True statement about antistreptolysin 'O' titer is: (A) In normal people the titre is > 200, (B) In acute glomerulonephritis the titre is low, (C) ASO titre > 200 indicate rheumatic fever, (D) It is poorly antigenic
Answer is B. ASO (Anti Streptolysin 'O') titer:Estimation of antibody against streptolysin is a standard serological test for retrospective diagnosis of streptococcal infectionASO titer> 200 is indicative of prior streptococcal infectionRaised after throat infection onlyIn acute glomerulonephritis the titer is low