Blood withdrawal system for withdrawing blood for diagnostic purposes, comprising a housing with an outlet opening for the tip of a lancet, a lancet guide and a lancet drive. The cockpit wall and the closed door allow for a free air exchange between passenger cabin and the cockpit. Further, the file loss caused by a hard disk failure is minimized by providing redundancy on an individual file basis and not on an individual hard disk basis. On the other hand, when the bar code is printed, the priner driver compatible with a given printer converts the display font into a bar code record font and supplies the bar code record font. The capillary test space is sized to wick the fluid from the reservoir when the fluid contacts the capillary test space. A metal layer is deposited on the resist layer and into the openings, and the resist layer is removed to form a gap between the metal layer and the underlying substrate assembly.