Medical system and method of sterility testing the medical system

The invention discloses a medical system (144). The medical system (144) comprises: i) a housing (146); ii) a preassembled functional module (110) received in the housing (146), the preassembled functional module (110) comprising a. an analyte sensor (112) for detecting at least one analyte in a body fluid of a user; b. an electronics unit (120) electrically connected to the analyte sensor (112); and c. an insertion component (114) for inserting the analyte sensor (112) into a body tissue of the user; and iii) at least one removable protective cap (148) connected to the housing (146), covering the preassembled functional module (110), wherein the preassembled functional module (110) further comprises at least one sterility cap (116), which at least partially surrounds the insertion component (114), wherein the at least one sterility cap (116) is at least partially surrounded by the protective cap (148), wherein the sterility cap (116) comprises at least one sterility testing access (140), the sterility testing access (140) comprising at least one of a septum (142) and a multiple-step sealing (162). Further, methods of providing the medical system (144) and of sterility testing of the medical system (144) are disclosed.