Anti Streptolysin O Titer

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3.8
NABL, CAP, ISO
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Overview
Interpretations
FAQ's
Anti Streptolysin O  Titer

Overview of Anti Streptolysin O Titer

What is Anti Streptolysin O Titer?

Antistreptolysin O or ASO is an antibody produced against Streptolysin O, a toxin secreted by Group A Streptococcus bacteria. The ASO Titer Test detects and measures the level of ASO in blood to determine the presence of an infection by Group A Streptococcus bacteria.

Sample Type

The sample type collected for Anti Streptolysin O Titer is: Blood

Preparation for Anti Streptolysin O Titer

  • No special preparation required

Why Get Tested for Anti Streptolysin O Titer?

The ASO Titer Test is performed:

·         To help determine if conditions like rheumatic fever or glomerulonephritis have occurred as complications of a Streptococcus infection

·         To determine the presence of a Streptococcus infection in case the patient has received antibiotics




Understand more about Anti Streptolysin O Titer

Streptococcus pyogenes or Group A Streptococcus is a bacteria which causes a number of infections like throat infections, skin infections like pyoderma, etc. These infections are easily recognizable and treated with the help of antibiotics. However, if the Streptococcus infection is left untreated or improperly treated, it may lead to complications like rheumatic fever, glomerulonephritis, scarlet fever, heart and kidney damage, joint inflammation, swelling etc.

Symptoms caused by an infection of Group A Streptococcus bacteria are caused mainly due to a toxin called Streptolysin O which is secreted by these bacteria. The body produces antibodies against Streptolysin O called Antistreptolysin O (ASO). ASO antibodies are produced by the body a week to a month after an infection. Levels peak after about 3 to 5 weeks after the condition develops, after which they slowly taper off as the condition resolves. Increase in ASO levels is greater in case of throat infections than in skin infections. The ASO Titer Test is performed to measure the levels of ASO in blood to help diagnose a Streptococcus infection and complications which may have arisen from the infection.


What Results of Anti Streptolysin O Titer mean?

Interpretations

Normal ASO level:

Children (up to 12 years of age): Below 150 IU/ml

Adults (above 12 years of age): Below 200 IU/ml

Higher than normal ASO levels indicates an infection of Streptococcus bacteria.

Low ASO titer indicates no recent infection which is confirmed if the low levels persist in the subsequent test performed after 10 to 15 days. Other tests like Anti-DNase B Test can also be performed.

Higher than normal ASO titer levels and continuously rising ASO titer in subsequent tests indicates a recent and ongoing infection.

High ASO levels which decline subsequently indicate a Streptococcus infection which is resolving or being cured.

A positive result in the ASO test (Higher than normal ASO levels) confirms a past Streptococcal infection. A positive result can thus help in the diagnosis of conditions like Poststreptococcal Glomerulonephritis (PSGN), Pediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcus (PANDAS), and rheumatic fever.

Note: ASO Test results may be negative (within normal range) in upto 20% of patients suffering from Acute Rheumatic Fever (ARF). Other tests may be performed to confirm the condition in these cases.


Patient Concerns about Anti Streptolysin O Titer

Frequently Asked Questions about Anti Streptolysin O Titer

Q. How is this test performed?
This test is performed on a blood sample. A syringe with a fine needle attached is used to withdraw blood sample from a blood vessel in your arm generally from the inner side of the elbow area. The doctor, nurse or the phlebotomist will tie an elastic band around your arm which will help the blood vessels to swell with blood and hence makes it easier to withdraw blood. You may be asked to tightly clench your fist. Once the veins are clearly visible, the area is cleaned with an antiseptic solution and then the needle is inserted into the blood vessel to collect the sample. You may feel a tiny pinprick during the procedure. Blood sample once collected is then sent to the laboratory.
Q. Is there any risk associated with this test?
There is no risk associated with the test. However, as this test involves a needle prick to withdraw the blood sample, rarely, a patient may experience increased bleeding, hematoma (blood collection under the skin) formation, bruising or infection at the site of needle prick.
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Provided By

NABL

CAP

ISO

Thyrocare Technologies Limited is India's first and most advanced Totally Automated Laboratory having its strong presence in more than 2000 cities / towns in India and internationally. Thyrocare is India's first fully automated diagnostic laboratory with a focus on providing quality at affordable costs to laboratories and hospitals in India and other countries. Thyrocare operates with a Centralized Processing Laboratory (CPL) in Mumbai - India for esoteric tests; and Regional Processing Laboratory in major metro cities of India and other parts of Asia. We have focus on strong technologies, strong brands and strong systems that enable all laboratories to give their clients the best of science and technology at an affordable cost. With a belief that 'Quality' is the heart of any intelligent management, Thyrocare became one of the first Indian diagnostic laboratories to obtain internationally renowned quality accreditations like ISO 9001-2000 rating as early as 2001, which is now escalated to ISO 9001:2008; NABL (National Accreditation Board for Testing and Calibration Laboratories) in 2005 and CAP (College of American Pathologists) certification in 2007.
User Reviews
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Sheetal Singhvi
Service was very excellent
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Hemant
Best service. On time delivery if reports. They did what they said.
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