BSA Dosage Calculator

How to calculate BSA-based dosage?

BSA dosing is used to normalize drug exposure across different body sizes, providing a more precise measurement of metabolic activity and physiological function than body weight alone.

Formula: Total Dose (mg) = BSA (m²) × Prescribed Dose (mg/m²)

Using the BSA Dosage calculator: an example

Consider a patient with a known BSA of 1.80 m² prescribed a chemotherapy agent at 75 mg/m².

Step-by-step calculation:

• Identify patient BSA (1.80 m²)
• Multiply by prescribed intensity (75 mg/m²)
• Calculate standard dose (135 mg)
• Apply adjustment percentage if required

Frequently Asked Questions

Why use BSA instead of weight?

BSA better correlates with cardiac output and metabolic rate, providing a more consistent drug exposure than total body weight alone.

Is this used for all medications?

No, BSA is primarily used for drugs with a narrow therapeutic index, such as chemotherapy or certain pediatric medications.

How is BSA determined?

BSA is typically calculated using formulas like DuBois or Mosteller based on the patient's height and weight before being entered here.