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Test Code LEGAG Legionella Antigen, Rapid Urinary Antigen

Additional Codes

Epic: LAB886

Specimen Required

Sterile Container

Specimen Minimum Volume

Collection Container/Tube: Sterile urine container
Submission Container/Tube: Sterile container
Specimen Volume: 1.0 mL
Collection Instructions: Collect random urine into a sterile container.

Specimen Stability

Room temperature: 24 hours

Refrigerated: 14 days

Reference Range

Negative for Legionella pneumophila serogroup 1 antigen

Rejection Due To

Rejection will occur for the following reasons: improperly labeled specimen, insufficient volume, specimen not submitted in appropriate transport container, Room temperature urine that arrives >24 hours after collection, Leaking or broken containers

Report Available

1-2 Days

Clinical Significance

A positive test result is a presumed positive for L. pneumophila serogroup 1 antigen in urine, suggesting current or past infection. A Negative result is presumptive negative for L. pneumophila serogroup 1 antigen in urine, suggesting no recent or current infection. Infection due to Legionella cannot be ruled out since other serogroups and species may cause disease, antigen may not be present in the urine in early infection, and the level of antigen present in the urine may be below the detection limit of the test.


This test only detects L. pneumophila serogroup 1 Antigen. It will not detect infections caused by other L. pneumophila serogroups or other Legionella species. A negative antigen result does not exclude infection with L. pneumophila Serogroup 1. A positive test result can occur due to current or past infection and therefore is not definitive for infection without other supporting evidence.

Day(s) Performed


Method Description

Immunochromatographic assay for the qualitative detection of Legionella pneumophila Serogroup 1 Antigen