True statement about antistreptolysin ‘O’ titre 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’) titre :
Estimation of antibody against streptolysin is a standard serological test for retrospective diagnosis of streptococcal infection
ASO titre > 200 are indicative of prior streptococcal infection
Raised after throat infection only
In acute glomerulonephritis the titre is low