It depends on which medical certificate you are here for.
When you come to us, the doctor will check that you are in good physical and mental shape to carry out your work. This involves, among other things, a check of vision / color vision, hearing, a general health examination and a review of medication in use.
In some cases, further examination will be necessary. This may involve, for example, blood tests, ECG, chest x-ray or spirometry (lung function test).