### Patient dose based on BSA from nomogram

6. Patient-based Dose 6.3) Body Surface Area 6.3.1) Body Surface Area

6.3.1.3) Dose via BSA nomogram Normal 1

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If the adult dose of a drug is 80 mg, what would be the dose for a adult weighing 276 lb and measuring 6 feet 3 inches in height using the BSA nomogram?

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lb equals 119 mg kg

• The patient height
= 6 feet 3 inches
= ( 6 × 12 + 3 ) inch
= 75 inch
= 75 × 2.54 cm
= 190.5 cm

• patient weight
= 276 lb
= 276 × 0.454 kg
= 125.3 kg

• BSA for the patient is

BSA = \quad sqrt(( Height (cm) × Weight (Kg) )/(3600))

 \quad \quad \quad = sqrt(( 190.5 \quad cm × 125.3 \quad Kg )/(3600)) = 2.5750  m2

• By nomogram to calculate BSA you will get 2.52 m^2
• Using the formula:
Patient dose (mg) = (BSA\quad (m^2)) / (1.73 \quad (m^2)) ×  Adult dose (mg)
• Therefore, Patient dose =(2.5750 \quad m^2)/(1.73 \quad m^2) × 80 \quad mg = 119 \quad mg Ans.