The doctor pointed out that the fecal occult blood test is to check whether there is blood invisible to the naked eye on the surface of the stool. Because the tumor or polyp of colorectal cancer will bleed when it is rubbed by the stool, the blood will adhere to the surface of the stool and be discharged. Therefore, the test can detect colorectal cancer or polyp early. Polyp case; schematic diagram.

(picture taken from shutterstock)

[Health Channel/Comprehensive Report] Does diet affect the detection of fecal occult blood?

Chen Weiyou, director of Tianshen Colorectal Surgery Clinic, said that this is actually a misconception. Fecal occult blood test is to check whether there is blood invisible to the naked eye on the surface of the stool. Because the tumor or polyp of colorectal cancer will bleed when it is rubbed by the stool, the blood will adhere to it. It is excreted on the surface of feces, so cases of colorectal cancer or polyps can be detected early through fecal occult blood tests.

Chen Weiyou posted on his Facebook fan page "Dr. Chen Weiyou of Colorectal Surgery" that colorectal cancer is the most common cancer in Taiwan, and the most effective way to prevent it is to do regular fecal occult blood tests.

He found that many people think that they often eat duck blood to test positive for fecal occult blood, and they did not go for colonoscopy after that, but doing so may delay the treatment of colorectal cancer, and they also ignore that they may have other gastrointestinal diseases question.

Please read on...

Some people think that diet will affect the results of fecal occult blood, but Chen Weiyou pointed out that this is actually a misconception, and such rumors spread mainly because they do not understand the detection method of fecal occult blood.

He explained that the fecal occult blood test is to check whether there is blood invisible to the naked eye on the surface of the feces. Since the tumor or polyp of colorectal cancer will bleed when it is rubbed by the feces, the blood will adhere to the surface of the feces and be discharged, so the fecal occult blood test can be used for early detection Cases of colorectal cancer or polyps.

Fecal occult blood test is divided into 2 types according to the reaction principle 

Fecal occult blood test can be divided into "chemical method" and "immune method" according to the reaction principle. Subjects of the chemical method should avoid eating excessive meat, poultry, fish, green leafy vegetables, and high peroxidase within 24-48 hours. Vegetables: Bananas, beets, cauliflower, cantaloupe, grapes, mushrooms, parsnip roots, radishes, these foods may cause false positives; excessive vitamin C may also cause false negatives.

Chen Weiyou pointed out that since the 1970s, immunoassays have been developed to detect fecal occult blood.

Fecal occult blood test by immunological method uses monoclonal antigen antibody to detect whether human red blood cells are contained in stool.

Due to its high specificity and convenient detection, it gradually replaced the chemical method after it was approved by the US Food and Drug Administration (FDA) in 2000.

The immunization method is only applicable for colorectal cancer, and there is no need to restrict diet before the test

The immunization method is currently recommended by the National Health Administration for colorectal cancer screening.

Fecal occult blood reaction by immunological method is only suitable for screening of colorectal cancer and microbleeding of lower gastrointestinal tumors. The antibody only targets fresh hemoglobin, so the black denatured hemoglobin from gastric ulcer bleeding through the digestive tract is a negative reaction, and there is no need to test it Make special restrictions on diet before sampling.

Therefore, there is no need to adjust the diet before doing the fecal occult blood test, and there is no need to worry about eating specific foods that will affect the test results.

The National Health Administration currently subsidizes people aged 50-75 to do an immunological fecal occult blood test every 2 years.

It is recommended that qualified friends can make more use of it, and regular testing can take care of gastrointestinal health.

If the fecal occult blood test is positive, further colonoscopy is required

No matter what kind of occult blood reaction, the sensitivity and specificity are not 100%, so if the occult blood reaction is positive, it does not mean that the subject must have gastrointestinal bleeding, and it does not mean that the subject must have intestinal cancer.

Chen Weiyou reminded that as long as the result of fecal occult blood is positive, other tests such as colonoscopy should be done further.

Don’t take it lightly if you are negative. If you have recently found mucus in your stool, thinner stool, change in bowel habits, weight loss, and anemia, and the symptoms last for more than two weeks, you should also undergo a colonoscopy as soon as possible to ensure Digestive tract health.

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  • colorectal cancer

  • gastric ulcer

  • colorectal cancer

  • fecal occult blood test

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