### 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 300 mg, what would be the dose for a adult weighing 212 lb and measuring 4 feet 8 inches in height using the BSA nomogram? Click on the button below to see the answer and explanations

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lb equals 338 mg kg

• The patient height
= 4 feet 8 inches
= ( 4 × 12 + 8 ) inch
= 56 inch
= 56 × 2.54 cm
= 142.24 cm

• patient weight
= 212 lb
= 212 × 0.454 kg
= 96.2 kg

• BSA for the patient is

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

 \quad \quad \quad = sqrt(( 142.24 \quad cm × 96.2 \quad Kg )/(3600)) = 1.9496  m2

• By nomogram to calculate BSA you will get 1.82 m^2
• Using the formula:
Patient dose (mg) = (BSA\quad (m^2)) / (1.73 \quad (m^2)) ×  Adult dose (mg)
• Therefore, Patient dose =(1.9496 \quad m^2)/(1.73 \quad m^2) × 300 \quad mg = 338 \quad mg Ans.

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