What Type of COVID Test Certification

[AAArdvark]

I will be travelling to the Philippines.  They need a COVID test result of either an Antigen test within 24 hours of travel or a RT-PCR test within 48 hours.  It seems that the testing centers in Bangkok either give a Medical Certificate or a Fit To Fly certificate with different prices.  Does anyone know which of these or both actually have a signed statement that indicates that there was no COVID present at the time of the test.  I don't want to get rejected at the airport because a piece of paper says something simple like "This person is fit to fly"

Can someone enlighten me please?

[ubonjoe]

There are clinics that will do the certified test result.

You can get a antigen test at Suvarnabhumi 24 hours a day while you wait.

Location is here: https://goo.gl/maps/1jJZ4UR4fJpgq5e18