True statement about antistreptolysin ‘O’ titre is :
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
In normal people the titre is > 200
In acute glomerulonephritis the titre is low
ASO titre > 200 indicate rheumatic fever
It is poorly antigenic