Antistreptolysin O (ASO) Antibodies Test

The Antistreptolysin O (ASO) test is a blood test that detects antibodies your body produces in response to an infection with group A Streptococcus bacteria. It helps determine whether a recent strep infection might have triggered complications in the body.

What is Antistreptolysin O (ASO)?

• Streptolysin O is a toxin produced by group A Streptococcus bacteria.

• The body responds by making antibodies called ASO antibodies.

• Measuring ASO levels in the blood shows if the body has recently fought a strep infection, even if symptoms are gone.

Why Antistreptolysin O (ASO) Antibodies Test Is Ordered?

1. Suspected post-streptococcal complications

• Rheumatic fever (can affect heart, joints, brain, skin)

• Post-streptococcal glomerulonephritis (kidney inflammation)

2. History of recent strep infection

• Sore throat (pharyngitis)

• Skin infections (impetigo)

• Often used when complications appear weeks after the infection

3. Recurrent infections or unexplained symptoms

• Fever of unknown origin

• Joint pain or swelling

• Heart murmurs

More about Antistreptolysin O (ASO) Antibodies Test in Kasaragod

The ASO test is primarily used to detect a recent strep infection and help evaluate whether post-streptococcal complications like rheumatic fever or kidney inflammation may be developing.