I understand from my parents that they were given a medical questioner( had TB, any major operation done,are you Diabetic, if yes then details, are you pregnant,how many months etc)they take your height, weight,then the doctor will ask some questions on your health condions, if you are using a lense eye test,physical examination of the upper body, chest x ray, Blood test(HIV etc) including HbA1c for Diabetic person, urine test.These results are sent to another place(Singapore/Philipine) for assesment (they charge for the courier service and that is how I came to know this from my parents)and may be they send their conclusion to the concerned embassy.
hope those are waiting for medical get an idea of what awaits them.
Regards
Maliiyer