Six-Minute Walk Distance (6MWD)

Calculates predicted six-minute walk distance using reference equations (Enright 1998, Troosters 1999). Compares measured 6MWD to predicted values to assess functional status in COPD, heart failure, and pulmonary hypertension.

years
Age in years.
cm
Height in centimeters.
kg
Weight in kg.
Sex at birth.
meters
If provided, calculates % predicted.

Enter patient data to calculate predicted 6MWD

References

  1. Reference equations for the six-minute walk in healthy adults — American Journal of Respiratory and Critical Care Medicine (1998)
  2. Six minute walking distance in healthy elderly subjects — European Respiratory Journal (1999)

Clinical Notes & Warnings

  • Reference equations vary by population and walking course geometry.
  • 6MWD is influenced by motivation, encouragement, and practice.
  • An improvement of 54 meters (or 30-50m) is considered clinically meaningful.
  • 6MWD <350m predicts increased mortality in many chronic lung diseases.
  • Different equations exist for different ethnic groups and countries.

The Enright and Sherill 1998 equations are the most widely cited. Some studies use simpler approximations: 6MWD ~ 500-700m for healthy adults. A change >54m is considered clinically significant (MCID). In COPD, 6MWD correlates with survival and quality of life.