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Test Code SLEG Legionella pneumophila (Legionnaires Disease), Antibody, Serum

Reporting Name

Legionella Pneumophila Ab, S

Useful For

Evaluation of possible legionellosis (Legionnaires disease, Pontiac fever, extrapulmonary legionella infection caused by Legionella pneumophila)

Specimen Required

Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Specimen Volume: 0.5 mL

Specimen Type


Specimen Minimum Volume

0.4 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Refrigerated (preferred) 14 days
  Frozen  14 days

Day(s) and Time(s) Performed

Tuesday, Thursday; 2 p.m.

Seattle Children's Hospital Note:

TAT: 3 - 7 days

Performing Laboratory

Mayo Medical Laboratories in Rochester

Method Name

Enzyme-Linked Immunosorbent Assay (ELISA)

Method Description

The Legionella kit is designed to detect IgG-, IgA-, and IgM-class antibodies to Legionella pneumophila in human sera. The test procedure involves 3 incubation steps:

1. Test sera (properly diluted) are incubated in multiwells coated with an inactivated, solubilized cocktail of Legionella pneumophila groups 1-6 bacteria (antigen). Legionella specific IgG, IgM, or IgA antibodies in the specimen will bind to the immobilized antigen. The plate is washed to remove unbound antibody and other serum components.

2. Peroxidase-conjugated goat-antihuman IgG, IgA, and IgM is added to the wells and the plate is incubated. The conjugate will react with antibody immobilized on the solid phase in step 1. The wells are washed to remove unreacted conjugate.

3. The multiwells containing immobilized peroxidase conjugate are incubated with peroxidase substrate solution. Hydrolysis of the substrate by peroxidase produces a color change. After a period of time, the reaction is stopped and the color intensity of the solution is measured photometrically. The color intensity of the solution depends upon the antibody concentration in the test specimen.(Package insert: Legionella IgG, A, M ELISA II, Wampole Laboratories, Princeton, NJ 2005-016-16)

Reference Values


Reference values apply to all ages.

Test Classification

This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
SLEG Legionella Pneumophila Ab, S 7947-5


Result ID Test Result Name Result LOINC Value
SLEG Legionella Pneumophila Ab, S 7947-5

Reject Due To


Mild OK; Gross reject


Mild OK; Gross reject