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Transition Dyspnea Index (TDI)
Please visit this website for more information about the instrument:
Transition Dyspnea Index.
Exploratory: Amyotrophic Lateral Sclerosis (ALS).
Short Description of Instrument

The Transitional Dyspnea Index (TDI) is composed of three components: functional impairment, magnitude of effort and magnitude of task. Each component has one item. The test was developed to improve the clinical measure of dyspnea.


The TDI focal score is the sum of the three items per component. Scores for each TDI component are based on: -3 = Major deterioration; -2 = Moderate deterioration; -1 = Minor deterioration; 0 = No change; +1 = Minor improvement; +2 = Moderate improvement; +3 = Major improvement.

Takashi Hajiro, Koichi Nishmura, Mitsuhiro Tsukino, Akihiko Ikeda, Jiroshi Koyama, et al. Analysis of Clinical Methods Used to Evaluate Dyspnea in Patients with Chronic Obstructive Pulmonary Disease. Am. J. Respir. Crit. Care Med., Volume 158, Number 4, October 1998, 1185-1189.
Maher DA, Ward J, Fierro-Carrion G, Waterman LA, Lentine TF, Mejia-Alfaro R, Baird JC. Development of Self-Administered versions of modified baseline and transition dyspnea indexes in COPD. COPD. 2004;1 (2) 165-172.


Document last updated June 2019