ASO Titre (Antistreptolysin O)

ASO Titre Test: quick answers

ASO Titre Test full form

Antistreptolysin O

ASO Titre Test price

₹1,099, home sample collection

Normal range (adults)

Adults (typical upper limit): Up to 200 IU/mL; Children: Upper limit varies with age; school-age children often run higher

Done for

Suspected rheumatic fever, with joint pain or a heart murmur after a sore throat; Suspected post-streptococcal glomerulonephritis, with swelling or cola-coloured urine; Evidence of a recent streptococcal infection for the Jones criteria

Fasting

Not required

Report

Same day / 24 hours

What is the ASO Titre Test?

The ASO titre test measures antibodies against streptolysin O, a toxin made by group A streptococcus bacteria. A raised level shows a recent streptococcal infection, such as a sore throat or skin infection. It is mainly used when a complication of such an infection is suspected.

ASO Titre Test normal range

Laboratories set their own upper limit. ASO rises one to three weeks after the infection and peaks at about three to five weeks, so a repeat test two weeks later showing a rise is more informative than a single value.

Ranges differ between laboratories and methods. The reference range printed on your own report is the one to read your result against.

What your ASO Titre Test result means

Normal

No evidence of a recent streptococcal infection. Some people, especially after skin infections, do not make much ASO, so another antibody test (anti-DNase B) may be used.

Raised

Shows a recent streptococcal infection. It supports, but does not by itself diagnose, rheumatic fever or post-streptococcal kidney disease.

One result is not a diagnosis. A doctor reads it with your symptoms, history, medicines and other tests.

Why is the ASO Titre Test done?

• Suspected rheumatic fever, with joint pain or a heart murmur after a sore throat
• Suspected post-streptococcal glomerulonephritis, with swelling or cola-coloured urine
• Evidence of a recent streptococcal infection for the Jones criteria

What does the ASO Titre (Antistreptolysin O) measure?

1 parameter. Expand a group to see the measurements, units and available method details.

The reference interval printed on your actual laboratory report governs interpretation. Intervals can vary by laboratory, method, age, sex and pregnancy. Methods can also vary by processing laboratory.

ASO Titre Test: sample & preparation

Sample: Blood. Fasting: Not required.

• You do not need to fast for this blood test.

Frequently asked questions