If you think there might be a chance that you could fail the medical screening in Doha consider having the tests done in the States before you leave. Failing the tests means you can be denied an RP. Your insurance with your current employer may pick up part of the bill and even if they don't it may be worth it to know where you stand before you give everything up to move here. My company paid for the tests for me and everyone in my family before we left the States. It is there standard practice with all employees moving to Doha. They said it was insurance just in case there was a mistake with testing here in Doha and it took about a week to get the results back for everything.