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Definition

Antistreptolysin O (ASO) titer is a blood test to measure antibodies against streptolysin O, a substance produced by Group A Streptococcus bacteria.

Alternative Names

ASO titer; ASLO

How the test is performed

Blood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood.

Next, the health care provider gently inserts a needle into the vein. The blood collects into an airtight vial or tube attached to the needle. The elastic band is removed from your arm. Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.

In infants or young children, a sharp tool called a lancet may be used to puncture the skin and make it bleed. The blood collects into a small glass tube called a pipette, or onto a slide or test strip. A bandage may be placed over the area if there is any bleeding.

The blood is then sent to the laboratory for analysis.

How to prepare for the test

You should not eat for 6 hours before the test.

How the test will feel

When the needle is inserted to draw blood, you may feel moderate pain, or only a prick or stinging sensation. Afterward, there may be some throbbing.

Why the test is performed

This test is used to detect prior infection by Group A Streptococcus, the bacteria responsible for diseases such as:

The ASO antibody may be found in the blood weeks or months after the strep infection has gone away.

Normal Values

Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

What abnormal results mean

Abnormal results may be due to:

What the risks are

Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.

Other risks associated with having blood drawn are slight but may include:

  • Excessive bleeding
  • Fainting or feeling light-headed
  • Hematoma (blood accumulating under the skin)
  • Infection (a slight risk any time the skin is broken)
References

Bisno AL, Stevens DL. Streptococcus pyogenes. In: Mandell GL, Bennett JE, Dolin R, eds. Principles and Practice of Infectious Diseases. 7th ed. Philadelphia, Pa: Elsevier Churchill Livingstone; 2009:chap 198.

Bisno AL. Nonsuppurative poststreptococcal sequelae: Rheumatic fever and glomerulonephritis. In: Mandell GL, Bennett JE, Dolin R, eds. Principles and Practice of Infectious Diseases. 7th ed. Philadelphia, Pa: Elsevier Churchill Livingstone; 2009:chap 199.

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Related Questions

What is the purpose of the antistreptolysin O titer?

to determine whether a previous group A Streptococcus infection has caused a poststreptococcal disease, such as scarlet fever, rheumatic fever, or a kidney disease called glomerulonephritis.


What does the medical abbreviation ASO mean?

ASO stands for antistreptolysin-O, which is an antibody your body makes against streptococcus bacteria.


How much does a titer test cost?

Plenty o' green


Your result of widal test is antigen O.180 antigen H.. 1160 antigen A.. no titer antigen B.. no titer What is the meaning of this results?

you might be suffering from typhoid fever as o antigen more than 100 and h antigen more than 200 are significant consult your doctor immediately for proper treatment dr.mahwash


What if salmonella typhi O is 1320?

The Widal test is a presumptive (positive) serological test for enteric fever or undulant fever (typhoid fever) if the antigen titer is more than 1:160 and if the person tested had past infections or is immunized. More tests should be done since it is now 1:320. If the next titer comes back 4x higher, then the person has an active case of typhoid fever.


In which conditions is ASO titer raised?

ASO (Anti-streptolysin O) titers are raised in conditions such as streptococcal infections, rheumatic fever, and post-streptococcal glomerulonephritis. These conditions are typically associated with an immune response to Group A Streptococcus bacteria.


What the procedure of widal test?

1)prepare the blood plate(black background). 2)add one drop serum 3)add antigen (o,H,AH,BH) 4)mix the antigen and serum. 5)rotate the sample (1 min) 6)result:positive reactive :negative non-reactive


What are causes of Antistreptolysin O Titre and what are its side effects and how long does it takes to cure?

This test shows a past infection of Group A Streptococcal bacteria, which can cause a sore throat and is seen fairly commonly in children. It will go away by itself and doesn't normally need medication. There is a possible, rare complication that may occur that affects the kidneys called post-streptococcal glomerulonephritis. Watch out for any swelling, lower back pain, difficulty urinating or feeling tired.


What is serology in immunology?

Serology (ser -> serum; ology -> study of) is the set of experiments and tests that can be done using serum. Serum is the non-cellular component of blood. That is, it's the liquid (with all its lipids and proteins) that is left over after all the red and white blood cells have been removed. Serology could involve the measurement of antibody titers (amounts) or cytokine concentrations.


What is the Treatment for a high aso titer?

This is a serologic test, known as anti-streptolysin O. It measures the quantity of antibody to a component of streptococcal bacteria. This test is useful in diagnosing scarlet fever, rheumatic fever and other streptococcal disease. Treatment would depend on which particular malady needs to be dealt with.


What is a TORCH test used for?

The TORCH test measures the levels of an infant's antibodies against five groups of chronic infections: t oxoplasmosis, o ther infections, r ubella, c ytomegalovirus (CMV), and h erpes simplex virus (HSV).


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