Which screening test is commonly used for detecting colorectal cancer?

Colonoscopy is the standard screening test commonly used for detecting colorectal cancer. This procedure allows for direct visualization of the interior of the colon and rectum using a flexible tube equipped with a camera. Not only can it identify precancerous polyps and cancers, but it also enables the physician to remove polyps or take biopsies during the same procedure, which can significantly aid in early detection and prevention of colorectal cancer.

The effectiveness of colonoscopy in detecting abnormalities makes it the preferred method among medical professionals. Other tests, such as x-rays and MRIs, can be valuable for different diagnostic purposes, but they do not provide the same level of detail or ability to intervene as colonoscopy does. Blood tests may help in screening for certain markers or indicators but are not definitive for colorectal cancer detection. Thus, colonoscopy is the most recognized and reliable method for screening for colorectal cancer.