# A 45-year-old patient with suspected pulmonary tuberculosis presents to the emergency department. Which assessment finding would be MOST indicative of active tuberculosis requiring immediate isolation precautions? > source: MyMerci (mymerci.kr) > url: https://mymerci.kr/pages/nclex_q.php?qn_id=541353 > language: ko > subject: Adult Health ## 문제 A 45-year-old patient with suspected pulmonary tuberculosis presents to the emergency department. Which assessment finding would be MOST indicative of active tuberculosis requiring immediate isolation precautions? ## 보기 1. Positive tuberculin skin test (TST) with 15mm induration after 48 hours 2. Productive cough with blood-tinged sputum for 3 weeks duration **✔ 정답** 3. Night sweats and unexplained weight loss of 10 pounds over 2 months 4. Chest X-ray showing calcified granulomas in the upper lung fields **정답: 2** ## 해설 Productive cough with blood-tinged sputum for 3 weeks is the most indicative sign of active pulmonary TB requiring immediate airborne isolation due to high transmission risk. Other options (positive TST, night sweats/weight loss, calcified granulomas) suggest latent or old infection, not active disease. ## 심화 해설 Understanding the Question This question asks you to identify the clinical finding most indicative of active pulmonary tuberculosis (TB) that necessitates immediate airborne infection isolation. The key distinction here is between latent TB infection (LTBI), prior treated TB, and active, infectious TB disease. Active TB occurs when Mycobacterium tuberculosis bacilli are multiplying and causing tissue damage, most commonly in the lungs, and can be transmitted via aerosolized droplet nuclei. Analysis of Options Option 1: Positive tuberculin skin test (TST) with 15mm induration after 48 hours A positive TST indicates a delayed-type hypersensitivity reaction to mycobacterial antigens, signifying infection with M. tuberculosis. However, this test cannot differentiate between latent TB infection (LTBI) and active TB disease. As noted in the literature, approximately one-fourth of the global population has TB infection, serving as a reservoir for potential reactivation, but the vast majority are asymptomatic and non-infectious [3]. A positive TST alone, in the absence of symptoms or radiographic evidence of active disease, does not warrant immediate isolation for airborne precautions. Option 2: Productive cough with blood-tinged sputum for 3 weeks duration This is the correct answer. A productive, prolonged cough is the hallmark of pulmonary TB, and the presence of hemoptysis (blood-tinged sputum) strongly suggests active tissue destruction and cavitary disease. Hemoptysis is a potentially life-threatening phenomenon directly linked to the erosion of bronchial vessels by the infectious, inflammatory process [4]. Critically, a cough, especially one producing sputum, is the primary mechanism for generating infectious droplet nuclei. The narrative review on prevention strategies emphasizes that healthcare environments pose a major occupational risk, particularly for workers with persistent contact with patients who may be infectious [1]. This symptomatic presentation defines a patient as highly suspect for active, transmissible TB, mandating immediate placement in a negative-pressure room with airborne precautions. Option 3: Night sweats and unexplained weight loss of 10 pounds over 2 months These constitutional symptoms (night sweats, fever, weight loss) are classic for active TB and reflect the systemic inflammatory response to the infection. While highly suggestive of active disease, they are not specific to pulmonary TB and, on their own, do not confirm respiratory tract infectiousness. A patient could have extrapulmonary TB with these symptoms but pose no airborne transmission risk. The presence of a cough generating aerosols is the critical factor for isolation decisions. Option 4: Chest X-ray showing calcified granulomas in the upper lung fields Calcified granulomas and a Ghon complex are radiographic hallmarks of prior, healed primary TB infection, not active disease. They represent the host's successful immune containment of the bacilli, walling them off in a caseous, then calcified, focus. This finding is consistent with LTBI or past infection, where the individual is asymptomatic and non-infectious. It does not necessitate immediate isolation. Key Clinical Takeaway The decision to initiate airborne infection isolation is based on the clinical suspicion of active, infectious pulmonary or laryngeal TB. The combination of a productive, prolonged cough and hemoptysis is the most specific indicator among the options for active pulmonary disease with a high probability of airborne transmission. This aligns with the primary preventive interventions aimed at diminishing exposure in healthcare settings, which are triggered by identifying the infectious source [1]. The risk of being infected with M. tuberculosis is shaped by the bacterial load of the source case, making a coughing patient with cavitary or endobronchial disease the highest transmission risk [3].References (research sources) - [1]Strategies for Tuberculosis Prevention in Healthcare Settings: A Narrative Review.Research articleDaradkeh AF, Alawyia B, Ballas H, Spernovasilis N, Alon-Ellenbogen D. (2025) · DOI: 10.3390/tropicalmed10110316 - [3]Series 2: Invisible Threats: A Global Scoping Review of Risk Factors for Tuberculosis Infection.Research articleMenon S, Harries AD, Dlodlo RA, Badoum G, Dogo MF, Mbitikon OB, Sinha P, Lin Y, Jaju J, Soe AN, Singh A, Kalottee B, Koura KG. (2026) · DOI: 10.3390/tropicalmed11040087 - [4]Beyond the Usual Suspects: Rare Causes of Hemoptysis.Research articleSekulovic-Radovanovic I, Sivokozov IV, Lalic N, Popevic S. (2026) · DOI: 10.3390/diagnostics16101465 ## 임상 시나리오 Active TB Isolation TriggersKey clinical findings requiring immediate airborne precautions The most specific indicator of active, infectious TB is a productive cough lasting 3 weeks or longer, especially with hemoptysis. This suggests cavitary disease with a high bacillary load. A positive TST or IGRA alone confirms infection but not active disease. Calcified granulomas on X-ray indicate prior, healed infection. Systemic symptoms like night sweats and weight loss are suggestive but less specific than hemoptysis. CautionImmediately place any patient with suspected active pulmonary TB in a negative pressure airborne infection isolation room and use N95 respirators. Do not wait for sputum smear results to initiate precautions. ## 핵심 개념 - **Hemoptysis** — Coughing up blood or blood-stained sputum, often indicating active pulmonary tissue destruction in tuberculosis. - **Airborne Precautions** — Infection control measures including negative pressure room and N95 respirator use to prevent transmission of aerosolized droplet nuclei. - **Tuberculin Skin Test (TST)** — A delayed-type hypersensitivity test detecting M. tuberculosis infection, but cannot differentiate between latent and active disease. - **Cavitary TB** — A form of active tuberculosis characterized by lung tissue destruction and cavity formation, associated with high bacillary load and infectivity. ## 같은 주제 문제 - [A nurse is assessing a 38-year-old patient who has been receiving treatment for pulmonary …](https://mymerci.kr/pages/nclex_q.php?qn_id=541354) - [A 65-year-old retired teacher presents to the emergency department with a 3-week history o…](https://mymerci.kr/pages/nclex_q.php?qn_id=541355) - [A 45-year-old patient with suspected pulmonary tuberculosis presents to the emergency depa…](https://mymerci.kr/pages/nclex_q.php?qn_id=541356) - [A nurse is caring for a patient with active pulmonary tuberculosis who has been on anti-tu…](https://mymerci.kr/pages/nclex_q.php?qn_id=541357) - [A nurse is assessing a patient with active pulmonary tuberculosis who has been on anti-tub…](https://mymerci.kr/pages/nclex_q.php?qn_id=541358) - [A nurse is caring for a patient with community-acquired pneumonia who has been on antibiot…](https://mymerci.kr/pages/nclex_q.php?qn_id=541359) - [A nurse is caring for a patient with active pulmonary tuberculosis who has been receiving …](https://mymerci.kr/pages/nclex_q.php?qn_id=541360) - [A nurse is caring for a patient with active pulmonary tuberculosis who has been on anti-tu…](https://mymerci.kr/pages/nclex_q.php?qn_id=541361) --- More free questions: [기출문제](https://mymerci.kr/) _학습 참고용입니다. 실제 임상은 최신 지침과 소속 기관 프로토콜을 따르세요._