Social & Preventive Medicine General 45823648 Case finding in RNTCP is based on? A Sputum culture B Sputum microscopy C X-ray chest D PCR antibody detection High-Yield Explanation Ans. is 'b' i.e. Sputum microscopy Sputum smear examination by direct microscopy is the method of choice for case detection. Two sputum samples are collected.