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Test Code LEGG Legionella pneumophila Antibody (Types 1-6), IgG by IFA, Serum

Clinical Indications

Provide retrospective evidence of suspected Legionella pneumophila infection.

Additional Test Codes

Epic Order Name: LEGIONELLA AB IGG (aka LEGG)
Sunquest Order Code: LEGG
Epic Px Code: LAB2355

Specimen Collection Type

Preferred: Gold
Acceptable: Red

Minimum Collection Volume

0.1 mL

Reference Range

< 1:128 Negative – No significant level of Legionella pneumophila Type 1-6 IgG antibody detected.
1:128 Equivocal – Questionable presence of Legionella pneumophila Type 1-6 IgG antibody detected. Repeat testing in 10-14 days may be helpful.
1:256 or greater Positive – Presence of Legionella pneumophila Type 1-6 IgG detected, suggestive of current or past infection.

Critical Value

N/A

Interpretation

Seroconversion between acute and convalescent sera is considered strong evidence of recent infection.  The best evidence for infection is a significant change on two appropriately timed specimens where both tests are done in the same laboratory at the same time.  This assay may detect infection by any of the serotypes 1-6.  The CDC and many state health laboratories recommend testing only for antibody to Legionella pneumophila Type 1.  For equivocal or positive IFA results, the CDC protocol suggests follow-up testing for Legionella pneumophila antibody Type 1.

Rejection Criteria

Contaminated, hemolyzed, or severely lipemic specimens.

Specimen Availability for Add-on Testing

2 Days

Specimen Stability

Refrigerated (preferred): 2 weeks
Ambient: 48 hours
Frozen: 1 year

Day(s) Performed

Mon-Fri

Performing Lab- Department

TUKHS-BH-Mail Outs

CPT Code

86713

LOINC Code

9541-4

Test Alias

Legionella pneumophila
Legionnaires Disease Testing

Additional Information / Notes

N/A