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
Total tried: Correct: Wrong:
If the adult dose of a drug is 250 mg,
what would be the dose for a child weighing 51 lb
and measuring 2 feet 7 inches
in height using the BSA nomogram?
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lb equals 103 mg kg
- The patient height
= 2 feet 7 inches
= ( 2 × 12 + 7 ) inch
= 31 inch
= 31 × 2.54 cm
= 78.74 cm - patient weight
= 51 lb
= 51 × 0.454 kg
= 23.2 kg -
BSA for the patient is
BSA `= \quad sqrt(( Height (cm) × Weight (Kg) )/(3600))`
` \quad \quad \quad = sqrt(( 78.74 \quad cm × 23.2 \quad Kg )/(3600)) = 0.7123 ` m2
- By nomogram to calculate BSA you will get 0.65 `m^2`
- Using the formula:
Patient dose (mg) = `(BSA\quad (m^2)) / (1.73 \quad (m^2)) × ` Adult dose (mg) - Therefore, Patient dose` =(0.7123 \quad m^2)/(1.73 \quad m^2) × 250 \quad mg = 103 \quad mg` Ans.