Is induced sputum a useful noninvasive tool in the diagnosis of pulmonary sarcoidosis?

Ayşe Baha, Fatma Yıldırım, Moshe Stark, Ayşe Kalkancı, Elizabeth Fireman, Nurdan Köktürk

Research output: Contribution to journalArticlepeer-review


OBJECTIVES: In patients with pulmonary sarcoidosis, the provocation of sputum expectoration through the inhalation of hypertonic saline has been investigated as an alternative diagnostic tool for invasive procedures. We aimed to assess the diagnostic value of induced sputum (IS) by observing its cell distribution in patients with a confirmed histopathological diagnosis of sarcoidosis. MATERIALS AND METHODS: In this prospective, cross-sectional study, we compared the IS results of 20 patients with a histopathologically confirmed pulmonary sarcoidosis diagnosis and 24 healthy volunteers. The percentages of macrophages, lymphocytes, neutrophils, and eosinophils in IS and the CD4/CD8 ratio were compared. RESULTS: The percentage of lymphocytes in IS was significantly higher in the pulmonary sarcoidosis patients compared to the control group (41.6% vs 8.9%, p<0.001). There were no significant differences in the other IS cell percentages and CD4+/CD8+ ratio between the groups. Sputum induction was well tolerated. CONCLUSION: Sputum induced by the inhalation of hypertonic saline is a safe, inexpensive, less invasive, and easily repeated method and can be a valuable alternative to other invasive methods in the diagnosis of pulmonary sarcoidosis.

Original languageEnglish
Pages (from-to)248-252
Number of pages5
JournalTurkish Thoracic Journal
Issue number4
StatePublished - Oct 2019
Externally publishedYes


  • Clinical problems
  • Diagnostic methods
  • Interstitial lung disease


Dive into the research topics of 'Is induced sputum a useful noninvasive tool in the diagnosis of pulmonary sarcoidosis?'. Together they form a unique fingerprint.

Cite this