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 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.


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