![]() It may also be an indication that someone had a previous infection that has been removed from the body. This is usually interpreted as having a late-stage Lyme disease infection. Negative IgM, Positive IgG, Positive Western Blot. This usually indicates that the Lyme disease infection is in its early stages or that the blood test has produced a false positive result. Positive IgM, Negative IgG, Negative Western Blot. These other result combinations are usually interpreted in the following ways. When all three tests are positive, then Lyme disease is likely. What Do the Test Results Mean?īecause there are three tests that are typically conducted for the Lyme disease blood test, then results can vary based on the combination of test results received. This is especially true if antibody levels continue to rise over time. If these tests are positive and followed up by a positive Western Blot test, then the chances are very good that Lyme disease is present. This is because people who have never been exposed to the bacteria that causes the disease will not have any antibodies present. The IgM and IgG tests are generally ordered first when Lyme disease is suspected.
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