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Lyme disease blood test

Definition

The Lyme disease blood test looks for antibodies in the blood to the bacteria that causes Lyme disease. The test is used to help diagnose Lyme disease.

Alternative Names

Lyme disease serology; ELISA for Lyme disease; Western blot for Lyme disease

How the Test is Performed

A blood sample is needed.

A laboratory specialist looks for Lyme disease antibodies in the blood sample using the ELISA test. If the ELISA test is positive, it must be confirmed with another test called the Western blot test.

How to Prepare for the Test

You do not need special steps to prepare for this test.

How the Test will Feel

When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or a slight bruise. This soon goes away.

Why the Test is Performed

The test is done to help confirm the diagnosis of Lyme disease.

Normal Results

A negative test result is normal. This means none or few antibodies to Lyme disease were seen in your blood sample. If the ELISA test is negative, usually no other testing is needed.

Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your health care provider about the meaning of your specific test results.

What Abnormal Results Mean

A positive ELISA result is abnormal. This means antibodies were seen in your blood sample. But, this does not confirm a diagnosis of Lyme disease. A positive ELISA result must be followed up with a Western blot test. Only a positive Western blot test can confirm the diagnosis of Lyme disease.

For many people, the ELISA test remains positive, even after they have been treated for Lyme disease and no longer have symptoms.

A positive ELISA test may also occur with certain diseases, such as rheumatoid arthritis.

Risks

Veins and arteries vary in size, so it may be harder to take a blood sample from one person than another.

Other slight risks from having blood drawn may include:

  • Excessive bleeding
  • Fainting or feeling lightheaded
  • Hematoma (blood accumulating under the skin)
  • Infection (a slight risk any time the skin is broken)

References

Chernecky CC, Berger BJ. Lyme disease antibody - blood. In: Chernecky CC, Berger BJ, eds. Laboratory Tests and Diagnostic Procedures. 6th ed. Philadelphia, PA: Elsevier Saunders; 2013:745-747.

Steere AC. Lyme disease (lyme Borreliosis) due to Borrelia burgdorferi. In: Bennett JE, Dolin R, Blaser MJ, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. 8th ed. Philadelphia, PA: Elsevier Saunders; 2015:chap 243.

Review Date:12/10/2015
Reviewed By: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, Boston, MA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

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