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Test ID FECHA Ehrlichia chaffeensis Antibodies (IgG, IgM)

Method Name

Immunofluorescence Assay (IFA)

Reporting Name

E. chaffeensis Ab (IgG, IgM)

Specimen Type


Specimen Required

Draw blood in a plain, red-top tube(s), serum gel tube(s) is acceptable. Spin down and send 1 mL of serum refrigerated in a plastic vial.

Specimen Minimum Volume

0.2 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Refrigerated (preferred) 14 days
  Frozen  30 days
  Ambient  7 days

Reference Values

IgG   <1:64

IgM   <1:20


Ehrlichia chaffeensis has been identified as the causative agent of Human Monocytic Ehrlichiosis (HME). Infected individuals produce specific antibodies to E. chaffeensis that can be detected by an immunofluorescent antibody (IFA) test. Single IgG IFA titers of 1:64 or greater indicate exposure to E. chaffeensis. A four-fold rise in IgG titers between acute and convalescent samples and/or the presence of IgM antibody against E. chaffeensis suggest recent or current infection.

Day(s) and Time(s) Performed

Monday through Sunday

Performing Laboratory

Focus Diagnostics, Inc.

Test Classification

This test was developed and its performance characteristics have been determined by Focus Diagnostics. It has not been cleared or approved by the U.S. Food and Drug Administration. The FDA has determined that such clearance or approval is not necessary. Performance characteristics refer to the analytical performance of the test.

CPT Code Information

86666 x 2

LOINC Code Information

Test ID Test Order Name Order LOINC Value
FECHA E. chaffeensis Ab (IgG, IgM) In Process


Result ID Test Result Name Result LOINC Value
Z0545 E. chaffeensis Ab IgG 9783-2
Z0546 E. chaffeensis Ab IgM 9784-0
Z0547 Interpretation In Process