title: [The value of the guaiac test in the screening of colorectal tumors].
abstract: The sensitivity, specificity and positive predictive value of fecal blood testing are too poor to allow its general use as a screening test for colorectal cancers. Even the predictable qualitative improvement of these tests will be of no avail with regard to non-tumoral sources of bleeding or the non-hemorrhagic tumoral sources of bleeding or the non-hemorrhagic tumours which are frequent in the early stages of colorectal cancer. It is therefore essential to define high-risk groups, to pay particular attention even to minor symptoms, and to perform the necessary endoscopic or radiological diagnostic tests.
mesh_terms: D003110:Colonic Neoplasms / Q000175:diagnosis*; D003113:Colonoscopy; D003362:Cost-Benefit Analysis; D003951:Diagnostic Errors; D006801:Humans; D008403:Mass Screening / Q000191:economics; D009780:Occult Blood; D012004:Rectal Neoplasms / Q000175:diagnosis*; D012306:Risk
vernacular_title: Valeur du test au guaïac pour le dépistage des tumeurs colorectales.