Can a blood test reveal bowel cancer?

Yes/No: Blood tests may show a problem; however blood tests cannot diagnose bowel (eg colon) cancer. Low hemoglobin (anemia) may indicate bowel blood loss, but is not specific. Additionally, colon ca has a tumor marker CEA that is useful after a diagnosis is made, but cannot diagnose by itself.

Not : At this point in time although there is a grat deal of research in this direction. Someday, this may be a reality.