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Colonoscopy 101
2008-02-22来源:
Similar to a sigmoidoscopy, this test uses a longer tube and examines the full length of the colon. It's usually done only for people at high risk of colorectal cancer and those who have gotten positive results on their fecal occult blood test or sigmoidoscopy.
Who needs it The American Cancer Society recommends having this test every 10 years starting at age 50. Your doctor may want you to start at age 40 if you have more than one first-degree relative with colorectal cancer or other bowel disease. Most insurance companies won't pay for the test unless you have a family history of colon cancer or disease symptoms.
How it's done You'll be on a clear liquid diet for 48 hours beforehand, drink a laxative solution the prior night, and use an enema in the morning. You'll receive an IV containing pain medication and a sedative. After the doctor inserts the colonoscope, images appear on a TV monitor for the doctor to examine. The test takes about 30 to 60 minutes. You'll need to rest for an hour or two afterward until the sedative wears off.
Some doctors now use a new technology called virtual CT colonography to detect tumors. The technique, which is less invasive, requires no sedative and takes only about 10 minutes. The clean colon is inflated with air by means of a small, soft-tipped tube inserted into the rectum. Then you hold your breath while you are moved through a CT scanner, which produces digital images of the entire colon. Although researchers have found results to be 90 percent accurate, a positive diagnosis for cancer is usually followed up with a standard colonoscopy anyway.
What the results mean Any polyps (benign growths) the doctor finds may be removed during the exam with a device inserted into the colonoscope. Another device may be used to obtain cell samples from any suspicious lesions for biopsy.
Who needs it The American Cancer Society recommends having this test every 10 years starting at age 50. Your doctor may want you to start at age 40 if you have more than one first-degree relative with colorectal cancer or other bowel disease. Most insurance companies won't pay for the test unless you have a family history of colon cancer or disease symptoms.
How it's done You'll be on a clear liquid diet for 48 hours beforehand, drink a laxative solution the prior night, and use an enema in the morning. You'll receive an IV containing pain medication and a sedative. After the doctor inserts the colonoscope, images appear on a TV monitor for the doctor to examine. The test takes about 30 to 60 minutes. You'll need to rest for an hour or two afterward until the sedative wears off.
Some doctors now use a new technology called virtual CT colonography to detect tumors. The technique, which is less invasive, requires no sedative and takes only about 10 minutes. The clean colon is inflated with air by means of a small, soft-tipped tube inserted into the rectum. Then you hold your breath while you are moved through a CT scanner, which produces digital images of the entire colon. Although researchers have found results to be 90 percent accurate, a positive diagnosis for cancer is usually followed up with a standard colonoscopy anyway.
What the results mean Any polyps (benign growths) the doctor finds may be removed during the exam with a device inserted into the colonoscope. Another device may be used to obtain cell samples from any suspicious lesions for biopsy.
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