A 26-year-old male asked:
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wouldnt a blood test or cat scan show stomach or colon cancer.?

2 doctor answers
Dr. Robert Killian
27 years experience General Practice
Scanning for Cancer: Good morning: not necessarily. Blood tests for cancer are not very specific and not too reliable. A ct scan can pick up anatomical abnormalities but if the tumor is not large it may not be easily identifiable. I would ask for more information on what stimulates your question. If you are truly concerned have you asked for an mri? Or a gastroenterology consultation?
Answered on Apr 15, 2017
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Dr. Joseph Roosth
34 years experience Internal Medicine
Not if early: A ct is not sensitive enough to find very small colon growths. There is a blood test the CEA that is high in some cancers, but usually only when quite advanced and not specific to colon cancer. Now, a ct might suggest a colon cancer, however, colonoscopy is considered the gold standard for detecting colon growths. There is research into high definition ct but it is not considered a standard.
Answered on Feb 5, 2016
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