Method and a device for characterizing the coagulation or sedimentation dynamics of a fluid such as blood or blood plasma

A device for characterizing the coagulation or sedimentation dynamics of a fluid such as whole blood, a blood fraction, or blood plasma, the device comprising:

• a microfluidic device having a fluid flow passage suitable for receiving a sample of said fluid and enabling it to be illuminated;
• lighting means for illuminating said sample by a spatially coherent light beam;
• an image sensor for acquiring a time series of images of an optical speckle pattern generated by interaction between said sample and said coherent light beam;
• and
• processor means for processing said time series of images;
• wherein said processor means are adapted to calculate a function representative of the variation of said speckle pattern between two or more images of the series.