Abstract: The invention relates to an apparatus for extracorporeal blood treatment having a dialyzer which is divided into a first and a second chamber 29, 30 by means of a semipermeable membrane wherein the first chamber 29 is arranged in a dialysate path and the second chamber 30 can be connected to a patient's blood circulation by means of a blood supply line 32 and a blood discharge line 31, an inlet 20 for fresh dialysate, an outlet 36 for spent dialysate, a measuring device 37, wherein the measuring device 37 has at least one radiation source 1 for substantially monochromatic electromagnetic radiation. Thereby the measuring device 37 for determination of a luminescence of the spent dialysate flowing through the outlet 36 has at least one detector system (5) for detecting the intensity of the electromagnetic radiation generated by luminescence.

Abstract: Detection device for quantitative detection of predetermined molecules, in particular medium size protein molecules, in a sample liquid with a light source for emitting measurement radiation, a section for irradiating the sample liquid and a light detector for measuring the detection radiation exiting the section for irradiating the sample liquid, as well as an analysis stage located downstream of the light detector for analyzing the detector signal, wherein the light source is designed such that the measurement radiation has a spectral range exciting the intrinsic fluorescence of a molecule to be determined, and the light detector is designed such that at least one spectral range of the detection radiation is measured, in which the molecule emits intrinsic fluorescence radiation.