Ordering Recommendation

Diagnose infection from Ehrlichia chaffeensis.

Mnemonic
E CHAF ABS
Methodology

Semi-Quantitative Indirect Fluorescent Antibody

Performed

Tue, Fri

Reported

1-5 days

New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
Collect

Serum Separator Tube.

Specimen Preparation

Separate from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.3 mL) Parallel testing is preferred and convalescent specimens must be received within 30 days from receipt of the acute specimens. Mark specimens plainly as acute or convalescent.

Storage/Transport Temperature

Refrigerated.

Unacceptable Conditions

Contaminated, hemolyzed, or severely lipemic specimens.

Remarks
Stability

After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)

Reference Interval
Test Number
Components
Reference Interval
0051004 Ehrlichia chaffeensis Antibody, IgG by IFA < 1:64  Negative-No significant level of Ehrlichia chaffeensis IgG antibody detected.
1:64-1:128  Equivocal-Questionable presence of Ehrlichia chaffeensis IgG antibody detected.  Repeat testing in 10-14 days may be helpful.
≥1:256  Positive-Presence of IgG antibody to Ehrlichia chaffeensis detected, suggestive of current or past infection.
0051003 Ehrlichia chaffeensis Antibody, IgM by IFA < 1:16  Negative-No significant level of Ehrlichia chaffeensis IgM antibody detected.
≥ 1:16  Positive-Presence of IgM antibody to Ehrlichia chaffeensis detected, suggestive of current or recent infection.

Interpretive Data

Refer to individual components.

Compliance Statement B: For laboratory developed tests not using a RUO kit, and for FDA approved, cleared or 510(k) exempt assays with alterations. This test was developed and its performance characteristics determined by ARUP Laboratories. The U. S. Food and Drug Administration has not approved or cleared this test; however, FDA clearance or approval is not currently required for clinical use. The results are not intended to be used as the sole means for clinical diagnosis or patient management decisions.

Note

Human ehrlichiosis is a tick-borne disease caused by rickettsial-like agents. Two forms, human monocytic ehrlichiosis (HME) and human granulocytic ehrlichiosis (HGE), have been described. HME is often referred to as "spotless" or rashless Rocky Mountain spotted fever, and has been reported in various regions of the United States. The causative agent of HME has been identified as Ehrlichia chaffeensis. Infected individuals produce specific antibodies to Ehrlichia chaffeensis which can be detected by an immunofluorescent antibody (IFA) test.

Hotline History
N/A
CPT Codes

86666 x2

Components
Component Test Code* Component Chart Name LOINC
0051003 Ehrlichia chaffeensis Antibody, IgM 48850-2
0051004 Ehrlichia chaffeensis Antibody, IgG 47405-6
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • E. chaffeensis antibodies
  • E. Chaffeensis IgG, IgM Ab
  • Ehrlichiosis IFA test
Ehrlichia chaffeensis Antibodies, IgG & IgM by IFA