An adjustable endcap for a lancing device includes a basecap and a twistcap. The basecap includes a post with detents thereon. At least one finger is provided on the basecap adjacent the post. The twistcap includes at least one helical track on its outer surface into which the finger extends when the twistcap is mounted on the post. The twistcap also includes a plurality of grooves on an inner surface for engagement with the detents. As the twistcap is rotated on the post, the interaction of the finger and track causes the twistcap to move toward and away from the basecap and to adjust the penetration depth of a lance reciprocally mounted in the lancing device.