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Test Name:
Streptococcus, Group A, Antigen Screen, with Culture if Negative, Throat
- SBMF No:
21125 - Performance Lab Name:
Microbiology - Test Mnemonic:
STREP A AG - ABN:
Not required - CPT Code:
87880
If indicated, add 87081 - LOINC Code:
6556-5 - Test Includes:
Ag test with culture if negative. - Also Known As:
Strep A Antigen Screen
Antigen Screen, Group A Strep
Screen for Strep, Group A, Respiratory - Also See:
21029 Culture, Hemolytic Strep only, Throat - Spec Type:
Throat swabs - Spec Container:
Sterile swabs from "Culture Collection/Transport System" - Pref Vol:
Two (2) swabs - Min Vol:
One (1) swab - Fasting:
No - Spec Collect:
Do not obtain throat samples if epiglottis is inflamed, since touching inflamed epiglottis may precipitate complete obstruction of the airway
Use tongue depressor to gently depress tongue
Extend swab between tonsillar pillars and behind uvula; avoid touching cheeks, tongue, uvula, or lips
Any exudate should be touched
Sample posterior pharynx in addition to posterior nares
Insert swab into transport tube and ensure contact with media
Follow manufacturers directions for release of media within transport tube - Spec Store Transport:
Room temperature - Spec Stability:
24 hours room temperature (20-30°C) – do not refrigerate - Spec Reject:
Dry swab
Sample collected with the following transport systems is not acceptable: charcoal agar or semi-solid transport media; calcium alginate or cotton-tip swabs; wooden shafted swabs - Methodology:
Lateral-Flow Immunoassay - Use:
Identify Group A beta-hemolytic streptococci
Antigen establishes the diagnosis of Strep throat - Clinical Significance:
Aids in diagnosis of Strep throat - Reference Range:
Negative for Group A Strep - Critical High Value:
Positive for Group A Strep - Day Run:
Sun-Sat (daily) - Time Run:
As received - Time Reported:
4:00 pm and 11:30 pm
Final after 24 hours - Test Type:
INFECTIOUS ORGANISM
