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Predicting the Appropriate Size of Endotracheal Tube Using Middle Finger Length versus Traditional Formulae in

Padmanabha Kaimar1, Kanakaveeti Gireeswar Reddy2, M Kavya Prabhu1

  • 1Department of Anaesthesiology, Kasturba Medical College, Manipal Academy of Higher Education, Manipal, Karnataka, India.

Annals of African Medicine
|June 8, 2026
PubMed

Insights

Age-based formulas (ABFs) are more accurate for predicting pediatric endotracheal tube (ET) size. However, the middle finger length (MFL) formula is a better predictor in children under five years old.

Area of Science:

  • Pediatric Anesthesiology
  • Medical Device Sizing
  • Clinical Prediction Models

Background:

  • Accurate sizing of cuffed endotracheal tubes (ETTs) is critical in pediatric anesthesia.
  • Existing formulas for predicting pediatric ETT internal diameter (ID) vary in accuracy.
  • A novel formula using middle finger length (MFL) has been proposed for ETT sizing.

Purpose of the Study:

  • To evaluate the accuracy of the MFL formula for predicting pediatric cuffed ETT ID.
  • To compare the MFL formula's performance against commonly used pediatric ETT sizing formulas.
  • To identify the most reliable formula for ETT selection in pediatric patients.

Main Methods:

  • A comparative observational study involving 120 pediatric patients (up to 12 years) undergoing surgery.
  • Collection of patient data including age, height, weight, and MFL prior to surgery.
  • Comparison of actual ETT ID with sizes predicted by MFL, age-based (ABFs), height-based (HBF), weight-based (WBF), and Multivariate prediction tool (MPT) formulas.

Main Results:

  • Age-based formulas (ABFs) showed higher accuracy in exact ETT ID prediction (18.3%) compared to MFL (20%) and others.
  • When considering a 0.5 mm difference, ABFs achieved 57.5% accuracy, significantly outperforming MFL (20.8%) and other methods.
  • The MFL formula was a better predictor in children under five years, while ABFs were superior for the overall pediatric cohort.

Conclusions:

  • Age-based formulas demonstrate superior accuracy for predicting pediatric endotracheal tube size overall.
  • The middle finger length formula shows promise as a more accurate predictor in very young children (under 5 years).
  • Further research may refine ETT sizing strategies based on patient age and anthropometric measurements.
Abstract

Keywords:
Airway managementGestion des voies respiratoiresanesthésie généraleballonnetcuffedendotracheal tubegeneral anesthesiaintubationpediatricpédiatriesonde endotrachéale

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