Medical Test
From my understanding the medical test is conducted upon your arrival in Dubai. It is a standard aviation medical test that includes a full blood and urine screen, hearing and vision tests and a reflex test. If you pass all tests you should be fine. On the instance you do not clear this medical your contract with Emirates will be terminated. You must be clear of teburculosis and HIV for visa requiremets and also you must pass a drug test. If you are taking any medication its best to take a copy of your prescription and a note from your doctor advising why that medication has been subscribed. Alot of common medications for the western world are illegal in the middle east. So it is best to declear if you are taking medication. This is based on my experience purely so I hope this is of some use.