ASO (Anti-Streptolysin O)
Uncover a hidden or recent strep infection.
What’s tested
Pick a time
The Anti-Streptolysin O (ASO) test measures the level of antibodies to streptolysin O in the blood. Streptolysin O is a substance produced by Streptococcus pyogenes (group A streptococcus), the bacterium responsible for infections such as strep throat, scarlet fever, and certain skin infections. When the body is exposed to this bacterium, the immune system produces ASO antibodies in response. A raised or rising ASO level can therefore indicate a recent streptococcal infection, even after the infection itself has cleared.
The test is most useful for diagnosing conditions caused by an immune reaction following a streptococcal infection, including:
- Rheumatic fever: an inflammatory condition that can affect the heart, joints, and other tissues.
- Acute glomerulonephritis: inflammation of the kidneys that can develop after a streptococcal infection.
- PANDAS: paediatric autoimmune neuropsychiatric disorders associated with streptococcus.
No special fasting required. Drink plenty of water prior to your appointment for a smooth blood draw.
- Identification: Photo ID (Passport or Driving Licence) is only required if you need your report for official, employment, visa/travel, premarital, or Identity-Verified Certificate (IVS) purposes (not required for personal health & wellness testing).
This test provides an official, quality-assured laboratory report with reference ranges. These results are for clinical information and do not replace your GP or consultant. Always discuss abnormal results with your GP or specialist in the context of your medical history.
WhatsApp →
