### 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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A adult weighing 109 lb and 5 feet 1 inches tall If the adult dose of a drug is 200 mg, what would be the dose in miligram for this adult according to the BSA nomogram?

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lb equals 169 mg kg

• The patient height
= 5 feet 1 inches
= ( 5 × 12 + 1 ) inch
= 61 inch
= 61 × 2.54 cm
= 154.94 cm

• patient weight
= 109 lb
= 109 × 0.454 kg
= 49.5 kg

• BSA for the patient is

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

 \quad \quad \quad = sqrt(( 154.94 \quad cm × 49.5 \quad Kg )/(3600)) = 1.4596  m2

• By nomogram to calculate BSA you will get 1.46 m^2
• Using the formula:
Patient dose (mg) = (BSA\quad (m^2)) / (1.73 \quad (m^2)) ×  Adult dose (mg)
• Therefore, Patient dose =(1.4596 \quad m^2)/(1.73 \quad m^2) × 200 \quad mg = 169 \quad mg Ans.