What is this test ?
Colorectal cancer is cancer of the colon (the main part of the large intestine) and rectum (the passageway connecting the colon to the anus).
Why do this test ?
Colorectal cancer is the most common cancer among men and women in Singapore.
Who should do this test ?
If you do not show any symptoms ( eg. change in bowel habit, bleeding from the rectum) and are not considered to be at high risk, you should undergo screening for colorectal cancer from the age of 50.
If you are at high risk , you will need to go for screening at a younger age and at more frequent intervals. Please consult your doctor for advice.
You are at high risk if one or more of your close relatives have colorectal cancer or an
abnormal growth (colorectal polyps) in their large intestine.
Women who have had cancer of the womb, ovaries or breast may have a slightly higher risk of colorectal cancer.
How is the test done ?
Several different tests can be used. Each can be used alone. Usually, Faecal Occult Blood Test is used first and if positive, it will be followed by one of the other tests.
● Faecal Occult Blood Test (FOBT)
This is a test for the presence of blood in stool. When test results are positive, colonoscopy may have to be performed.
● Double-contrast barium enema
This is an x-ray examination of the large intestine using a special substance to improve images.
● Flexible Sigmoidoscopy
This procedure examines the internal lining of the lower end of your large intestine. A short, flexible, lighted tube is inserted into your rectum and slowly guided into your sigmoid colon.
● Colonoscopy
A longer, flexible lighted tube is used. This enables the entire large intestine to be examined.
Please consult your doctor about the further tests as more detailed preparation is needed before the procedure.
