Have another test on independent laboratory which has no particular interest with OFW medical requirements. I'm not sure whether Business VISA got the same requirements with sponsored Visit VISA. But I was also told to undergo with those medical certifications which I did not comply. Yet I was able to get boarded on the plane in Mactan International Airport.
The whole point is to have yourself checked by other Doctor. It's important to confirm about that lung scar before your flight. Everything will be going against you here if that will be found out. X-ray gets the same result here. To get work visa you are require to have 2 tests: blood sample for HIV & Hepatitis tests and lung X-ray. The Ministry of Health of Qatar has the final say whether you will be cleared.
Local Accredited medical laboratories requirements, in my opinion, is a burden rather than a help to OFWs. They would give you results that would make you spend more and delay you travel.
Better to ask also your employer regarding this matter.
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Believe!.