A negative ASO level or a very low ASO level means that you probably haven’t had a strep infection recently. Your body starts producing ASO antibodies between a week and a month after you’re infected. Three to five weeks after you develop the illness, you will have the most antibodies in your blood.
What is ASO titre normal range?
Streptolysin O Titre
| Alternative name: | ASO, ASO Ab |
|---|---|
| Reference range: | <200IU/mL |
| Assay range Notes: | 200-400IU/mL High normal range Assay range 0-5000 IU/ml |
| Turnaround time: | 5 – 7 days |
| Analysing laboratory: | Immunology The James Cook University Hospital |
What titer is significant for streptococcal infection?
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 is ASO titre test for?
Antistreptolysin O (ASO) titer is a blood test to measure antibodies against streptolysin O, a substance produced by group A streptococcus bacteria. Antibodies are proteins our bodies produce when they detect harmful substances, such as bacteria.
What happens if ASO titre is high?
An elevated titer of antibody (positive ASO) or an ASO titer that is rising means that it is likely that the person tested has had a recent strep infection. ASO titers that are initially high and then decline suggest that an infection has occurred and may be resolving.
What does a negative ASO titer result mean?
A negative result means that you have no antibodies to the strep bacteria in your blood. 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.
What do the results of my Aso test mean?
Ask your healthcare provider what your test results mean for you. A negative result means that you have no antibodies to the strep bacteria in your blood. 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.
What does Aso stand for?
An antistreptolysin O titer (ASO) is a blood test used to determine if you’ve had a recent infection caused by group A streptococcus bacteria. It’s not used to diagnose a current strep infection,…
When do Aso titres return to baseline levels?
ASO titres return to baseline levels in 23 months. Average ASO baseline levels in adults are half those in children due to the frequent streptococcal throat infections in the latter.
