DIAGNOSTIC DEVICE

The present invention refers to a microfluidic device (1) comprising a first fluid source, in particular comprising a preparation chamber (5); at least one covered channel (31); and fluid control means, in particular comprising a fluid control valve (57), configured to transfer a specific volume of fluid from the first fluid source to the or each covered channel (31). It also refers to a diagnostic device (101) for determining the presence of a target analyte in a fluid sample, wherein the first fluid source is provided in the form of a preparation chamber (5, 105); the at least one covered channel (31, 131) is provided in the form of a microchannel, wherein the or each microchannel comprises a fluid inlet (37, 137) and a fluid outlet (39) and a capture surface for selective capturing the target analyte, preferably provided by a channel ceiling (35); and the fluid control means is configured to transfer of a specific volume of fluid from the first fluid source to the or each microchannel