There are five tests that can screen for colorectal cancer, according to the National Cancer Institute1:

1. Colonoscopy:
   Uses a thin tube to check for polyps or cancer inside the rectum and the colon. Doctors can remove polyps and some cancers if found during the test. Should be done every 5-10 years; talk to your doctor if you’re at greater risk for CRC.
2. DNA stool test:
   Tests for abnormal DNA, genetic changes and blood in stool by collecting and sending back to a lab for analysis. Should be done every 3 years.
3. Fecal occult blood test (FOBT)/Fecal immunochemical test (FIT):
   Checks a patient’s stool for blood under a microscope. Blood in one’s stool may be a sign of cancerous polyps or another condition. Read more below about different types of screening tests.2 Should be done annually. 
4. Sigmoidoscopy: 
   Looks inside the rectum3 and lower colon4 for polyps or cancer. A thin tube is inserted through the rectum into the sigmoid colon. A tool is used to remove polyps or tissue5 samples, which are checked under a microscope for signs of cancer. Should be done every 5 years. 

Virtual colonoscopy:
Uses a series of x-rays to make pictures of the colon. These detailed images may show polyps and abnormalities in the colon.

CRC Screening Resources:

• Colorectal Cancer Alliance screening chart 
• CDC: Colorectal cancer testing options
• American Cancer Society guidance on colorectal cancer screening
• Health.gov colorectal cancer testing info

1. National Cancer Institute

2. Different types of screening tests

3. Rectum

4. Colon

5. Tissue

6. X-rays