How is pulmonary tuberculosis diagnosed?
Nov 09, 2020
Source: Cainiu Health
Dr. Guo Xiheng
Introduction
How is pulmonary tuberculosis diagnosed? It can be confirmed through sputum smear examination and chest CT imaging. Pulmonary tuberculosis is a lung inflammatory condition caused by infection with *Mycobacterium tuberculosis*. Patients commonly present with symptoms such as cough, sputum production, and low-grade fever. Physicians can detect this disease using chest CT, which typically reveals lesions—often associated with acid-fast bacilli—in the apical–posterior segments of the upper lobes or the dorsal segments of the lower lobes.
After contracting pulmonary tuberculosis, patients may experience a range of symptoms including productive cough, hemoptysis (coughing up blood), chest tightness, and chest pain. Upon onset of these symptoms, many individuals mistakenly attribute them to other pulmonary conditions, thereby delaying diagnosis and missing the optimal window for treatment—potentially leading to more severe complications. To confirm whether one has pulmonary tuberculosis, the most reliable approach is to seek comprehensive evaluation and diagnosis at a reputable medical institution. So, how is pulmonary tuberculosis diagnosed? Below is an explanation.
How Is Pulmonary Tuberculosis Diagnosed?
Generally, pulmonary tuberculosis can be definitively diagnosed through sputum smear microscopy and chest CT imaging. This disease results from infection with Mycobacterium tuberculosis, triggering an inflammatory response in the lungs. Common clinical manifestations include persistent cough, sputum production, and low-grade fever. Chest CT scans often reveal characteristic lesions—typically in the apical-posterior segments of the upper lobes or the dorsal segments of the lower lobes—where acid-fast bacilli (AFB) may be detected in sputum. In addition to laboratory and imaging findings, diagnosis should incorporate relevant clinical history, such as prolonged low-grade fever, chronic cough, hemoptysis, unexplained weight loss, documented exposure to tuberculosis, or recent malnutrition—all of which support the diagnosis. Importantly, tuberculosis is not a hopeless condition; with timely, standardized anti-tuberculosis therapy, it is fully curable.
Knowledge Extension: Preventive Measures Against Pulmonary Tuberculosis
1. Control of Infectious Sources
The primary reservoirs of tuberculosis transmission are individuals with active, secondary pulmonary tuberculosis. Since Mycobacterium tuberculosis is predominantly expelled from the body via sputum, only patients whose sputum tests positive for the bacillus are considered infectious. Early initiation of appropriate chemotherapy in sputum-positive patients significantly reduces both the quantity and viability of the bacteria in their sputum.
2. Interruption of Transmission Routes
Tubercle bacilli are transmitted primarily via the respiratory tract—through coughing, sneezing, laughing, or speaking loudly. Therefore, spitting in public places must be strictly prohibited. Sputum, personal items, and surrounding surfaces belonging to patients with confirmed sputum-positive tuberculosis require thorough disinfection and appropriate handling. Indoor air can be disinfected using ultraviolet (UV) irradiation; utensils used by patients should be boiled for sterilization; and bedding should be exposed to direct sunlight. Additionally, maintaining good indoor ventilation, ensuring clean air, bathing regularly, and changing clothes frequently are essential daily preventive practices.
The above outlines key diagnostic approaches for pulmonary tuberculosis. We hope this information proves helpful to you.
