Pulmonologist: Role, Responsibilities, and Scope of Practice

A pulmonologist is an internal medicine physician with fellowship training in diseases of the respiratory system—lungs, airways, pleura, mediastinum, and respiratory control mechanisms.

Core Clinical Duties

• Diagnosis & Management: Asthma, COPD, ILD/PF, sarcoidosis, pneumonia, bronchiectasis, cystic fibrosis, pulmonary hypertension, sleep apnea, lung cancer (staging/workup), occupational/environmental lung disease, ARDS, respiratory failure.
• Procedural Expertise: Flexible bronchoscopy (diagnostic: BAL, biopsy, TBNA; therapeutic: stent, dilation, tumor debulking, foreign body), EBUS (endobronchial ultrasound), thoracentesis, chest tube placement, PFT interpretation, cardiopulmonary exercise testing.
• Critical Care: Most pulmonologists are dual-boarded in Critical Care Medicine. Manage ICU patients: mechanical ventilation (invasive/noninvasive), hemodynamic monitoring, sepsis, multi-organ failure.
• Longitudinal Care: Chronic disease management, exacerbation prevention, action plans, palliative/respiratory symptom control.

Diagnostic & Interpretive Role

• Pulmonary Function Tests (spirometry, lung volumes, DLCO, MIP/MEP, bronchial challenge).
• Imaging: CXR, CT (HRCT for ILD), PET-CT (nodules/cancer), MRI (mediastinum).
• Lab: Serologies (autoimmune), biomarkers (KL-6, SPD), genetic panels (CF, α1-antitrypsin).
• Sleep studies (polysomnography, HSAT).

Collaborative Practice

• Thoracic Surgery: Lung cancer, transplantation, complex airway.
• Oncology/Radiation: Multidisciplinary tumor boards.
• Allergy/Immunology: Severe asthma, eosinophilic disorders, ABPA.
• Rheumatology: CTD-ILD (scleroderma, RA, myositis).
• Primary Care: Co-management, referral criteria, vaccination.
• Palliative Care: Dyspnea management, goals of care.

Academic & System Roles

• Research: Clinical trials (IPF, severe asthma, lung cancer, ARDS), translational science.
• Education: Fellows, residents, med students, RTs, NPs.
• Quality/Leadership: ICU directorship, COPD pathways, sepsis bundles, antibiotic stewardship.
• Professional societies: ATS, CHEST, ERS — guidelines, advocacy.

Training Pathway

MD/DO → 3 yr Internal Medicine residency → 2–3 yr Pulmonary/Critical Care fellowship → ABIM boards (IM, Pulm, CCM). Total: 5–6 yrs post-med school.

Pulmonologists are the physician specialists for the respiratory system—spanning outpatient chronic care to the most complex critical illness.