The ASO test measures the level of antistreptolysin antibodies in the bloodstream. These antibodies are produced by the immune system when it encounters streptolysin O toxin created by group A Streptococcus (GAS) bacteria. The production of these antibodies is a response to the GAS bacteria and helps the body fight against the infection.
Alternative Names: ASLO; ASO titer
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Get A Second OpinionThe ASO test, also known as the antistreptolysin O titer test, evaluates the body's antibodies in response to the group A Streptococcus (GAS) bacteria.
However, a strep infection may sometimes not show symptoms and could result in post-streptococcal complications. To prevent such complications, doctors perform the ASO test.
If you show symptoms of post-streptococcal complications, such as
Medical professionals use the antistreptolysin O titer test to evaluate your body's levels of antistreptolysin antibodies, which can help diagnose whether you are experiencing post-streptococcal complications.
The healthcare provider may instruct you to fast for six hours before taking the ASO test. The procedure involves drawing blood from your inner arm vein with a fine needle, and the blood is then collected in a tube by the lab technician. The tube will be sent to the laboratory for examination.
The normal ASO test range for adults is below 200, while for children under five years, it is below 100. If your results exceed these levels, you may have a post-streptococcal complication.
Sometimes, even if your ASO test results are expected, your physician may recommend a follow-up test (second test) if you show symptoms of a post-streptococcal complication.
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Book an AppointmentAn abnormal or positive ASO titer test result indicates a recent strep infection, even if you did not experience symptoms.
Vein and artery sizes vary between individuals and even between different sides of the body. This can sometimes make it more difficult to draw blood from some people than others. The risks associated with blood draws are minimal but may include:
For ASO titer treatment, if the ASO test is positive, treatment may involve antibiotics or other medications to address any complications.
Before undergoing the antistreptolysin O titer test, the physician may advise you to fast for six hours to provide a blood sample.
The ASO test is not typically used to diagnose strep throat, as it is a blood test, not a throat swab test.
The ASO test is not typically used to monitor the effectiveness of streptococcal treatment, as ASO levels may remain elevated even after successful treatment.
Although the risks associated with the ASO test are very rare, they can include bleeding or bruising at the site where the blood is drawn and infection.
Yes, ASO levels can vary from person to person based on factors such as age, sex, and general health.
ASO titers may not be increased in cases involving cutaneous or renal sequelae but are elevated in 85% of individuals with rheumatic fever.
ASO treatment, in comparison to AAV treatment, does not result in a permanent cure and requires regular drug administration to the patient to keep the toxicity levels low.
The cost of an ASO test is approximately Rs. 500/-
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