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:
A child weighing 98 lb and 3 feet 1 inches tall
If the adult dose of a drug is 300 mg,
what would be the dose in miligram for this child according to the BSA nomogram?
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lb equals 187 mg kg
- The patient height
= 3 feet 1 inches
= ( 3 × 12 + 1 ) inch
= 37 inch
= 37 × 2.54 cm
= 93.98 cm - patient weight
= 98 lb
= 98 × 0.454 kg
= 44.5 kg -
BSA for the patient is
BSA `= \quad sqrt(( Height (cm) × Weight (Kg) )/(3600))`
` \quad \quad \quad = sqrt(( 93.98 \quad cm × 44.5 \quad Kg )/(3600)) = 1.0778 ` m2
- By nomogram to calculate BSA you will get 0.97 `m^2`
- Using the formula:
Patient dose (mg) = `(BSA\quad (m^2)) / (1.73 \quad (m^2)) × ` Adult dose (mg) - Therefore, Patient dose` =(1.0778 \quad m^2)/(1.73 \quad m^2) × 300 \quad mg = 187 \quad mg` Ans.