The ministry of health in Qatar seems pretty clear on both transit passenger and the accreditation of labs.
"All passengers traveling through the State of Qatar (Transit) must present a (PCR) test certificate before travelling, valid for 72 hours from arrival, and if another PCR test is needed for their next destination, the test can be conducted at Hamad International Airport for a fixed charge of Qrs. 300 per test. "
"Conduct a PCR test proving that they are free of Covid-19 up to 72 hours before reaching Qatar, from a medical center accredited by the local Ministry of Health in the country of departure."
The lab is accredited in the local country of departure - not Qatar
https://covid19.moph.gov.qa/EN/trave...s/default.aspx