ASO Titre in Trichy
Also called: ASO titer, ASLO, Strep A antibody test
Report
{context.blood_test.parameters} Parameters
The test at a glance
What it checks
Report delivery
Test for
Age group
Commonly advised for
What is a ASO Titre ?
Understanding The Antistreptolysin O (ASO) Titre
The Antistreptolysin O (ASO) Titre is a blood test used to detect a recent infection by Group A Streptococcus bacteria. Unlike a throat culture, which diagnoses an active strep throat infection while it is happening, the ASO Titre looks for the aftermath. It measures antibodies the body produces against "Streptolysin O," a toxic enzyme released by the bacteria. This test is primarily ordered when a patient presents with symptoms of complications that occur weeks after a strep infection—specifically Rheumatic Fever (which affects the heart and joints) or Post-Streptococcal Glomerulonephritis (a kidney disease). It is a vital tool for connecting current unexplained symptoms (like joint pain or kidney issues) to a past, perhaps untreated, strep infection.
Components Measured:
The test focuses on a specific immune marker:
Antistreptolysin O Antibodies: These are proteins created by the immune system to neutralize the toxins produced by Group A Strep bacteria.
Titre Level: The test measures the amount (titre) of these antibodies in the blood. A higher number indicates a stronger immune response, suggesting a recent or severe infection. The antibodies typically appear 1 to 3 weeks after the initial infection, peak around 3 to 5 weeks, and then gradually decline over months.
Preparation:
Preparation for an ASO Titre is simple and generally requires no special changes to your routine.
Fasting: Fasting is usually not required. You can eat and drink normally before the test.
Medications: Inform your doctor about any medications you are taking, particularly corticosteroids or antibiotics, as these can suppress the immune system and potentially lower antibody levels, leading to a false-negative result.
Recent Illness: Let the doctor know if you have had a sore throat or skin infection in the last few months, even if it seemed mild.
Procedure:
The test is a standard venous blood draw that takes only a few minutes:
A healthcare professional selects a vein, typically in the inner elbow.
The area is cleaned with an antiseptic to prevent infection.
An elastic band (tourniquet) is tied around the arm to swell the veins with blood.
A needle is inserted, and a small amount of blood is collected into a tube.
The needle is removed, and a cotton ball or bandage is applied to the site.
The sample is sent to a laboratory where it is tested for the reaction between your serum and the streptolysin antigen.
Risks:
The risks associated with an ASO Titre test are minimal:
Bruising: Minor bruising at the needle site is common but harmless.
Pain: A slight pinch during needle insertion and mild soreness afterward.
Infection: Extremely rare risk of infection at the puncture site.
Fainting: Some patients may feel lightheaded during the blood draw.
Normal Ranges:
Results are measured in International Units per milliliter (IU/mL). Reference ranges can vary slightly between laboratories, but general guidelines are:
Adults: A test is usually considered negative (normal) if the level is below 200 IU/mL.
Children (School-aged): Because children are exposed to strep bacteria more frequently, their "normal" baseline is higher. A level below 400 IU/mL is often considered normal for children (especially ages 5–15).
Infants/Toddlers: Levels are typically very low, similar to adults, as they have had less exposure.
Interpretation:
A doctor interprets ASO results in conjunction with physical symptoms. A single test result is often not enough to confirm a diagnosis; doctors look for patterns.
Negative (Low) Titre: Indicates you likely have not had a strep infection recently. However, if symptoms are strong, the doctor may repeat the test in 10 days to see if levels rise (seroconversion).
Elevated or Rising Titre: This is clinically significant.
Rheumatic Fever: High ASO combined with joint swelling, fever, or heart murmurs suggests Rheumatic Fever.
Glomerulonephritis: High ASO combined with blood in urine, swelling (edema), or high blood pressure suggests post-streptococcal kidney inflammation.
False Positives/Negatives: ASO levels might not rise if the infection was on the skin (impetigo) rather than the throat, or if antibiotics were taken early. Conversely, levels can remain elevated for months after an infection has cleared, so a high number doesn't always mean the disease is currently active—it just means it was there.
Who should take this test
The ASO Titre checks for a past throat infection with a streptococcus germ. It is advised if:
- You have joint pain and swelling after a sore throat
- You have long-standing fever with joint symptoms
- Your doctor suspects rheumatic fever
- There is a known heart valve problem under review
- A child has repeated sore throats with joint pain
ASO Titre testing in Trichy
Tapadia Diagnostic Centre in Trichy offers NABL-accredited ASO Titre test from a Blood sample(s). ASO titer, ASLO, Strep A antibody test is also prescribed for Fever, joint pain, chest pain, swelling, shortness of breath. Established in 1989, this doctor-led diagnostic centre ensures high accuracy. Home sample collection and walk-in facility available at our Trichy center. Pay at the centre with no advance payment. Book online or visit us.
Frequently asked questions
Related Pathology Tests in Trichy
Centers You Can Choose To Visit
ASO Titre in Trichy
Rated 4.6 on Google
From 6,477 patient reviews across our Hyderabad centres.
Every report, kept for you
Past reports stay in your account and can be downloaded again.
NABL accredited
Every result reviewed by a qualified pathologist before it reaches you.
Four decades of practice
A family-run diagnostic centre, trusted by doctors and households since 1989
Medically Reviewed by Qualified Biochemists
ASO Titre in Other Cities
Master Health Checkup (Blood) in Trichy
HIV 1 & 2 Antibodies, Serum-Elisa Method in Trichy
Dengue IgG, IgM Antibodies + NS1 Antigen-Rapid, Serum in Trichy
Lipoprotein A (Lp A), Serum in Trichy
Erythrocyte Sedimentation Rate (ESR) in Trichy
Thyroxine Total (T4), Serum in Trichy
Triiodothyronine Total (T3), Serum in Trichy
CA 19.9 (Pancreatic Cancer Marker), Serum in Trichy
NIPT with Microdeletions in Trichy
NIPT Basic in Trichy
Complete Blood Picture (CBP) in Trichy
Serum Phosphorus Test in Trichy
TIBC in Trichy
Urology Profile in Trichy
Beta HCG Free, Serum (Pregnancy Test) in Trichy
Viral Screening in Trichy
AFP Test in Trichy
Microalbuminuria test in Trichy
Diabetes Testing (FBS + PLBS) in Trichy
Antithrombin III in Trichy
D-dimer test in Trichy
Creatine Kinase (CK) Test in Trichy
AST Test in Trichy
Cardiac Markers in Trichy
Pap Smear - LBC in Trichy
DVT Profile in Trichy
Bleeding Time and Clotting Time (BT & CT) in Trichy
Estradiol Test in Trichy
hs-CRP Test in Trichy
Alkaline Phosphatase (ALP) Test in Trichy
Fertility Profile in Trichy
Albumin blood test in Trichy
Troponin T in Trichy
Infertility Profile Extended in Trichy
Electrolyte Panel in Trichy
Anticardiolipin Antibodies (IgG) in Trichy
PSA Test in Trichy
FSH Test in Trichy
STD Panel in Trichy
PCOS Profile in Trichy
Serum Iron Test in Trichy
Cardiac Profile-III in Trichy
Plasma Fibrinogen Test in Trichy
HBsAg Test in Trichy
Cardiac Biomarker Test in Trichy
Herpes Simplex Virus (HSV) Types 1 and 2 Antibody Test in Trichy
Antenatal Profile in Trichy
Activated Partial Thromboplastin Time in Trichy
Lipid Panel in Trichy
Fine Needle Aspiration Cytology in Trichy
CRP test in Trichy
Joint Pain / SLE / Collagen Profile-I in Trichy
PAPP-A Test in Trichy
Insulin Test in Trichy
Triple Screen Test in Trichy
Anti-HCV Test in Trichy
Basic Metabolic Panel (BMP) in Trichy
Very low-density lipoprotein (VLDL) test in Trichy
Free Testosterone in Trichy
Triglycerides Test in Trichy
Quad Screen in Trichy
Folic Acid in Trichy
Urinalysis in Trichy
CEA Test in Trichy
Ferritin Test in Trichy
Transferrin Saturation% in Trichy
Protein C Antigen in Trichy
Alpha Feto Protein (AFP) - Fluid in Trichy
CPK (MB) Test in Trichy
Lupus Anticoagulant Testing in Trichy
Reticulocyte Count in Trichy
Infertility Profile-Basic in Trichy
Beta hCG Test in Trichy
DIABETIC PROFILE in Trichy
LH Test in Trichy
Anti-Müllerian Hormone (AMH) Test in Trichy
Bile Salts and Bile Pigments, Urine in Trichy
HbA1c in Trichy
Vitamin D (1,25-Dihydroxyvitamin D) in Trichy
Liver Function Test (LFT) in Trichy
Anemia Profile Basic in Trichy
Rheumatoid Factor in Trichy
Widal Test in Trichy
Bilirubin blood test in Trichy
Inhibin A, Tumor Marker, Serum in Trichy
Thyroid Function Tests in Trichy
eGFR in Trichy
Menopause Profile in Trichy
EXTENDED DIABETIC PROFILE in Trichy
LDH Test in Trichy
Total Cholesterol Test in Trichy
Random Blood Sugar Test in Trichy
Total Protein Test in Trichy
RPR test in Trichy
Anti-dsDNA Test in Trichy
HDL Cholesterol in Trichy
Blood Type Test in Trichy
ASO Titre in Trichy
Blood Urea(Serum) Test in Trichy
Postprandial Blood Sugar Test in Trichy
Back Pain Profile in Trichy
ANA test in Trichy
Serum Creatinine Test in Trichy
PT/INR Test in Trichy
Fasting Blood Sugar Test in Trichy
Extended Anemia Profile III Executive in Trichy
Kidney Function Test (Renal Profile) in Trichy
Serum Magnesium Test in Trichy
Well-woman exam in Trichy
LDL cholesterol test in Trichy
Prolactin Test in Trichy
Malaria Blood Smear in Trichy
Liver Function Test (+GGT) in Trichy
TPHA Test in Trichy
Hepatitis B Surface Antigen (HBsAg) Test in Trichy
Antenatal Profile 2 in Trichy
TSH Test in Trichy
Cardiac Catheterization in Trichy
Cardiolipin Antibody (IgM) in Trichy
Master Health Checkup (BL+RADIO) in Trichy
Calcium Profile in Trichy
Coagulation Profile in Trichy
Uric Acid Test in Trichy
Vitamin D (25 - Hydroxy Vitamin D, Serum) in Trichy
Globulin Test in Trichy
Fever Profile Test in Trichy
Connective Tissue Disease Profile in Trichy
Calcium Blood Test in Trichy
IHC in Trichy
Estriol Unconjugated (E3) Test in Trichy
Blood Typing in Trichy
Vitamin B12 Test in Trichy
Serum Cortisol in Trichy
Double Marker Test in Trichy
Pap Smear, Conventional in Trichy
Protein S Activity in Trichy
Non-Invasive Prenatal Testing (NIPT) in Trichy
whole exome sequencing in Trichy
Newborn Screening (NBS) in Trichy
Apolipoprotein A1 (Apo A1), Serum in Trichy
Apolipoprotein B (Apo B), Serum in Trichy
Renal Function Test (RFT) in Trichy
