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Listeria Antibody

Test Codes

ARUP #99529, EPIC: LAB6297, SOFT: XLIST

Department

Send Outs

Specimen Collection Criteria

Collect (preferred specimen): One plain Red-top tube.
Also acceptable: One Gold-top SST tube.

Physician Office/Draw Specimen Preparation

Let specimen clot 30-60 minutes then centrifuge to separate serum from cells. Transfer serum to a plastic transport tube and refrigerate (2-8°C or 36-46°F).

Preparation for Courier Transport

Transport: 1.0 mL serum refrigerated (2-8°C or 36-46°F). (Minimum: 0.5 mL)

Rejection Criteria

Specimens not collected and processed as indicated.

In-Lab Processing

Let specimen clot 30-60 minutes then centrifuge to separate serum from cells. Transfer serum to a plastic transport tube and refrigerate (2-8°C or 36-46°F).

Transport: 1.0 mL serum refrigerated (2-8°C or 36-46°F). (Minimum: 0.5 mL)

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 7 days
Refrigerated (2-8°C or 36-46°F): 14 days
Frozen (-20°C/-4°F or below): 1 month

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.

Laboratory

Sent to ARUP Laboratories, Salt Lake City, UT, forwarded to Quest Diagnostics Infectious Disease, Cypress, CA.

Performed

Varies.
Results available in 4-9 days.

Reference Range

By report.

Test Methodology

Semi-Quantitative Complement Fixation.

Interpretation

Single titers of greater than or equal to 1:8 are suggestive of Listeria infection. A four-fold or greater increase in titer between acute and convalescent specimens confirms the diagnosis.

Clinical Utility

A serological diagnosis of Listeria infection can be made on the basis of rise in specific antibody between acute and convalescent sera. Serology is also useful in epidemiological studies of Listeria outbreaks whereas single convalescent sera with titers equal to or greater than 1:8 suggest listeria infection.

CPT Codes

86609
LOINC:  49711-5

Contacts

Last Updated

7/7/2021