The Antistreptolysin O (ASO) Titre checks for special(antibodies your body makes after a past infection with certain bacteria called group A Streptococcus. These bacteria can cause illnesses like strep throat and skin infections. The test helps your doctor find out if you recently had such an infection, even if you did not have clear symptoms. This is important because untreated strep infections can sometimes lead to other health problems later on.

Why is it Important

Detects Past Strep Infections
The test helps doctors find out if you had a recent infection by group A Streptococcus, even if you did not feel sick. This is important because some people do not have clear symptoms but can still develop complications later.
Prevents Serious Complications
Untreated strep infections can sometimes cause rheumatic fever, kidney problems, or skin conditions. Early detection with this test can help doctors take steps to protect your health.
Guides Treatment Decisions
Knowing if you had a past strep infection helps your doctor choose the best treatment, especially if you have symptoms like joint pain, fever, or rashes that could be linked to post-strep complications.
Monitors Recovery
The test can be repeated to see if antibody levels are going down, showing that your body is recovering from the infection.
Supports Accurate Diagnosis
The ASO Titre is often used along with other tests and your medical history to give a complete picture of your health, helping your doctor make the right diagnosis.

When Should I Get This Test?

You may need this test if you:

Have symptoms like joint pain, swelling, or fever after a sore throat or skin infection
Show signs of kidney problems, such as swelling or changes in urine, after a recent illness
Have a rash or unexplained fever that could be linked to a past strep infection
Your doctor suspects rheumatic fever or glomerulonephritis
Need to check for post-streptococcal complications, even if you did not have clear symptoms before

Interpretation of Test Results

Understanding what your results might mean is helpful, but always discuss them with a doctor for a proper diagnosis.

Result Type	What it Means
Normal	No or low antibodies; unlikely you had a recent strep infection
Borderline	Slightly raised levels; may suggest a recent infection or need for retesting
Abnormal	High levels; likely you had a recent strep infection, even if you felt fine

(Note: Specific normal ranges can vary slightly between labs and depending on individual factors. Always refer to the ranges provided on your report and consult your doctor.)

Additional Information

This test cannot tell if you currently have a strep infection; it only shows if you had one recently.
Sometimes, your doctor may repeat the test after a few weeks to see if antibody levels are changing.
Always share your full symptoms and medical history with your doctor for the best advice.

Test Requirements

Sample Type: Blood (taken from a vein in your arm)
Fasting: Not required for this test, but follow any special instructions from your doctor or lab.
Precautions: Inform your doctor about any medicines you are taking, as some drugs may affect results.

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FAQs

Do I need to fast before the Antistreptolysin O (ASO) Titre test?
No, fasting is not needed for this test. You can eat and drink as usual before your blood sample is taken. However, always follow any special instructions given by your doctor or lab.
What does a high ASO Titre result mean?
A high ASO Titre means your body has made antibodies after a recent infection with group A Streptococcus bacteria. It does not mean you have an active infection now, but it can help explain symptoms like joint pain or fever.
Can this test be done during pregnancy?
Yes, the test is safe during pregnancy. If you are pregnant and have had symptoms like a sore throat, rash, or unexplained fever, your doctor may suggest this test to check for past strep infections. Always inform your doctor if you are pregnant before any test.
What should I do if my test result is abnormal?
If your result is high, do not worry. It means you likely had a recent strep infection. Your doctor will look at your symptoms and may order more tests or start treatment if needed. Always discuss your results with a healthcare professional for the best advice.
Does a normal ASO Titre mean I never had a strep infection?
Not always. Sometimes, antibody levels may go back to normal after a few months, even if you had a strep infection earlier. If your symptoms continue, your doctor may recommend repeating the test or doing other tests for a clear diagnosis.

For more information, see Netmeds Health Library blog: Rheumatic Fever: Causes, Symptoms And Treatment (ASO) Titre Test at Netmeds to detect past strep infections and prevent complications. No fasting needed. Trusted labs. Book online today.

Antistreptolysin O (ASO) Titre Quantitative, Serum

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