Abstract: The invention relates to a method of aiding the diagnosis of acute brain damage in a subject, said method comprising (i) assaying the concentration of at least one oxidative stress polypeptide selected from the group consisting of: PRDX1, PRDX6 and GSTP1 in a sample from said subject; and (ii) assaying the concentration of at least one further polypeptide selected from Panel A; (Hi) comparing the concentrations of (i) and (ii) to the concentrations of the polypeptides in a reference standard and determining quantitative ratios for said polypeptides; (iv) wherein a finding of a quantitative ratio of each of the assayed polypeptides in the sample to the polypeptides in the reference standard of greater than 1.3 indicates an increased likelihood of acute brain damage having occurred in said subject.