Speckle Pattern in Clotting Blood (video) The Optical Society Loading video... Caption This video is taken from the same sample of blood featured in the Speckle Pattern in Unclotted Whole Blood video after 10 minutes. In this case, the time-varying fluctuations of the speckle pattern are markedly reduced due to the restricted motion of the blood cells that aggregate or are trapped within the clot. By quantifying the fluctuations of speckle patterns, researchers can measure changes in clot stiffness rapidly and with exquisite measurement sensitivity, using just a drop or two of whole blood. Credit Seemantini Nadkarni Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.