Final answer:
The most appropriate diagnostic test for the patient in the previous question would be a Western blot test, also known as an immunoblot test. This test is performed to confirm the presence of antibodies against the bacteria that cause Lyme disease.
Step-by-step explanation:
If the first test for Lyme disease antibodies came back inconclusive, the most appropriate diagnostic test for the patient in the previous question would be a Western blot test, also known as an immunoblot test. This test is performed to confirm the presence of antibodies against the bacteria that cause Lyme disease. The Western blot test can provide more information and help to distinguish between Lyme disease and other diseases.