Carboplatin Calculator

Carboplatin dosing relies heavily on the patient's kidney function because the drug is primarily eliminated via glomerular filtration. The standard approach uses the Calvert formula, which relates the total dose to the desired Area Under the Curve (AUC) and Glomerular Filtration Rate (GFR). First, the patient's GFR is estimated using the Cockcroft-Gault equation: GFR = Sex * ((140 - Age) / Serum Creatinine) * (Weight / 72), where the sex multiplier is 1.0 for males and 0.85 for females. Next, the carboplatin dose is calculated using the formula: Dose (mg) = Target AUC * (GFR + 25). To prevent severe bone marrow suppression, safety caps are enforced, setting a maximum allowable dose based on a capped GFR or predefined clinical thresholds like Maximum Dose = Target AUC * 150.

Let us walk through a clinical scenario for a 55-year-old female patient weighing 70 kg, with a serum creatinine level of 1.0 mg/dL, and a target AUC of 5. First, we calculate her GFR using the Cockcroft-Gault equation: GFR = 0.85 * ((140 - 55) / 1.0) * (70 / 72). This simplifies to 0.85 * 85 * 0.9722, yielding an estimated GFR of approximately 70.2 mL/min. Next, we apply the Calvert formula to find the carboplatin dose: Dose = 5 * (70.2 + 25) = 5 * 95.2 = 476 mg. Finally, we check against safety limits. If the maximum dose rule applies (Target AUC * 150 = 750 mg), our calculated dose of 476 mg is safely below the ceiling, making 476 mg the final recommended dose.

Always verify serum creatinine values and patient weight using the most recent laboratory panels prior to running the calculation, as rapid fluctuations in renal function directly impact clearance. Be mindful of actual versus ideal body weight; in obese patients, institutional protocols may recommend adjusted body weight to prevent overestimation of GFR. Always cross-reference the calculated output with institutional guidelines and maximum dose caps to guarantee patient safety.