 # Body Surface Area and Advanced Pediatric Calculations

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Body Surface Area and Advanced Pediatric Calculations
Chapter 15 Revised KBurger 1108

BSA (m2) Calculation To calculate Body Surface Area (BSA) in m2 based on metric measurement of height and weight: BSA (m2) =

BSA (m2) Calculation To calculate BSA in m2 based on household measurement of height and weight: BSA (m2) =

BSA (m2) Calculation Calculate in Metric
BSA of a child whose height is 105 cm (42 in) and weight is 31.8 kg (70 lb).

BSA (m2) Calculation

BSA (m2) Calculation Calculate in Household
BSA of a child whose height is 105 cm (42 in) and weight is 31.8 kg (70 lb).

BSA (m2) Calculation

Verifying Safe Dosages: BSA Method
Verify safe pediatric dosage based on BSA: Determine BSA in m2. Calculate the safe dosage based on BSA: mg per m2 × m2 = X mg Compare ordered dosage to recommended dosage Decide if the dosage is safe.

Verifying Safe Dosages: BSA Method
If dosage is safe Calculate amount to give and administer dose If dosage seems unsafe, consult with ordering practitioner before administering

Verifying Safe Dosages: BSA Method
Note: Recommended dosage may specify: mg per m2 Mcg per m2 g per m2 Units per m2 M units per m2 mE q per m2

Calculation of Safe Dosage by BSA
A child is 126 cm tall and weighs 23 kg. Drug order reads: Oncovin 1.8 mg IV at 10 A.M. Is this dosage safe? Recommended dosage is 2 mg per m2 .

Calculation of Safe Dosage by BSA

Calculation of Safe Dosage by BSA
Determine BSA Calculate recommended dosage Mg per m2 × m2 = 2 mg per m2 × 0.9 m2 = 1.8 mg

Calculation of Safe Dosage by BSA
3. Decide if the dosage is safe Dosage ordered is 1.8 mg and 1.8 mg is amount recommended by BSA 4. Calculate one dose

Calculation of Safe Dosage by BSA
Step 1. Convert No conversion is necessary. Step 2. Think Give more than 1 mL and less than 2 mL

Calculation of Safe Dosage by BSA
Step 3. Calculate Use ratio-proportion: X = 1.8 mL

BSA Nomogram Chart that estimates BSA by plotting height and weight.
See page 380 in Pickar BSA Nomogram Chart that estimates BSA by plotting height and weight. Find height and weight on columns and draw a straight line between them Point where crosses the SA column = BSA NOTE: incremental spaces are not consistent. Take care to read numbers and calibration values correctly.

Total Daily IV Fluid for Children
Use this formula to calculate the daily rate of pediatric maintenance IV fluids: 100 mL per kg per day for the first 10 kg of body weight 50 mL per kg per day for the next 10 kg of body weight 20 mL per kg per day for each kg above 20 kg of body weight

Total Daily IV Fluid for Children
Child who weighs 24 kg 100 mL per kg per day × 10 kg = 1000 mL per day (for first 10 kg) 50 mL per kg per day × 10 kg = 500 mL per day (for next 10 kg) 20 mL per kg per day × 4 kg = 80 mL per day (for remaining 4 kg) TOTAL 1580mL per day

Total Daily IV Fluid for Children Calculating hourly IV flow rate
1000 mL per day + 500 mL per day + 80 mL per day = 1580 mL per day