Thank you very much for your answer. In fact, in various web sites, it is mentioned from lung x-ray and not blood tests, including medical interview. However, it is mentioned from vaccination card for university students, e.g. ERASMUS.
I am waiting medical visit invitation now. I hope things go well.
I don't think that it should be a problem. Never heard of special screening for French residency. I am besides other also a French citizen, but haven't lived in France since 1968. So I am not up to date with these kind of things. Did they ask for a hep B status on the application?