Mar 29, 2016




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Strep A Screen, Rapid Ag, Culture if Neg

Strep A Screen, Rapid Ag, Culture if Neg (RAPDSC) KITS Lab Test

Name: Strep A Screen, Rapid Ag, Culture if Neg

Test Name: Strep A Screen, Rapid Ag, Culture if Neg

Health Link Test Code: RAPDSC


CPT Code(s): 87880

Methodology: Immunoassay

Clinical Information:

Rapid screening for Group A Streptococci from throat swabs. Culture on adult patients may not be needed. Consider ordering Strep A Screen, Rapid Ag [RAPD] instead.

Days Performed: Daily, 24 hours.

In-Lab Turnaround Time: 4 hours.

Stat In-Lab Turnaround Time: 1 hour.

Specimen: Pharyngeal swab

Collection Container: 2 CultureSwabs®

Collection Instructions:

Use standard specimen collection techniques. Culture swabs can be obtained from UWHC Central Supply. The double swab required for this test is CS item #4005445. If using single swab culturettes (CS item #1220190), please submit two.

Stability Ambient:

48 hours

Stability Refridgerated:

48 hours

Stability Frozen:

Not acceptable

Specimen Transport:

Store swabs in tightly capped tube. Transport to laboratory.

Unacceptable Criteria:

Frozen swabs, swabs with calcium alginate or cotton tips or wooden shafts, and specimens greater than 72 hours post collection are not acceptable.


This is a screening test only. A negative result may indicate either that the specimen obtained was negative for the presence of Group A Streptococci or that the amount of antigen extracted from the specimen is less than the analytical sensitivity of the test. The result should be interpreted in conjunction with clinical and other data available to the clinician. All specimens that test negative are sent to the UWHC Microbiology Lab for a Strep Culture.

Additional Information:

Culture on adult patients may not be needed.  The Infectious Diseases Society of America (IDSA) practice guidelines (2002) state that, because of the reduced sensitivity of rapid antigen tests and the importance of accurate detection, predominantly for prevention of rheumatic heart disease, culture confirmation of negative rapid antigen tests is recommended for pediatric patients.


The risk of infection is apt to be higher for parents of school-aged children and for adults whose occupation brings them into close association with children.