What is a normal Antistreptolysin level?
Generally, an ASO test value below 200 is considered normal. In children under the age of 5, the test value should be less than 100. Results will vary by laboratory. If your results show that you have an elevated ASO value, you may have a post-streptococcal complication.
What does a positive ASO test mean?
Because it takes time for the number of antibodies to increase in your blood after you are infected, you may need to repeat the ASO titer 2 weeks after your first blood sample. A positive result means that antibodies have been found. This means that you may have had a recent strep infection.
How do you treat antistreptolysin O high?
In most cases, penicillin is used to treat patients with increased levels of ASO titre.
What are Todd units?
Todd unit. The unit in which the results of testing for antistreptolysin O (ASO) are expressed. It denotes the reciprocal of the highest dilution of test serum at which there continues to be neutralization of a standard preparation of the streptococcal enzyme streptolysin O.
Can adults get Sydenham chorea?
It usually develops in children between the ages of 5-15. Rarely, the disorder has been reported in children under age 5 years or in adults. Sydenham chorea affects individuals of all races and ethnicities.
What is cause of rheumatic fever?
Rheumatic fever is caused by a bacterium called group A Streptococcus. This bacterium causes strep throat or, in a small percentage of people, scarlet fever. It’s an inflammatory disorder. Rheumatic fever causes the body to attack its own tissues.
What is anti-streptolysin O (ASO)?
What is Anti-streptolysin O? Anti-streptolysin O (ASO or ASLO) is the antibody made against streptolysin O, an immunogenic, oxygen-labile hemolytic toxin produced by most strains of group A and many strains of groups C and G streptococci. The O in the name stands for oxygen-labile; the other related toxin being oxygen-stable streptolysin-S.
What are Todd units in Streptolysin O?
The presence of antibody in the patient’s serum will inhibit the hemolytic activity of streptolysin O. The test result is reported as the reciprocal of the highest dilution which inhibits hemolysis and is referred to as Todd units. A rise in titer of two or more dilution increments between acute and convalescent specimens is considered significant.
What does the antistreptolysin O titer measure?
The antistreptolysin O titer measures the level of antistreptolysin O antibodies in the blood plasma. These antibodies produced against the bacteria cross-react with human antigens (mainly collagen) and attack the cellular matrix of various organs, mainly the heart and joints.