Diagnostic Techniques in Respiratory Medicine

Diagnostic Performance and Clinical Utility

The American College of Chest Physicians recommends sputum cytology as the least invasive initial diagnostic method for suspected lung cancer, with a pooled sensitivity of 66% and specificity of 99%, particularly useful for central lesions (71% sensitivity) versus peripheral lesions (49% sensitivity) 1, 2, 3
Bronchoscopy is recommended for central lesions to confirm diagnosis, with further testing required if results are non-diagnostic 4

For peripheral lung nodules requiring tissue diagnosis, radial endobronchial ultrasound or electromagnetic navigation should be used as adjuncts to conventional bronchoscopy 4
Adequate tissue should be obtained to accurately define histologic type and perform molecular analysis for treatment planning, as modern lung cancer treatment increasingly depends on molecular profiling for targeted therapies 4, 5
The diagnostic accuracy of cytological techniques depends on institutional expertise in specimen collection, processing, and interpretation 1, 2