False +ve Hep B result - Upcoming medical test - residency visa?

Residency Visa - Medical Test upcoming.

Firstly, I have noticed that the UAE official website says Hep B will be tested only for certain categories and I don't fall into that. However, I have heard stories online were people said that we are tested for Hepatitis B and the medical centre will forward it to Immigration who will then decide whether to deport or ban. Now I am not sure how true these stories are.

I am currently in AbuDhabi and in my case, from a recent experience from my home country, I will test low value positive (4 s/c)

for Hbsag if a specific brand machine is used which uses something called a CMIA method. On other equipments that use ELISA or ECLIA method, I will be tested negative. My confirmatory HBV DNA PCR test came out undetected (negative) which means false positive in the CMIA method.

1) Is there anyway to know beforehand and go to a medical centre that doesn't use this brand Machine?

2) Or is it 100 % confirmed that Hep B test won't be currently done for me in Abu Dhabi (Assistant Accountant).

3) Even if tested positive, will they give me option to prove using HBV DNA PCR test?