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Clear
 
Test Code:
090-40-1030-01

Order Name:
Group A Streptococcal Ag (Dip Stick Method)

 
Useful For:
Screening for Streptococcal group A (Streptococcus pyogenes)
 
Methodology:
Immunochromatographic Assay
 
AliasesName:
Beta-Hemolytic Strep
Beta-Hemolytic Streptococcus
Group A Strep
Group A Streptococcus
Strep Group A
Streptococcus Group A
Streptococcus pyogenes
S. pyogenes

GAS
Beta Strep SGA
 
 
 
Test Code:
090-40-1030-01

Order Name:
Group A Streptococcal Ag (Dip Stick Method)

 
Collection Specimen Or Container:
Throat swab by rayon-tipped Swabs/ Clean and dry Plastic Transport tube
 
Specimen Testing Type:
Throat swab, volume entire collection
 
Sub Mission Container:
Clean and dry Plastic Transport tube
 
Rejection Criteria:
Calcium alginate swab, cotton tipped or wooden shaft swab is not recommend
 
Specimen Stabillity:
Specimen Type Temperature Time
Throat swab Room temperature, 18oC to 25oC 72 hours
Refrigerated, 2oC to 8oC 72 hours
 
 
 
Test Code:
090-40-1030-01

Order Name:
Group A Streptococcal Ag (Dip Stick Method)

 
Method detail:
Immunochromatographic Assay
 
Schedule:
Tested daily (24 hours)
 
Turnaround Time:
Received specimen to report within 1 hour.
 
Performing Location:
Microbiology, Laboratory Department Tel. 14171
 
Specimen Retention Time:
1 day
 
 
 
Test Code:
090-40-1030-01

Order Name:
Group A Streptococcal Ag (Dip Stick Method)

 
 
Clinical Information:
Group A Streptococci are organisms that typically c ause illnesses such as tonsillitis, pharyngitis and scarlet fever. These infections can lead to serious complications, including rheumatic fever and acute glomerulonephritis.1 Rapid diagnosis and appropriate antibiotic therapy of Group A Streptococcal infections appear to be the best means of preventing these complications. The traditional means of detecting Group A Streptococcal infection involves 24-48 hour culture of throat swab specimens or other exudates, confirming beta-hemolysis, and showing susceptibility to bacitracin. Group A, but generally not other groups of beta-hemolytic Streptococci, is bacitracin susceptible which provides a presumptive diagnosis of Group A Streptococcal disease.
 
Reference Value:
Negative
 
Interpretation:
Positive for Group A Streptococcus Respiratory infections, including pharyngitis, can be caused by Streptococcus from serogroups other than group A as well as other pathogens. The test will not differentiate asymptomatic carriers of Group A Streptococcus from those exhibiting Streptococcal infection. In rare cases, test specimens heavily colonized with Staphylococcus aureus(>1010) can yield false positive results. Test results must always be evaluated with other data available to the physician. A negative test result might occur if the level of extracted antigen in a sample is below the sensitivity of the test. Additional follow-up testing using the culture method is recommended if the test result is negative.
 
Clinical Reference:
  1. Manufacturer’s reagent package insert Quidel Strep A test, 0563119EN00 (07/14), Quldel, Germany
  2. https://www.mayocliniclabs.com (Retrieved: 29 Jan 2019)