 inch male patient): IBW 21.53 (BMI value above) x (55 x 0.0254) 2 42 kg. Now, we can use the Cockcroft-Gault equation to calculate creatinine clearance:ĬrCl = (140 - age) × weight × sex / (72 × sCr)ĬrCl = (140 - 67) × 78.14 × 1 / (72 × 1.4) We can then use this association to generate an equivalent ideal weight based on this standardized BMI and the height of the patient. IBW = 50 kg + (0.9 kg × (height (cm) − 152))Īfter finding out what IBW is, we can come back to the equation: Where we need to calculate ideal body weight (IBW) first: His serum creatinine equals 1.4 mg/dL.īMI = weight /(height × height )Īccording to BMI, Bob is obese, so adjusted body weight needs to be calculated to use the Cockcroft-Gault equation: Weight in pounds 5 x BMI + (BMI divided by 5) x (Height in inches minus 60) Weight in kilograms 2.2 x BMI + (3.5 x BMI) x (Height in meters minus 1.5) The biggest differences between the older equations and the newer equation come in the taller height range. He is 67 years old, weighs 92 kilograms (203 lbs – you can switch between units when you use our CrCl calculator!), and is 173 cm tall. For a target BMI of 20 the formula looks like so: Ideal weight (kg) 44 + 70 x (Height (m) - 1.5 m), while for the value of 22 we use as default it becomes 48.4. We use a value of 22 in this online tool. Let's calculate CrCl for a theoretical patient named Bob. It is as follows: Weight (kg) 2.2 x BMItarget + 3.5 x BMItarget x (Height (m) - 1.5 m) BMI target is the target BMI for the calculation. TBW – Total body weight (current weight). Our calculator counts it on its own, but if you want to know more, head to the ideal weight calculator.įor patients who are overweight or obese (BMI ≥25), a 40% adjustment factor should be used: The following options can help take the pressure off. Patients with normal weight (BMI 18.5-25) – unbiased CrCl can be calculated using ideal body weight. Dieters often aim for a specific weight, a goal which can add unnecessary pressure to health and diet. and Winter et al., the following adjustments can be made:įor underweight patients (BMI <18.5), actual body weight should be used in the calculations. However, according to the studies of Brown et al. The Cockcroft-Gault body weight controversy still remains unresolved. To account for this problem, clinicians have been discussing different methods of controlling for obesity. Serum creatinine production is associated with lean body mass, not fat, as the muscle tissue is responsible for creatinine production. Abnormal body weight, especially obesity, is one of the problems in the estimation of renal function. ![]() However, using this formula is associated with some inaccuracies. The Cockcroft-Gault equation is the most widely used method of quantifying renal function for drug dosing.
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