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Weight estimation in paediatrics: a comparison of the APLS formula and the formula 'Weight=3(age)+7'

Mark D Luscombe1, Ben D Owens, Derek Burke

  • 1Anaesthetic Department, Doncaster Royal Infirmary, Doncaster, UK. mark.luscombe@dbh.nhs.uk

Emergency Medicine Journal : EMJ
|July 28, 2010
PubMed

Insights

The formula Weight=2(age+4) significantly underestimates pediatric weight, potentially leading to under-resuscitation. A new formula, Weight=3(age)+7, offers a more accurate estimation for children aged 1-13 years.

Area of Science:

  • Pediatric emergency medicine
  • Clinical pharmacology
  • Biostatistics

Background:

  • Accurate weight estimation is critical for pediatric resuscitation.
  • Current weight estimation formulas may not reflect contemporary pediatric anthropometrics.

Purpose of the Study:

  • To evaluate the accuracy of the current pediatric weight estimation formula: Weight(kg)=2(age+4).
  • To assess a newly derived formula: Weight(kg)=3(age)+7.
  • To compare the validity of both formulas in a pediatric emergency department population.

Main Methods:

  • Retrospective study of 93,827 children aged 1-16 years.
  • Data collected from pediatric attendances at a major UK emergency department (ED).
  • Comparison of actual weights against estimated weights using both formulas.

Main Results:

  • The formula Weight=2(age+4) underestimated weights by a mean of 33.4%.
  • The formula Weight=3(age)+7 underestimated weights by a mean of 6.9%.
  • The formula Weight=3(age)+7 was applicable from 1 to 13 years.

Conclusions:

  • The current weight estimation formula leads to significant underestimation, risking under-resuscitation.
  • The formula Weight=3(age)+7 provides a safer and more accurate weight estimate for children aged 1 year to puberty.
  • Improved weight estimation is crucial for safe and effective pediatric emergency care.
Abstract

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