The invention relates to a measuring device, to the production thereof, and to the use thereof for magnetic flow cytometry, wherein a microfluidic channel is disposed along an enrichment route such that a magnetically marked cell sample flowing through the microfluidic channel is aligned to magnetic guide strips, enriched by the magnetic field of a magnet at the floor of the channel, and guided past a sensor. The enrichment route is thereby implemented with the microfluidic channel on the packaging of the semiconductor chip carrying the sensor. Said construction ensures a long enrichment route for high throughput of large sample volumes.