We wish to understand the mechanism to which polymer brushes such as PEO resist the adsorption of protein and thus offer biocompatibility for various surface applications. Preliminary experiments and recent theory suggest that the protein adsorption is a random sequential process proportional to polymer coverage. To prove this rational we must first locate the position and amount of protein adsorbed with increasing grafting density and molecular weight of the PEO chains (polymer coverage). Neutron reflectivity will allow us to relate the segment length density profile of the brush with the adsorbing protein molecule. With this information we hope to prove or dispel the current theories regarding protein adsorption at polymer brushes.