Sampling system for collecting a liquid sample, in particular a bodily fluid, having an analytic auxiliary means, wherein the sampling system has a coupling element for coupling onto the analytic auxiliary means and a drive unit for driving a movement of the coupling element from a rest position into a deflected position, wherein the drive unit comprises a single energy transducer which is designed to generate a rotational movement with different rotational directions, wherein the drive unit furthermore has a coupling device with a rotational-direction sensitive element (194, 218; 242) for coupling onto the energy transducer and for supplying mechanical energy provided by the energy transducer to different system functions, wherein the coupling device is designed to couple the energy transducer onto a first system function in a first rotational direction, and to couple said transducer onto a second system function which differs from the first system function in a second rotational direction which differs from the first rotational direction, wherein the coupling device comprises a first drive wheel (184, 212) and a second drive element (186, 216), with the first drive wheel (184, 212) being coupled to the energy transducer, with the second drive element (186, 216) being coupled to the first system function and/or the second system function, with the first drive wheel (184, 212) and the second drive element (186, 216) being interconnected by the rotational-direction sensitive element (194, 218; 242), the rotational-direction sensitive element (194, 218; 242) coupling the first drive wheel (184, 212) and the second drive element (186, 216) to one another in the first rotational direction and decoupling the first drive wheel (184, 212) and the second drive element (186, 216) from one another in the second rotational direction, wherein the first system function and/or the second system function comprise at least one of the following functions of the sampling system: a drive for a puncture movement of a lancet of the analytic auxiliary means, a sampling movement of a test element of the analytic auxiliary means, a tensioning of an energy storage for driving the puncture movement of a lancet, a transport function of an analytic auxiliary means for providing the analytic auxiliary means in an application position, a transport function of an analytic auxiliary means for providing the analytic auxiliary means in a measurement position, a transport function of a cartridge of the sampling system for providing an analytic auxiliary means from a cartridge in an application position, a transport function of an analysis tape comprising a number of analytic auxiliary means for providing an analytic auxiliary means in an application position, a transport function of an analysis disk comprising a number of analytic auxiliary means for providing an analytic auxiliary means in an application position, characterized in that the sampling system is designed to perform the following sampling sequence: a) the energy transducer performs a first rotational movement in the first rotational direction, wherein a mechanical energy storage is released and emits energy for a puncture movement of a lancet of the analytic auxiliary means, which lancet is arranged in an application position; b) the energy transducer performs a second rotational movement in the second rotational direction, wherein a test element with a test field is transferred into the application position for analyzing the liquid sample; c) the energy transducer performs a third rotational movement in the first rotational direction, wherein the mechanical energy storage is charged with energy and wherein the test element is transferred into a deflected position for applying a liquid sample to the test field of the test element; d) the energy transducer performs a fourth rotational movement in the second rotational direction, wherein a lancet is transferred into the application position. a) the energy transducer performs a first rotational movement in the first rotational direction, wherein a mechanical energy storage is released and emits energy for a puncture movement of a lancet of the analytic auxiliary means, which lancet is arranged in an application position; b) the energy transducer performs a second rotational movement in the second rotational direction, wherein a test element with a test field is transferred into the application position for analyzing the liquid sample; c) the energy transducer performs a third rotational movement in the first rotational direction, wherein the mechanical energy storage is charged with energy and wherein the test element is transferred into a deflected position for applying a liquid sample to the test field of the test element; d) the energy transducer performs a fourth rotational movement in the second rotational direction, wherein a lancet is transferred into the application position.