These and other objects of the present invention are achieved in a body
fluid sampling system for use on a tissue site that includes a drive
force generator and a penetrating member operatively coupled to the force
generator. The force generator moves the member along a path out of a
housing with a penetrating member exit, into the tissue site, stops in
the tissue site, and withdraws out of the tissue site. The drive force
generator is configured to be controlled to follow a predetermined
velocity trajectory into the tissue and out of the tissue. A tissue
stabilizing member is associated with the device and at least partially
surrounds an impact location of the penetrating member on the tissue
site. A user interface is configured to relay at least one of,
penetrating member performance or a penetrating member setting.