Apparatus for eliciting a blood sample comprises: a member rotatably mounted on a shaft and configured to rotate between a first position and a second position; and a curved lancet protruding from the member and configured to co-rotate with the member such as to provide skin penetration by the lancet when the member is in the second position. At least 1 mm of the end portion of the curved lancet is coincident with a line that is concentric with respect to the shaft.