ASO Titre in Siliguri
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 Siliguri
Tapadia Diagnostic Centre in Siliguri 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 Siliguri center. Pay at the centre with no advance payment. Book online or visit us.
Frequently asked questions
Related Pathology Tests in Siliguri
Centers You Can Choose To Visit
ASO Titre in Siliguri
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 Siliguri
HIV 1 & 2 Antibodies, Serum-Elisa Method in Siliguri
Dengue IgG, IgM Antibodies + NS1 Antigen-Rapid, Serum in Siliguri
Lipoprotein A (Lp A), Serum in Siliguri
Erythrocyte Sedimentation Rate (ESR) in Siliguri
Thyroxine Total (T4), Serum in Siliguri
Triiodothyronine Total (T3), Serum in Siliguri
CA 19.9 (Pancreatic Cancer Marker), Serum in Siliguri
NIPT with Microdeletions in Siliguri
NIPT Basic in Siliguri
Complete Blood Picture (CBP) in Siliguri
Serum Phosphorus Test in Siliguri
TIBC in Siliguri
Urology Profile in Siliguri
Beta HCG Free, Serum (Pregnancy Test) in Siliguri
Viral Screening in Siliguri
AFP Test in Siliguri
Microalbuminuria test in Siliguri
Diabetes Testing (FBS + PLBS) in Siliguri
Antithrombin III in Siliguri
D-dimer test in Siliguri
Creatine Kinase (CK) Test in Siliguri
AST Test in Siliguri
Cardiac Markers in Siliguri
Pap Smear - LBC in Siliguri
DVT Profile in Siliguri
Bleeding Time and Clotting Time (BT & CT) in Siliguri
Estradiol Test in Siliguri
hs-CRP Test in Siliguri
Alkaline Phosphatase (ALP) Test in Siliguri
Fertility Profile in Siliguri
Albumin blood test in Siliguri
Troponin T in Siliguri
Infertility Profile Extended in Siliguri
Electrolyte Panel in Siliguri
Anticardiolipin Antibodies (IgG) in Siliguri
PSA Test in Siliguri
FSH Test in Siliguri
STD Panel in Siliguri
PCOS Profile in Siliguri
Serum Iron Test in Siliguri
Cardiac Profile-III in Siliguri
Plasma Fibrinogen Test in Siliguri
HBsAg Test in Siliguri
Cardiac Biomarker Test in Siliguri
Herpes Simplex Virus (HSV) Types 1 and 2 Antibody Test in Siliguri
Antenatal Profile in Siliguri
Activated Partial Thromboplastin Time in Siliguri
Lipid Panel in Siliguri
Fine Needle Aspiration Cytology in Siliguri
CRP test in Siliguri
Joint Pain / SLE / Collagen Profile-I in Siliguri
PAPP-A Test in Siliguri
Insulin Test in Siliguri
Triple Screen Test in Siliguri
Anti-HCV Test in Siliguri
Basic Metabolic Panel (BMP) in Siliguri
Very low-density lipoprotein (VLDL) test in Siliguri
Free Testosterone in Siliguri
Triglycerides Test in Siliguri
Quad Screen in Siliguri
Folic Acid in Siliguri
Urinalysis in Siliguri
CEA Test in Siliguri
Ferritin Test in Siliguri
Transferrin Saturation% in Siliguri
Protein C Antigen in Siliguri
Alpha Feto Protein (AFP) - Fluid in Siliguri
CPK (MB) Test in Siliguri
Lupus Anticoagulant Testing in Siliguri
Reticulocyte Count in Siliguri
Infertility Profile-Basic in Siliguri
Beta hCG Test in Siliguri
DIABETIC PROFILE in Siliguri
LH Test in Siliguri
Anti-Müllerian Hormone (AMH) Test in Siliguri
Bile Salts and Bile Pigments, Urine in Siliguri
HbA1c in Siliguri
Vitamin D (1,25-Dihydroxyvitamin D) in Siliguri
Liver Function Test (LFT) in Siliguri
Anemia Profile Basic in Siliguri
Rheumatoid Factor in Siliguri
Widal Test in Siliguri
Bilirubin blood test in Siliguri
Inhibin A, Tumor Marker, Serum in Siliguri
Thyroid Function Tests in Siliguri
eGFR in Siliguri
Menopause Profile in Siliguri
EXTENDED DIABETIC PROFILE in Siliguri
LDH Test in Siliguri
Total Cholesterol Test in Siliguri
Random Blood Sugar Test in Siliguri
Total Protein Test in Siliguri
RPR test in Siliguri
Anti-dsDNA Test in Siliguri
HDL Cholesterol in Siliguri
Blood Type Test in Siliguri
ASO Titre in Siliguri
Blood Urea(Serum) Test in Siliguri
Postprandial Blood Sugar Test in Siliguri
Back Pain Profile in Siliguri
ANA test in Siliguri
Serum Creatinine Test in Siliguri
PT/INR Test in Siliguri
Fasting Blood Sugar Test in Siliguri
Extended Anemia Profile III Executive in Siliguri
Kidney Function Test (Renal Profile) in Siliguri
Serum Magnesium Test in Siliguri
Well-woman exam in Siliguri
LDL cholesterol test in Siliguri
Prolactin Test in Siliguri
Malaria Blood Smear in Siliguri
Liver Function Test (+GGT) in Siliguri
TPHA Test in Siliguri
Hepatitis B Surface Antigen (HBsAg) Test in Siliguri
Antenatal Profile 2 in Siliguri
TSH Test in Siliguri
Cardiac Catheterization in Siliguri
Cardiolipin Antibody (IgM) in Siliguri
Master Health Checkup (BL+RADIO) in Siliguri
Calcium Profile in Siliguri
Coagulation Profile in Siliguri
Uric Acid Test in Siliguri
Vitamin D (25 - Hydroxy Vitamin D, Serum) in Siliguri
Globulin Test in Siliguri
Fever Profile Test in Siliguri
Connective Tissue Disease Profile in Siliguri
Calcium Blood Test in Siliguri
IHC in Siliguri
Estriol Unconjugated (E3) Test in Siliguri
Blood Typing in Siliguri
Vitamin B12 Test in Siliguri
Serum Cortisol in Siliguri
Double Marker Test in Siliguri
Pap Smear, Conventional in Siliguri
Protein S Activity in Siliguri
Non-Invasive Prenatal Testing (NIPT) in Siliguri
whole exome sequencing in Siliguri
Newborn Screening (NBS) in Siliguri
Apolipoprotein A1 (Apo A1), Serum in Siliguri
Apolipoprotein B (Apo B), Serum in Siliguri
Renal Function Test (RFT) in Siliguri
