Validitas Pemeriksaan Complex Specific Antigen Mycobacterium tuberculosis Region of Difference 1‒3 Metode Rapid Immunochromatography pada Sputum Penderita Tuberkulosis Paru

Pulmonary tuberculosis (TB) is still a global health problem. The diagnosis of pulmonary tuberculosis is based on sputum smear microscopy for acid fast bacilli (AFB) using Ziehl-Neelsen staining. However, this method has low sensitivity. Tuberculosis antigen immunochromatographyrapid test (ICT) is a quick, easy, and practical test which does not require special skills. This test is used to detect the antigen secretion of early secretory antigenic target 6 kDa protein (ESAT6), culture filtrate protein (CFP10)and Mycobacterium protein tuberculosis (MPT64) from Mycobacterium tuberculosis which are encoded by the region of difference (RD) 1, RD2 and RD3 genes. The aim of this study was to determine the validity of TB antigen for the diagnosis of pulmonary tuberculosis. The study was conducted during the period of September 2012 to March 2013 in Dr. Hasan Sadikin General Hospital (RSHS) Bandung. This study is a descriptive observational study using cross sectional approach and validity analysis. From September 2012 until March 2013 there were 149 subjects, in which the dominant age group was 30‒39 years. All the specimens were cultured on Ogawa medium as the gold standard and niasin tests were performed on all positive cultures. The TB antigen rapid ICT and sputum smear microscopy AFB were done on all the samples. From 149 subjects, 56 were positive, 86 were negative and 7 were contaminated. The sensitivity and specificity of TB antigen rapid ICT were 95.7% and 87.2%, respectively. In conclusion, TB antigen rapid ICT has a high validity which can be used as alternative laboratory tests for screening in patients with suspected pulmonary tuberculosis.