Hello Doc
You can visit the website www.prometric.com
Then scroll down to SCH-Supreme Council of Health,Qatar and follow the rest.
You need to take the Prometric Exam for obtaining a License to practice in Qatar.
You can take the exam ,online ,in a Prometric Center in your country.Once you pass the exam,you will get a printout of the result.With this ,you can apply for jobs in Qatar.
Hope this helps.
Regards