Question about some lab results

[TLO]

People with knowledge of lab work.. I need your help. I followed up with the nurse, and was told I need to repeat the same test, and if it comes back negative, I will either

A. Be discharged as a patient
B. Be taken off the medication.

I drove out to their office and spoke with them in person and got the same nurse I talked to on the phone. I told her I would take any test they wanted to give me, but that I've been through this before, and that repeating the same test would very likely result in a false negative. I asked to speak to my psychiatrist. Not in office. Asked to speak to the clinic manager. Not in office. She's going to relay my concerns to the doc and the head of the lab department tomorrow though.

Is there ac specific test I should request to have done? I did verify through Quest that the test that finally gave me the right results last year is no longer offered in this area, though it's offered in other parts of the country.