A member asked:

I just had a colonoscopy this year it came out fine. my doc. did a blood test last month and it came back positive. could i get cancer that fast?

6 doctors weighed in across 3 answers

Uh, wait...: No blood test is diagnostic for colon cancer. Possibly your CEA was a bit high but that proves nothing if you're not a smoker; otherwise i must assume there is a misunderstanding. Life's tough enough without having a worry like this one. Any doubts, get a second opinion.

Answered 2/13/2015

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Unlikely: But there are a lot of reasons for blood in the stool. Certainly colonoscopy is not 100% as well. I am sure your doctor is working through the possible causes.

Answered 8/23/2013

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Dr. Arthur Heller answered

Specializes in Gastroenterology

What test?: There is no blood test for colon ca. Cea can be a marker for colon ca as well as many other conditions, including benign (not cancer). Can't diagnose colon ca just by using cea; can help monitoring colon cancer patients once a diagnosis has been made, i.e. Biopsy proved mass. Colonoscopy is best test, but not perfect-can have a miss rate of abnormalities, including polyps and cancer.

Answered 9/13/2019

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