Your estimated AUC/MIC ratio indicates whether the current vancomycin dosing regimen is achieving the therapeutic target. An AUC/MIC of 400-600 (assuming MIC of 1 mg/L) is the recommended target per the 2020 ASHP/IDSA/PIDS/SIDP consensus guidelines. An AUC/MIC below 400 suggests subtherapeutic dosing with risk of treatment failure, particularly in serious MRSA infections such as bacteremia, endocarditis, osteomyelitis, and pneumonia. An AUC/MIC above 600 is associated with increased risk of vancomycin-associated nephrotoxicity.

If your result is outside the target range, dose adjustment is likely needed. Increasing the dose or shortening the interval raises the AUC, while decreasing the dose or extending the interval lowers it. Renal function changes (improving or declining) will also shift the AUC, so ongoing monitoring is essential.

Use this calculator when monitoring vancomycin therapy for serious MRSA infections, particularly when Bayesian AUC monitoring software is not immediately available. It is intended for patients on steady-state vancomycin dosing who have at least one trough level drawn appropriately (within 30 minutes before the next scheduled dose).

This tool is most useful in initial dose optimization, when transitioning from empiric to targeted dosing, or when renal function changes necessitate dose re-evaluation. It should be used in conjunction with clinical pharmacist consultation for patients with complex pharmacokinetics (obesity, renal replacement therapy, critical illness, burns).

This calculator uses a simplified first-order pharmacokinetic model with an estimated volume of distribution of 0.7 L/kg, which may not be accurate for patients with obesity, fluid overload, critical illness, or pediatric populations. The true Vd can vary significantly (0.4-1.0 L/kg) depending on patient factors.

For clinical precision, Bayesian AUC monitoring software (such as PrecisePK, InsightRX, or DoseMeRx) is strongly preferred, as these platforms integrate multiple drug levels, population pharmacokinetic models, and individual patient covariates for more accurate AUC estimation. This calculator also assumes an MIC of 1 mg/L — if the actual MIC is 2 mg/L, the effective AUC/MIC is halved, and alternative antibiotics should be considered. Always consult a clinical pharmacist for vancomycin dosing decisions.