Screening has been proven in many cases not only to prevent colorectal cancer, but also to prevent polyps or tumors before they become cancer Early detection and treatment, the sooner a regular screening detects an anomaly, the higher the chance of a successful cure.

6 Common Methods for Colorectal Cancer Screening

Guaiac-based Fecal Occult Blood Test (gFOBT) and Fecal Immunochemical Test (FIT)

Both tests check for blood reactions in stool tests, if any, which may be polyps or cancer Symptom.

Stool DNA Test

This method examines specific genetic material fragments from the stool examination to confirm cancer or long polyps.


Use a light source hose to reach the Rectum and lower part of the large intestine to check for signs of polyps and cancer in the intestine.


Use a long hose to view the entire colon and rectum.

Double Contrast Barium Enema

X-ray examination of the large intestine and rectum.
CT Colonography (or Virtual Colonoscopy)

CT Colonoscopy is one of the computed tomography View the large intestine and rectum.
Chemical stool latent blood test, immunochemistry stool blood test, fecal DNA test are the main cancer screening methods, and can also detect long polyps. sigmoid colonoscopy, colonoscopy, double contrast barium enema and computed tomography are also used to detect cancer and polyps before they can be removed. Of course, all of the above tests can be examined effectively, consult your doctor on how to recommend each patient.

How often is colorectal cancer screened?

Different medical institutions may have different recommendations on screening for colorectal cancer, so you should discuss with your doctor the best way and timing of screening according to your case and risk of cancer. Men and women over 50 years of age should be screened and prepared first.

The following screening can diagnose polyps and cancer:

Sigmoidoscopy: 1 time/5 years is recommended.
Colonoscopy: 1 times/10 years.
Double Contrast Barium Enema examination: 1 times/5 years.
Computed tomography of the colon: 1 times/5 years.

The following tests are mainly for cancer detection:

Chemical stool occult blood test: 1 times/year.
Immunochemical stool occult blood test: 1 times/year.
Faecal DNA test: Your doctor will assess the number of times.
The U.S. Preventive Services Task Force (USPSTF) has also recommended screening for colorectal cancer Guidelines, which differ somewhat from the above recommendations, the United States Task Force on Prevention Services recommends the following types and frequency of screening:

High sensitivity to stool occult blood test: 1 times/year.
sigmoidoscopy: 1 times/5 years, and every 5 years to do a stool occult blood test.
Colonoscopy: 1 times/10 years.
In addition, according to the recommendations of the US Preventive Services Working Group, the risk of regular screening for adults aged 76-85 is greater than the benefit. Therefore, it should not be done regularly. , but people with long polyps or colorectal cancer are more likely to have this cancer, so even if they are too old, screening is recommended.