Antistreptolysin O
Medically reviewed by Drugs.com. Last updated on Jul 7, 2024.
AMBULATORY CARE:
Antistreptolysin O
(ASO) is an antibody. This test is done to see if you have the ASO antibody in your blood. An antibody is a protein that is made by your immune system. The ASO antibody shows if you have had an infection caused by the Streptococcus bacteria. Some illnesses are caused by a previous Streptococcus bacterial infection.
How to get ready for the test:
Your healthcare provider will tell you when to have your blood test done. The blood test may be done before or after eating. Ask your healthcare provider if you should wait to take your medicines until after your blood is taken. Wear a short-sleeved or loose shirt on the day of the test. This will make it easier to draw your blood.
What you need to know about the test results:
Your healthcare provider will explain what your test results mean. The presence of ASO does not tell which disease you have now. It only tells if you have had a streptococcus infection that may have caused your illness. Several ASO tests may need to be done over a period of weeks.
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