A lancing device (121) substantially reduces wobble in a lancet (151) used to lance a site. The lancet (151) is removably received by a cartridge (161), which is movably received by the lancing device (121). The lancet (151) is movable between a first position in which a penetrating member (153) connected to the lancet (151) is unexposed and a second position in which the penetrating member is exposed outside of the lancing device (121) for lancing a site. A spring (171) is connected to the cartridge (161) to return the lancet (151) to the first position after the site is lanced.
