Fluidic Unit for Discrete Element Trapping

Fluidic unit (2), preferably microfluidic, for trapping a discrete element (10) in a liquid sample (100a) and comprising:• a well (3) for receiving a volume of a liquid (100) comprising the discrete element (10);• a well output conduit (4);• a metering chamber (5) in fluid communication with the well (3) through said well output conduit (4), for metering a liquid sample (100a) of the volume of the liquid (100) received from the well (3);• a waste output conduit (6) for evacuating an excess portion (100b) of the volume of the liquid (100) from the metering chamber (5);• waste output conduit obstruction means (6a) able to be in closed and opened configurations for preventing or allowing the liquid to pass through the waste output conduit (6), respectively.