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Serologic test for B. anthracis - Results

Alternative Names

Anthrax serology test; Antibody test for anthrax

Normal Values:

A normal result shows no antibodies present. During the first few days to weeks of exposure to an antigen, however, there may be slight antibody production. As the disease progresses, more antibodies will be present. If a disease is suspected, the test may need to be repeated 10 days - 2 weeks after the first test.

What abnormal results mean:

An abnormal result means antibodies to B. anthracis have been detected and you may have anthrax. However, some people are exposed to the bacteria and do not develop the disease. It is important to see an increase in the antibody count after a few weeks in order to diagnose a current (rather than a previous) infection.

Blood test

Reviewed last on: 8/28/2009
Linda Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine; Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

References

Daly JA. Bioterrorism: Microbiology. In: McPherson RA, Pincus MR. Henry's Clinical Diagnosis and Management by Laboratory Methods. 21st ed. Philadelphia, Pa: Saunders Elsevier; 2006: chap 64.

Lucey D. Anthrax. In: Mandell GL, Bennett JE, Dolin R, eds. Principles and Practice of Infectious Diseases. 6th ed. Philadelphia, Pa: Churchill Livingstone Elsevier; 2005: chap 324.

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