System for the liquid sample analysis comprising a position control unit

System for analyzing sample liquids by evaluating test elements with an analytical unit (20), wherein an analyte test element (10) is positioned in an analysis position relative to the analyzing unit by a holder (140 21, 22, 120) and the system further comprises a position control unit to check whether an analytical area of ​​the test element is intended positioned to the analysis unit, includes, wherein the position control unit, a light source (30, 2) for irradiating an area of ​​the test element, preferably the analytical area (11), a detector (31, 131) for the detection of the surface reflected light, and an evaluation unit includes, and the light source and detector are positioned to each other, that the light intensity of specularly reflected radiation at the detector when properly positioning the test element is different from a light intensity at mispositioning and the evaluation result of the light intensity at the detector a possible mispositioning recognizes. DOLLAR A Furthermore, the invention includes a method for sample analysis using a position control unit for controlling whether a test item is intended positioned relative to an evaluation optics.