What a difference a day makes: same-day vs. 2-day sputum smear microscopy for diagnosing tuberculosis
Objective: Same-day sputum microscopy is now recommended for tuberculosis (TB) diagnosis. We compared this method against the conventional 2-day approach in routine programmatic settings.
Methods: During October–December 2012, all adult presumptive TB patients were requested to provide three sputum samples (one at the initial visit, the second 1 h after the first sample, and the third the next morning) for examination by Ziehl-Neelsen smear microscopy. Detection of acid-fast bacilli with any sample was diagnostic. The first and second spot sample comprised the same-day approach, and the first spot sample and next-day sample comprised the 2-day approach.
Results: Of 2168 presumptive TB patients, 403 (18.6%) were smear-positive according to the same-day method compared to 427 (19.7%) by the 2-day method (McNemar's test, P < 0.001). Of the total 429 TB patients, 26 (6.1%) were missed by the same-day method and 2 (0.5%) by the 2-day method.
Conclusion: Same-day specimen collection for microscopy missed more TB than 2-day collection. In India, missing cases by using same-day microscopy would translate into a considerable absolute number, hindering TB control efforts. We question the indiscriminate switch to same-day diagnosis in settings where patients reliably return for testing the next day.
Document Type: Research Article
Affiliations: 1: World Health Organization Country Office for India, New Delhi, India 2: Department of Health, Government of Assam, Guwahati, Assam, India 3: Division of Global HIV and Tuberculosis, Centers for Disease Control and Prevention, Atlanta, Georgia, USA 4: Department of Health, Government of Tripura, Agartala, Tripura, India 5: International Union Against Tuberculosis and Lung Disease (The Union), Paris, France, The Union, South-East Asia Office, New Delhi, India
Publication date: December 21, 2016
Public Health Action (PHA), The Union's quarterly open access on-line journal, provides a platform for its mission 'Health solutions for the poor'. PHA addresses the need for show-casing operational research that addresses issues in health systems and services. It publishes high-quality scientific research that provides new knowledge to improve access, equity, quality and efficiency of health systems and services.
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