The invention discloses a medical system (110).The medical system (110)comprises: a.a housing (112)； b.a preassembled functional module (118) received in the housing (112), the pre- assembled functional module (118) comprising b1.an analytical sensor (120) for detecting at least one analyte in a body fluid of a user； b2.an electronics unit (126) electrically connected to the analytical sensor (120)； and b3.an insertion component (130) for inserting the analytical sensor (120) into a body tissue of the user； c.at least one removable protective cap (134) connected to the housing (112), covering the preassembled functional module (118).
