Lyme Disease Testing

I saw Dr. Yager (GP) last Thursday, and picked up a prescription for a Lyme disease test. Here is how that brief encounter went:

Dr: what test do you need done?
Me: the cardiologist thinks I should be tested for Lyme disease.
Dr: that's a good idea, it could be Lyme disease.
(awkward pause)
Dr: did they find something on your EKG?
Me: I think some stuff with my right ventricle.
Dr: well, carcinoid can affect the heart ... but something always shows up on an EKG.
(handing me the script)
Dr: this isn't a very good test.
Me: what do you mean?
Dr: it can come back positive when you don't have Lyme disease, and come back negative when you do.
(second awkward pause)
Me: ok
Dr: it's not a very good test; we'll call you with the results.
Me: uh, ok. Thanks

15 minutes later, I was at LabCorp, getting yet another vile of blood drawn for a test that is apparently meaningless; I have absolutely no idea what to do when I get the results.

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Update 5/28: Lyme Test Came Back Negative. (Despite Dr. Yager's distrust of the results, I'm crossing Lyme off the list.)