The invention relates to a screening apparatus (105) for screening a light path (107) between an optical unit (110) of a lab-on-a-chip-analyser (100) and a lab-on-a-chip cartridge (115) for a lab-on-a-chip analyser (100). The screening apparatus (105) comprises a hollow body (130) and a contact (135). The hollow body (130) has an optical opening (140) for connecting the hollow body (130) to the optical unit (110) and a cartridge opening (145) for connecting the hollow body (130) to the lab-on-a-chip cartridge (115). Additionally, the hollow body (130) is designed to shape the light path (107) between the optical opening (140) and the cartridge opening (145) and to screen it against ambient light. The contact element (135) is arranged on the hollow body (130) for establishing electrical contact with the lab-on-a-chip cartridge (115).
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