Abstract: A system for testing a microfluidic sample chip to perform PCR and/or fluorescence type testing of the biological samples. The chip having the form of a hollow block including at least one chamber delimited by an upper wall and a lower wall. The chamber receiving a sample to be tested and the chamber being associated with thermalization element and with a sensor to measure the fluorescence. The system further includes a tab, preferably opaque and/or rigid or semirigid, positioned in the continuation of, and preferably in the same plane as, the walls.