Streptococcal screen

Definition

A streptococcal screen is a test to detect streptococcal pharyngitis from a throat swab.

How the test is performed

The test requires a throat swab. Antibody-antigen technology is used to identify the presence of group A streptococcus from the swab. The test takes about 7 minutes. A culture for group A streptococcus is often done at the same time, because the rapid test may miss some infections.

How to prepare for the test

There is no special preparation. Inform the health care provider if you are taking, or have recently taken, antibiotics.

How the test will feel

Your throat will be swabbed in the area of the tonsils. This may make you gag.

Why the test is performed

The test is performed when strep throat is suspected or when symptoms of pharyngitis (sore throat) are present.

Normal Values

Group A streptococcus is not present.

What abnormal results mean

Group A streptococcus is present (confirms strep throat).

What the risks are

There are no risks.

Special considerations

This test screens for the group A streptococcus organism only and will not detect other causes of sore throat.

Illustrations

Throat anatomy

Throat swabs

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Rapid strep test ; rapid strep test