title: When is a tumor marker a laboratory test?
mesh_terms: D002272:Carcinoembryonic Antigen / Q000032:analysis*; D006528:Carcinoma, Hepatocellular / Q000175:diagnosis* / Q000276:immunology; D003110:Colonic Neoplasms / Q000175:diagnosis* / Q000276:immunology; D005069:Evaluation Studies as Topic; D005188:False Negative Reactions; D005189:False Positive Reactions; D006801:Humans; D008113:Liver Neoplasms / Q000175:diagnosis* / Q000276:immunology; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D002272:Carcinoembryonic Antigen; D000509:alpha-Fetoproteins