Interpretation
of ASO Titer Assay
U the
reciprocal of the highest dilution showing no hemolysis is the ASO titer (Todd units)
U the test
should be repeated in 2 weeks and if there is a 4-fold increased titer (>two tubes) then it
indicates a positive test
U negative
test (low titer) does not rule out possible disease
U normal range
= < 166 Todd units
