Antistreptolysin – O Titer

AsseyMethod: Imm.turb.
Abbrevation: ASO
Sector: Serology
SampleType: S
S.Vol: -
Transport: at 2-8˚c, -20˚c
Storage: 1 day at 2-8˚c,1 week at -20˚c
Test Name: Antistreptolysin – O Titer
Normal Range: Up to 333

This test is related to
Why get tested?

To diagnose a possible bacterial infection of the throat (usually Streptococcus pyogene)

When to get tested?

If you have a sore throat and fever and your doctor thinks it may have a bacterial cause (although most sore throats are caused by viruses and won't require antibiotics)

Sample required?

A swab brushed against your throat and tonsils

Test preparation needed?


What is being tested?

The test identifies Streptococcus pyogenes, known as Group A streptococcus, which are bacteria that infect the back of the throat and are a common cause for an infected and sore throat. Whilst group A Streptococcus is the commonest bacterial cause of a severe sore throat (pharyngitis), it is not the only bacterial cause and others include group C and G streptococcus and arcanobacteria.

How is the sample collected for testing?

The bacteria are tested for by throat culture. Your doctor may use a tongue depressor to hold down your tongue, and then s/he will insert a special swab into your mouth and brush it against your throat and tonsils. The swab will be sent to a laboratory, where culture is performed.

Is any test preparation needed to ensure the quality of the sample?

No test preparation is needed. The test should be performed before antibiotics are prescribed.