Yashoda Hospitals > Diagnostics > ASO Test

What is ASO test?

The full form of the ASO test is the antistreptolysin O titer test. The ASO test is used to measure the antibodies that are produced by your body when it comes in contact with the toxin called streptolysin O. This toxin is created by group A Streptococcus (GAS) bacteria. As a response to the GAS bacteria, your body produces antistreptolysin O antibodies.

The antistreptolysin O titer test will reveal whether you had a strep infection by measuring the level of antistreptolysin antibodies in the blood. The test results will help your doctor avoid the chances of a post-streptococcal complication.

Understanding the ASO test results

An ASO test measures the level of antibodies produced by the body in response to a streptococcal infection. The ASO test normal range varies depending on age, with adults having a normal value of less than 200, while children under five years have a normal value of less than 100.

If your ASO test results are higher than the normal range, it suggests that you had a recent streptococcal infection. On the other hand, if your ASO test results are within the normal range but you still exhibit symptoms of a post-streptococcal complication, your doctor may recommend repeating the test to avoid missing any potential complications.

In conclusion, the ASO test results can help doctors diagnose and manage streptococcal infections and prevent complications. If you have any concerns or questions about your ASO test results, it is important to consult your doctor for further guidance.

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    Frequently Asked Questions

    The ASO test or antistreptolysin O titer test is used to measure the antibodies produced by your body as a response to the group A Streptococcus (GAS) bacteria. Sometimes a strep infection goes undetected because of a lack of symptoms. But it might lead to post-streptococcal complications. To avoid such complications, your doctor conducts the ASO test.

    Your doctor will advise an ASO test if you exhibit symptoms of post-streptococcal complications. The symptoms of post-streptococcal complications are bacterial endocarditis, rheumatic fever and glomerulonephritis. Your doctor can determine whether you are suffering from post-streptococcal complications by measuring your antistreptolysin antibodies through the antistreptolysin O titer test.

    Your doctor might advise you to refrain from eating or drinking anything for six hours before the test. During the test, you will have to give a blood sample from the vein of your inner arm. The lab technician will draw your blood through a thin needle and then collect it in a tube. The tube will be sent to the lab to be analysed.

    The normal range of the ASO test for adults is less than 200. The normal range of the ASO test for children below five years is less than 100. If your results are above normal levels, it indicates you have a post-streptococcal complication. Sometimes if your results are normal but you exhibit symptoms of a post-streptococcal complication, your doctor might recommend a second test.

    The ASO test is conducted to measure the level of antistreptolysin antibodies present in your blood to check whether you had a streptococcus infection recently. Your doctor might recommend not eating or drinking anything for six hours before giving a blood sample for the antistreptolysin O titer test.

    Some symptoms that ASO positive patients display are:

    • Joint swelling and pain
    • Fever
    • Skin rash
    • Heart inflammation (carditis), leading to shortness of breath, chest pain or palpitations.
    • Fatigue
    • High blood pressure
    • Swelling (oedema)
    • Painless nodules under the skin

    Your doctor might tell you not to eat or drink anything for six hours before the ASO test. Your doctor might also advise you to stop taking some medicines like corticosteroids before the test. These medicines reduce your ASO antibodies, thereby making it difficult for your doctor to confirm post-streptococcal complications.

    Although the ASO test is generally safe, it might include certain complications:

    • Difficulty in obtaining blood, requiring multiple needle pricks.
    • Bleeding after drawing blood from the needle site.
    • Infection at the needle site, although rare.
    • Blood accumulation or hematoma at the needle site.

    High ASO levels usually indicate a recent streptococcal infection. Controlling a high ASO titer usually involves treating the underlying infection, which may include antibiotics, anti-inflammatory medications, or other therapies to manage symptoms and avoid complications.

    A positive result indicates the presence of antistreptolysin antibodies, indicating a recent strep infection. However, if you have an underlying illness, such as rheumatic fever, this test will not detect an increase in antibodies. As a result, in such cases, you may require additional tests to confirm that you have an active infection.

    Book an appointment with us  and get a free second opinion.