How is pulmonary tuberculosis diagnosed?

Tuberculosis (TB) is a common disease encountered in daily life and poses significant health risks. It severely compromises patients’ ability to work and threatens their lives, as it is a contagious disease. Although TB is curable, treatment is complex and demanding. Early diagnosis and intervention yield excellent therapeutic outcomes. So, how is pulmonary tuberculosis diagnosed?

How Is Pulmonary Tuberculosis Diagnosed?

The diagnosis of pulmonary tuberculosis primarily relies on sputum testing and imaging studies. Sputum examination includes sputum culture; a positive result is defined as the detection of Mycobacterium tuberculosis or acid-fast bacilli (AFB) in sputum smears. If imaging studies reveal characteristic tuberculous lesions, active tuberculosis can be diagnosed. Conversely, if only sputum bacterial tests are positive without supportive imaging findings, the diagnosis is latent Mycobacterium tuberculosis infection.

If TB testing is negative but imaging reveals calcified lesions, linear opacities, fibrotic nodules, or healed cavities, the diagnosis is inactive (latent) tuberculosis. Currently, tuberculosis is classified into three categories: inactive tuberculosis, active tuberculosis, and latent Mycobacterium tuberculosis infection. Prior to definitive diagnosis, clinicians primarily rely on patient history, clinical manifestations, and relevant ancillary examinations to identify suspected TB cases.

A patient’s medical history for pulmonary tuberculosis mainly focuses on prior exposure to individuals with confirmed TB. Key clinical manifestations include fatigue, insomnia, night sweats, low-grade fever in the afternoon, cough, sputum production, hemoptysis, chest pain, and dyspnea. We hope this information proves helpful to you.