A microfluidic test device has a body, a first chamber having an outlet provided with a first valve and holding a first buffer having a first buffer volume, a primary reaction chamber, a sample inlet for receiving and feeding a sample having a sample volume, into the microfluidic test device, a first fluid path connecting the outlet of the first chamber and the sample inlet, a second fluid path connecting the sample inlet and the primary reaction chamber, a primary test part having a primary test chamber, a third primary fluid path connecting the primary reaction chamber and the primary test part, a primary valve arranged in the third primary fluid path, a flow driving device configured to move fluid from the primary reaction chamber to the primary test part, and a heating assembly configured to heat a reaction fluid in the primary reaction chamber.