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Related Experiment Video

Updated: May 13, 2026

Methodology for Sputum Induction and Laboratory Processing

Methodology for Sputum Induction and Laboratory Processing

Published on: December 17, 2017

Induced sputum in interstitial lung diseases - A pilot study.

L Araújo¹, M Beltrão, C Palmares

¹Immunology, Faculty of Medicine, University of Porto, Porto, Portugal. luisaraujo@med.up.pt

Revista Portuguesa De Pneumologia

|March 13, 2013

Summary

Induced sputum is a safe and feasible method for evaluating interstitial lung diseases (ILD). While cell counts differ from bronchoalveolar lavage, sputum analysis aids in distinguishing ILD types.

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Area of Science:

Pulmonary Medicine
Diagnostic Procedures
Cellular Biology

Background:

Induced sputum using hypertonic saline is a potential alternative to bronchoalveolar lavage for interstitial lung diseases (ILD).
This method is suggested to be safer and more cost-effective for ILD patient evaluation.

Purpose of the Study:

To assess the safety and feasibility of sputum induction in patients with ILD.
To compare the cellular profiles obtained from induced sputum with results from bronchoalveolar lavage (BALF).

Main Methods:

Twenty patients with ILD underwent sputum induction with 4.5% saline within two weeks of bronchoalveolar lavage.
Cellular counts (total and differential) and viability were analyzed.
Statistical analysis included Wilcoxon test and Spearman's rank correlation (p<0.05 significance).

Main Results:

A satisfactory sputum sample was obtained in 75% of subjects (15 out of 20).
Sputum induction was discontinued in one patient due to a significant drop in peak expiratory flow (PEF).
Cellular profiles differed significantly between induced sputum and BALF (P < .05), except for eosinophils, with no significant correlation found between the methods.

Conclusions:

Induced sputum is a safe and feasible diagnostic tool for interstitial lung diseases.
Despite differing cell counts compared to bronchoalveolar lavage fluid, sputum cellular profiles show potential in differentiating between various ILD subtypes.