ASO Test | ASO Titre Test | ASO High Titre | Antistreptolysin O Test |
The ASO titer test measures antibodies produced by your body in response to a toxin known as streptolysin O.
Streptolysin O is a toxin produced by group A Streptococcus bacteria,
Why the Test is Performed
Your doctor will order the ASO titer test if you have symptoms of post-streptococcal complications.
Some of the common complications of strep include:
bacterial endocarditis
glomerulonephritis
rheumatic fever
Scarlet fever
Strep throat
What do the results mean?
Generally, an ASO test value below 200 is considered normal.
In children under the age of 5, the test value should be less than 100.
If your results show that you have an elevated ASO value, you may have a post-streptococcal complication
Your doctor may repeat the test within 10 to 14 days to confirm your results.
If the results of your tests show that your ASO antibodies are increasing, it’s likely that your infection is recent
Declining antibody levels suggest that your infection is getting better.