Of course it is not so easy as it is existing.  First thing u have to register urself in Hamad Hospital for the the health card which cost u QR 100.  After that they will provide the detail of the helath center (Pobably based on the location as well the capacity of the health center) that u can go for your checkup.  However anything beyond that you would be asked to go to Hamad.  (Emergecny always in Hamad)

Please go and find the registration procedure in Hamad and then check with the people available there.