An apparatus for eliciting a blood sample comprises a housing, an aperture in a wall of the housing, an aperture cover moveable between a first position in which the aperture is covered and a second position in which the aperture is uncovered, the aperture cover comprising a sealing member configured to seal the aperture on a first side of the wall when the aperture cover is in the first position and a user-contactable part extending from the sealing member through the aperture to the second side of the wall and configured to allow a user to move the aperture cover between the first and second positions.一種用於抽取血液樣本之裝置,其係包含:一殼體,在該殼體之一壁中的一孔口,一孔口蓋,其係可在蓋住該孔口的第一位置與未蓋住該孔口的第二位置之間移動,該孔口蓋包含經組態成在該孔口蓋處於該第一位置時可在該壁之第一側上密封該孔口的一密封構件以及由該密封構件伸出通過該孔口至該壁之第二側以及經組態成允許使用者移動該孔口蓋於該第一及該第二位置之間的一使用者可接觸部。