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Doctor insights on: Can A Blood Test Detect Colon Cancer

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How does an iscreen fecal occult blood test detect colon cancer?

How does an iscreen fecal occult blood test detect colon cancer?

No: A fecal occult test tests for blood in the stool. Colon cancer can be a cause but so can colon polyps, hemorrhoids, stomach ulcer and many other causes. Anyone with a positive fobt test should have further work up done to evaluate where the blood is coming from. ...Read more

Dr. Barry Rosen
4,351 Doctors shared insights

Cancer (Definition)

Cancer is a group of diseases that is characterized by uncontrolled cell growth leading to invasion of surrounding tissues that spread to other parts of the body. Cancer can begin anywhere in the body and is usually related to one or more genetic mutations that allow normal cells to become malignant by interfering with internal cellular control mechanisms, such as programmed cell death or by preventing ...Read more


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Blood test for constipation from colon cancer?

Blood test for constipation from colon cancer?

No good test: There is no good blood test for either constipation or colon cancer. In late colon cancer CEA levels are usually elevated, but there are other causes of elevated cea. ...Read more

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I had a blood test done at my doctor and everything was normal. He said this means I probably don't have Colon cancer. Could I still have colon cancer?

I had a blood test done at my doctor and everything was normal. He said this means I probably don't have Colon cancer. Could I still have colon cancer?

Yes: To rule in or out colon cancers, colonoscopy is mandatory. That said, given your age it is not likely that you have colon cancer. Your family history and your symptoms may help in deciding if you do need a colonoscopy. ...Read more

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Can colon cancer be diagnosed on a fecal occult blood test?

Can colon cancer be diagnosed on a fecal occult blood test?

FOBT is screen: Fobt is designed to test for blood in stool. Blood in stool may be due to any bleeding in the GI tract from the gums to the anus; and there are false positives also. If fobt is positive, colonoscopy is generally recommended to look of colon cancer. Fobt per se is not a diagnostic test for cancer, just blood in stool. ...Read more

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Can a fecal occult blood test tell me if I have colon cancer?

Can a fecal occult blood test tell me if I have colon cancer?

No: Occult blood in stool suggests a point of bleeding from area near appendix across the colon to the rectum. This could be AV malformation, bleeding polyp, tumor, hemmorhoid or fissure. When blood is detected it has to be defined as to origin. Occassionally colonoscopy will reveal a lesion. Newer stool tests for tumor protein more accurate. ...Read more

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Could a fecal occult blood test tell me if I have colon cancer?

Could a fecal occult blood test tell me if I have colon cancer?

Well..: It could show blood in the stool which could mean cancer but not all blood in the stool means cancer and not all colon cancers will have a positive test. Blood in the stool, especially if the patient is anemic, should be evaluated further. ...Read more

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I have stage 2 colon cancer and just had a colectomy the oncologist is performing an expensive blood test to see next steps what is this test?

I have stage 2 colon cancer and just had a colectomy the oncologist is performing an expensive blood test to see next steps what is this test?

Just ask: May be a CEA level. This is a marker commonly used to follow colorectal cancer patients to indicate a possible recurrence. In sure your oncologist would be happy to explain it to you. All you have to do is ask. Best if luck. Hope this helps! ...Read more

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Could a simple blood test in arm tell if you have stomach or colon cancer?

Could a simple blood test in arm tell if you have stomach or colon cancer?

Depends: A blood count may show anemia than can in turn be traced to a cancer anywhere in the GI tract. Also, if the cancer is advanced, tumor markers or liver enzyme tests may be abnormal. As a rule, blood tests are not good screening methods for cancer, it's mostly luck if they find cancer early. Good question, by the way. ...Read more

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Does a intestinal or colon cancer show in a blood test thru the WBC? And if there is no bleeding is it possible to be cancer?

Does a intestinal or colon cancer show in a blood test thru the WBC? And if there is no bleeding is it possible to be cancer?

No and yes: There is a blood test that we use in colon cancer, however it is not advised for screening.

There can be colon cancer without bleeding. Only 25% of colon cancers present with bleeding. ...Read more

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Doctor said to my dad he have colon cancer but the biopsy result was ok it show that is just polip. His blood test was ok aswell. What we should do now?

Doctor said to my dad he have colon cancer but the biopsy result was ok it show that is just polip. His blood test was ok aswell. What we should do now?

Repeat colonoscopy: Unless the pathology report comes back on the polyp as showing malignancy, he will need to have a follow-up colonoscopy to look for new polyps in the future (1-3 years). The timing will depend on risk factors, such as a history of ulcerative colitis, strong family history, completeness of colonoscopy, biopsy findings. If the pathology shows cancer, he should see a colorectal or general surgeon. ...Read more

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Wouldn't a blood test or cat scan show stomach or colon cancer.?

Wouldn't a blood test or cat scan show stomach or colon cancer.?

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. ...Read more

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19, male having diarrhea right after normal stool, watery, blood test fine, no blood or constipation, can it be colon cancer I'm scared!!!

19, male having diarrhea right after normal stool, watery, blood test fine, no blood or constipation, can it be colon cancer I'm scared!!!

Relax: Colon cancer doesn't behave this way and is very, very rare in 19 year olds. Diarrhea after a normal BM is not unusual and often depends on diet, anxiety, etc. If it persists, see your primary care provider for an evaluation. Thanks for trusting HealthTap! ...Read more

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My sister is on chemotherapy (folfox for metastatic colon cancer). Recent blood test shows high WBC (14, 000) and platelets (429). Is this okay?

My sister is on chemotherapy (folfox for metastatic colon cancer). Recent blood test shows high WBC (14, 000) and platelets (429). Is this okay?

No worries.: High WBC can be due to many causes: infection, stress, steroid use, dehydration, or the use of growth factor (such as neupogen). If there is no evidence of infection, then there is nothing to worry about. High platelet count is not uncommon since it is a body's reaction to stress of any cause (platelet is an acute phase reactant). Again, nothing to worry about. All the best, hk. ...Read more

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A friend has been told they have colon cancer, diagnosed via a tumour marker blood test, high cea, CT scan showed contained mass. Is this conclusive?

A friend has been told they have colon cancer, diagnosed via a tumour marker blood test, high cea, CT scan showed contained mass. Is this conclusive?

No, but...: But very suspicious for colon cancer. If your friend is similar in age to yourself a mass in the colon on ct scan is cancer until proven otherwise. And CEA levels can go up for other reasons but, given the mass, they would strongly favor cancer. But to answer your question "no"... They are not definitive. You would need a piece of the mass under a microscope to prove definitively its cancer. ...Read more

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Do I need CT scan or only blood test for stage 2 colon cancer during my follow up every 3 month for the first year? (no chemo after surgery)

Do I need CT scan or only blood test for stage 2 colon cancer during my follow up every 3 month for the first year? (no chemo after surgery)

Probably Blood test: You did not have chemotherapy, you do not have lymph node spread in you stage, curative resection was done, you CEA levels will be normal, end of the yea rwill elide, pet scan is a better modality to detect metastasis. You very good chance of being cured but require colonoscopic examinations. ...Read more

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1 Morning stool test done.2-3 pus cells. SGOT 62, No blood. Blood test-mild eosinophilia. I have lipomas in my body. Sonography normal. Colon cancer, lipoma?

1 Morning stool test done.2-3 pus cells. SGOT 62, No blood. Blood test-mild eosinophilia. I have lipomas in my body. Sonography normal. Colon cancer, lipoma?

Sketchy information: Not a picture of colon cancer, also not the age, you need a Gastroenterologist to evaluate your condition better and do more comprehensive liver enzymes workup, goodluck ...Read more

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Are occult blood tests for colon cancer reliable?

Are occult blood tests for colon cancer reliable?

Screening: It is a good start specially of yo had before and they were normal. ...Read more

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Are occult blood tests for colon cancer effective?

Are occult blood tests for colon cancer effective?

Guaiacs-: Are actually tests of thin films of stool to discern if there is hidden blood beneath visiblity, so-called "occult blood". It is a great screen, that if positive leads to a closer, less comfortable, more expensive test: colonoscopy. After 50, you get one per decade without occult blood in stool! ...Read more

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What are the blood tests after being diagnosed with stage 1 colon cancer?

What are the blood tests after being diagnosed with stage 1 colon cancer?

Establishes baseline: You will almost certainly have normal liver functions, blood counts, and CEA at present, but these will be monitored into the future. Any change can be an early sign of cancer recurrence, so continue to get checkups! I have had many patients who neglected their cancer follow up and died as a result. ...Read more

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How accurately will a fecal test find early stage colon cancer? The one that looks for cancer blood markers. Please help!! Approximate percentage.

How accurately will a fecal test find early stage colon cancer? The one that looks for cancer blood markers. Please help!! Approximate percentage.

Pretty low: Conventional assessment of colorectal cancer (CRC) risk largely involves detection of non-dysplastic adenomatous polyps. Standardized sensitivity was 48.2%, for CRC stages I-IV, values were 35.0%, 63.0%, 46.0% and 77.4%, respectively. Specificity was 91.5%. Sensitivity for advanced adenomas was low (11.2%). Ref: Mol Diagn Ther. 2014 Apr;18 (2):127 & Gut. 2014 Feb;63 (2):317 ...Read more

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IFOBT test Dec 2014, no occult blood. April 2nd, 2015 minor rectal bleeding, stop 1 day after. April 17th, 2015 started again. I'm 22. Colon cancer?

IFOBT test Dec 2014, no occult blood. April 2nd, 2015 minor rectal bleeding, stop 1 day after. April 17th, 2015 started again. I'm 22. Colon cancer?

Possibly hemorrhoids: Most rectal bleed is usually from hemorrhoids, cancer is extremely rare especially at this age, but needs to be ruled out, therefore a specialist either general surgeon or gastroenterologist is necessary. ...Read more

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Had red blood, black stool 3 weeks ago for 3 days. Had hemiglobin and occult test 2 days ago and all normal. This does mean I have no colon cancer?

Had red blood, black stool 3 weeks ago for 3 days. Had hemiglobin and occult test 2 days ago and all normal. This does mean I have no colon cancer?

GI consult, EGD: Limited data available as reported. Colon cancer is rare at such an young age. Bright red blood usually from lower GI tract, or hemorrhoids, fissure etc. However black stoll is concerning for upper GI bleed. Need a GI/Gastroenterology evaluation, EGD/upper endoscopy, H Pylori testing, Upper GI series etc. Contact PCP for GI referral. Go to a health tap doctor for a formal consult with more details ...Read more

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Can chemo for colon cancer lead to painful urination (blood tests ruled out uti)? And advice to treat the pain?

Can chemo for colon cancer lead to painful urination (blood tests ruled out uti)? And advice to treat the pain?

Best is: To discuss with your oncologist regarding any known side effects of the chemo drugs being used. Pain could be related to your prior colon surgery also so a meeting with the surgeon would be reasonable as well. With no more information it is difficult to give you any more detailed answer. ...Read more

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28 yo. Colon cancer fear. No family hist. Ibs diagnosis. Have had tiny specks of blood on tp. Doc said hemmroids. Negative occult test. Do you agree?

28 yo. Colon cancer fear. No family hist. Ibs diagnosis. Have had tiny specks of blood on tp. Doc said hemmroids. Negative occult test. Do you agree?

Too young for it!: Colon care is uncommon under the age of 50 years, so you should not live under this fear when you are so young. The fact that your doctor has checked you and found hemorrhoids as the cause of your questionable bleeding. Once you get to the age of 45-50 years. Screening with Colonoscopy would be the best security to avoid any fear of this Cancer which is easily detectable and preventable. ...Read more

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What stage colon cancer has symptoms of blood in the ostomy pouch?

What stage colon cancer has symptoms of blood in the ostomy pouch?

None: Blood in an ostomy punch can be many things. Is it a colostomy or ileostomy? Why was the surgery done, history cancer or diverticulitis or colitis? How long ago was the ostomy surgery? Bleeding does indicate need for a doctor evaluation. Can be ostomy appliance irritation, colitis, etc. There is no cancer staging associated with intestinal bleeding. ...Read more

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If colon cancer was present would something show up in routine blood work?

If colon cancer was present would something show up in routine blood work?

Depends: Some times colon cancer can cause anemia and abnormal liver functions but not sensitive and specific enough. Cea is used to moniter patients with a history of colon cancer but not to make a diagnosis. ...Read more

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I have colon cancer stage 4 and I just started throwning up blood. What is it?

I have colon cancer stage 4 and I just started throwning up blood. What is it?

Not sure: Depending on your treatment history and related health problems, this has a higher probability of being very serious. Please call your oncologist now or proceed to the ER (bring any advanced directives information with you). ...Read more

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I just moved my bowels and it was really hard coming out I saw a streak of blood. Worried its colon cancer?

I just moved my bowels and it was really hard coming out I saw a streak of blood. Worried its colon cancer?

Probably not cancer: Blood streaking on a hard bm is more likely related to the local trauma of passing stool. Blood mixed inside stool is much more concerning. I would recommend a bowel program using a high fiber diet and a diet supplement like Benifiber 3-4 times a week. When stools are no longer hard, if you still see blood, or if there is a family history of colon cancer then you should have a colonoscopy ...Read more

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My dad had colon cancer. I'm 21male. I had bright to Maroon colored blood when I wipe & some in toilet. It first happened 2months ago and has returned?

My dad had colon cancer. I'm 21male. I had bright to Maroon colored blood when I wipe & some in toilet. It first happened 2months ago and has returned?

Not Ca: The presence of colon cancer based for the most part on Weinbergs 3 hit theory where unless one has a congenital form of polyposis it takes three separate events over many years to induce cancer. Maroon stools suggest a bleeding problem which could be related to vascular malformation or internal hemorrhoid. Cancer as a cause at age 20 rare. If problem persists then colonoscopy indicated. ...Read more

Dr. Janice Alexander
13 Doctors shared insights

Colon (Definition)

The colon is another term for the large intestine. This is the final portion of the digestive system, responsible for absorbing water and storing stool before evacuation. It is divided into sections described as cecum; ascending, transverse, descending and ...Read more


Dr. Shari Jackson
12 Doctors shared insights

Colonic (Definition)

This is a combining term referring to some condition, treatment or disease of the colon. Such as colonic enema, colonic ...Read more