What Is Group A Streptococcus (Strep A)?
What it is
Streptococcus pyogenes antigen
Why it matters
Rapid diagnosis of strep throat.
Specimen
Swab
Interpretation
Positive = Strep A present
Limitations
Culture is reference
Related test: Strep A Rapid Test — specimen: Throat swab
Frequently Asked Questions
What does a positive Strep A test mean? Group A Streptococcus is present — culture is the reference.
Related knowledge
References
- IDSA. Group A streptococcal pharyngitis guideline.
Last reviewed: 2026-09-12