Abstract: A modular lab-on-a-chip device for the analysis of a fluid including at least a base module, an end module and one or more analysis modules is described. Each module includes a respective first conduit and a respective second conduit. The first conduits define at least partially a first portion and the second conduits define at least partially a second portion of a fluidic channel. The end module includes a connecting conduit connecting the first portion and the second portion of the fluidic conduit to each other; and each analysis module includes a respective analysis conduit in fluidic connection with the respective first conduit and a sensor unit configured to determine at least one characteristic of the fluid and/or components present in the fluid when the fluid is present, in use, in the analysis conduit.