The adaptation of medical diagnostic applications into micrototal analytical systems (μTAS) has the potential to improve the ease, accessibility and rapidity of medical diagnostics. This work adapts direct current dielectrophoresis (DC-DEP) to a medical diagnostic application of sorting blood cells where an insulating obstacle is used to produce a non-uniform electric field. Initial efforts are focused on achieving separation of positive ABO red blood cells. Two dependencies will simultaneously be explored: blood type and blood cell size. Fluorescent polystyrene particles of three different sizes will be tested and compared against the separation and collection of actual blood cells into different sample bins. Further, continuous separation of red blood cells according to blood types and collection into specific bins will be explored. This developed technique is directly applicable for use in a portable device for easy and rapid blood diagnostics.