Shriners Burns Hospital 1 article published in JoVE Bioengineering Microfluidic Platform for Measuring Neutrophil Chemotaxis from Unprocessed Whole Blood Caroline N. Jones*1,2,3, Anh N. Hoang*1,2,3, Laurie Dimisko1, Bashar Hamza1, Joseph Martel1,4, Daniel Irimia1,2,3 1The BioMEMS Resource Center, Department of Surgery, Massachusetts General Hospital, 2Harvard Medical School, 3Shriners Burns Hospital, 4Harvard University School of Engineering and Applied Sciences This protocol details an assay designed to measure human neutrophil chemotaxis from one droplet of whole blood with robust reproducibility. This approach circumvents the need for neutrophil separation and requires only a few minutes of assay preparation time. The microfluidic chip enables the repeated measure of neutrophil chemotaxis over time in infants or small mammals, where sample volume is limited.