The initial test is found to be positive. The test to confirm the diagnosis is?

Western Blot

Western blot is the confirmatory test for determining whether a person has Lyme disease.

It provides more information than enzyme linked immunosorbent assay (ELISA) regarding the type of antigens that are reacting, and has a high specificity.

This test is utilized when the ELISA test is either positive (due to chance of false positive results) or if the test is equivocal.

*If the ELISA test is negative, then a person is considered negative and would not require further testing.