AFP and neoplasm: CVs - coefficient of variations reported by participating laboratories. TM - tumour marker. TEa - total allowable error. N – number of participating laboratories. 5th, 25th, 75th, 95th – percentiles. AFP - alpha-fetoprotein. CEA - carcinoembryonic antigen. PSA - total prostate specific antigen. CA125 - cancer antigen 125. CA15-3 - cancer antigen 15-3. CA19-9 – cancer antigen 19-9.