Abstract: A test element, analytical system and method for optical analysis of fluid samples is provided. The test element has a substrate and a microfluidic channel structure, which is enclosed by the substrate and a cover layer. The channel structure has a measuring chamber with an inlet opening. The test element has a first level, which faces the cover layer, and a second level, which interconnects with the first level such that the first level is positioned between the cover layer and the second level. A part of the measuring chamber extending through the first level forms a measuring zone connecting with a part of the measuring chamber that extends partially into the second level, forming a mixing zone. Optical analysis of fluid samples is carried out by light guided through the first level parallel to the cover layer, such that the light traverses the measuring zone along an optical axis.

Abstract: The present invention is generally directed towards a system for reagent-free determination of the concentration of an analyte in vivo. The system comprises a light transmitter for generating monochromatic primary light, a scattered-light percutaneous sensor which includes an inbound light guide and a detection light guide, a wavelength-selective detection device that is connected to the detection light guide for detection of Raman-scattered components of the secondary light and an evaluation device for determining the concentration of the analyte from the Raman-scattered components of the secondary light.

Abstract: The present invention is generally directed towards a system for reagent-free determination of the concentration of an analyte in vivo. The system comprises a light transmitter for generating monochromatic primary light, a scattered-light percutaneous sensor which includes an inbound light guide and a detection light guide, a wavelength-selective detection device that is connected to the detection light guide for detection of Raman-scattered components of the secondary light and an evaluation device for determining the concentration of the analyte from the Raman-scattered components of the secondary light.