ASO Test in Chennai

What is the ASO Test and Why is it Performed?

The Antistreptolysin O (ASO) test detects antibodies your immune system produces after exposure to group A Streptococcus (GAS) bacteria, commonly responsible for infections like strep throat, scarlet fever, or skin infections. These antibodies typically rise 1–4 weeks after infection, peak at 3–6 weeks, and gradually decline over months.

• Doctors recommend this test when investigating complications that may follow an untreated or incompletely treated streptococcal infection, such as:
• Acute rheumatic fever (affecting heart valves, joints, skin, and brain)
• Post-streptococcal glomerulonephritis (kidney inflammation)
• Other rare sequelae like certain neuropsychiatric conditions in children

It is not used to diagnose active strep throat (throat swab or rapid antigen test is preferred for that) but supports diagnosis of post-infectious conditions.

How is the ASO Test Performed?

A small blood sample is drawn from a vein, usually in the arm.

No special preparation is needed (fasting is not required).

The sample is analysed using reliable methods like latex agglutination or nephelometry.

Results are typically available within the same day or next day at Unittas Hospital.

Understanding Your ASO Test Results

Negative or low result (within normal range): Suggests no recent streptococcal infection or that antibody levels have returned to baseline.

Elevated result: Indicates a recent (or sometimes past) group A streptococcal infection. A single high value is supportive but often confirmed with rising titres on repeat testing (e.g., 10–14 days apart).

ASO test positive means recent exposure to group A Streptococcus bacteria, even if the original infection caused no noticeable symptoms. It does not confirm an active infection but points to possible post-streptococcal issues when combined with clinical signs.

ASO test positive treatment focuses on managing any resulting complications rather than the antibody level itself. If rheumatic fever or glomerulonephritis is diagnosed, treatment may include:

• Antibiotics (e.g., penicillin) to eradicate any lingering bacteria and prevent recurrence
• Anti-inflammatory medications (e.g., aspirin or corticosteroids) for symptom control
• Long-term prophylactic antibiotics in cases of rheumatic heart disease
• Supportive care for affected organs (heart monitoring, kidney function support)
• Early diagnosis and appropriate management are key to preventing long-term damage.

Why Choose Unittas Hospital?

Unittas Multispeciality Hospital is a NABH-accredited centre with branches in Tambaram and Kelambakkam, conveniently located for patients across Chennai and the OMR corridor. Our state-of-the-art in-house laboratory features advanced analysers for precise diagnostic testing, supported by experienced pathologists and specialists who deliver expert interpretation and personalised guidance.

We ensure quick turnaround with same-day or next-day results in most cases, comfortable phlebotomy areas, private spaces for result discussions, and seamless connections to specialist consultations — all in a single facility. With a strong emphasis on compassionate, patient-focused care, hygienic premises, and flexible timings, Unittas is a trusted choice for reliable diagnostics in Chennai.