So as you've said I should tell my partner to visit a normal doctor and get the test done their and be treated if he's infected and then should he go to the panel doctor to do the final tests?
Also Can the specialists report be from any specialists or does he have to be registered under INZ?
The first part - yes. He must go to his normal doctor, be tested, and treated if necessary. No, he doesn't go back to the panel doctor. He must go to a recognized respiratory pulmonologist, a specialist or consultant - his own doctor will refer him to someone at this level, and will know who best to recommend in your area/country. His own doctor, if suspecting that there is active infection, may well have sent him to this person for the diagnosis and treatment anyway. But it is an assessment (a written report with diagnosis and prognosis) from the specialist, as well as the test results mentioned, which the MA will have to see.