The present invention relates to an analyser for fluid sample analysis. It is described to receive (410) a fluid sample in a chamber. The fluid sample is moved (420) in the chamber over at least a predetermined distance. Physical changes are detected (430) in the chamber. A time for the fluid sample to move over the predetermined distance in the chamber is measured (440). At least one property of the fluid sample is determined (460) on the basis of the time for the fluid sample to move over the predetermined distance in the chamber.