Dreading Your Colonoscopy? There Are Other Tests for Colon Cancer
Understanding Colonoscopy & Alternative Colon Cancer Screening
According to the Centers for Disease Control and Prevention, about 30 percent of people between ages 50 and 75 are not up to date with their colorectal cancer screenings. Among adults ages 45 to 49, that share is far greater, according to a study published in the Journal of the National Cancer Institute. A top reason people skip screening is that many don’t know there are tests beyond the traditional colonoscopy, a 2016 American Cancer Society survey found.
While colonoscopy is considered the gold standard, it is just one of several tools doctors and patients can use to check for colorectal cancer. When caught early, colorectal cancer is preventable and even curable. At Prosperity Health in Royal Oak, board-certified Internist and functional medicine specialist Dr. Nishath Hakim, MD helps patients understand all their colonoscopy and screening options.
Traditional Colonoscopy
Traditional colonoscopy remains the most comprehensive screening tool for detecting colorectal cancer and precancerous polyps. During this procedure, a gastroenterologist inserts a long, flexible tube with a small camera through the rectum to examine the entire colon. The procedure typically takes 30 to 60 minutes and requires bowel preparation the day before.
The major advantage of colonoscopy is that doctors can both detect and remove polyps during the same procedure. The American Cancer Society recommends that people at average risk begin regular colonoscopy screening at age 45, with repeat screening every 10 years if no abnormalities are found. Dr. Hakim works closely with experienced gastroenterologists in Royal Oak to ensure patients receive thorough pre-procedure counseling and appropriate follow-up care.
Computed Tomography (“CT Colonography”) | Virtual Colonoscopy
CT colonography, also known as virtual colonoscopy, uses advanced imaging technology to create detailed pictures of the colon and rectum. This non-invasive procedure involves a CT scan that produces cross-sectional images assembled into a comprehensive view of the colon. Patients still need bowel preparation similar to traditional colonoscopy, but no sedation is required.
Virtual colonoscopy can detect polyps larger than 6 millimeters with good accuracy. However, if polyps or abnormalities are found, patients still need a traditional colonoscopy for removal or biopsy. The procedure is generally recommended every five years for average-risk patients. This option appeals to patients concerned about the invasive nature of traditional colonoscopy or those who cannot safely undergo sedation.
Blood Test for Colon Cancer
Recent advances have led to blood tests that detect circulating tumor DNA associated with colorectal cancer. These tests look for specific genetic changes that cancer cells shed into the bloodstream. While promising, blood tests are still being refined and are not yet widely recommended as primary screening tools.
Current blood tests have limitations in detecting early-stage cancers and smaller polyps compared to other screening methods. They may be most useful for patients unable or unwilling to undergo other forms of screening. The tests are typically performed annually and require follow-up with colonoscopy if abnormalities are detected.
Sigmoidoscopy
Flexible sigmoidoscopy examines only the lower portion of the colon, specifically the sigmoid colon and rectum. This procedure is shorter than a full colonoscopy, typically taking 10 to 20 minutes, and often requires less extensive bowel preparation. Some patients may not need sedation.
Sigmoidoscopy can detect polyps and cancer in the lower colon, where approximately 60 percent of colorectal cancers develop. However, it cannot visualize the entire colon, potentially missing abnormalities in the upper portions. The American Cancer Society recommends sigmoidoscopy every five years, often combined with annual stool testing.
Home “Colonoscopy” Stool Tests
Home-based stool tests offer a convenient and non-invasive screening option that patients can complete in privacy. These tests detect hidden blood or abnormal DNA in stool samples that might indicate the presence of polyps or cancer. While they cannot replace the comprehensive evaluation provided by colonoscopy, stool tests serve as an important screening tool.
Stool tests are particularly valuable for patients who are reluctant to undergo invasive procedures or have medical conditions that make colonoscopy risky. They are recommended annually and provide an accessible entry point for colorectal cancer screening. However, positive results require follow-up with colonoscopy for definitive diagnosis.
Guaiac-Based Fecal Occult Blood Test (Gfobt)
The guaiac-based fecal occult blood test detects hidden blood in stool samples using a chemical reaction. Patients collect small stool samples on special cards over three consecutive days, typically avoiding certain foods and medications that could interfere with test results. The test is performed annually and is one of the most widely available stool-based screening options.
While GFOBT is inexpensive and easy to use, it has limitations in sensitivity and can produce false-positive results from dietary factors or medications. Despite these limitations, studies show that regular GFOBT screening can reduce colorectal cancer deaths by 15 to 33 percent.
Stool DNA or RNA tests (FIT-DNA Test)
Stool DNA tests, also known as FIT-DNA tests, detect both hidden blood and abnormal DNA changes associated with colorectal cancer and polyps. These tests are more sensitive than traditional stool blood tests and can detect a broader range of abnormalities. The most commonly used stool DNA test is recommended every three years.
FIT-DNA tests require only one stool sample and do not require dietary restrictions or medication modifications. They can detect approximately 92 percent of colorectal cancers and 69 percent of advanced precancerous polyps. While more expensive than traditional stool tests, they offer improved detection rates for many patients.
Cost of Colon Cancer Screening
The Affordable Care Act requires private insurers and Medicare to cover the costs of all colorectal cancer screening tests recommended by the United States Preventive Services Task Force. This coverage includes colonoscopy, sigmoidoscopy, stool tests, and CT colonography when performed according to established guidelines.
Coverage typically includes both the screening test and any necessary follow-up procedures, such as colonoscopy after a positive stool test. However, coverage details can vary between insurance plans, and patients should verify specific benefits with their insurance providers. Dr. Hakim and our team work with patients to navigate insurance coverage and identify the most cost-effective screening options.
Colonoscopy Scheduling | Royal Oak
Colorectal cancer screening represents one of the most effective ways to prevent cancer and save lives. While traditional colonoscopy remains the gold standard, the availability of multiple screening options means that virtually every patient can find an approach that fits their needs, preferences, and medical situation. The key is beginning the conversation with a knowledgeable healthcare provider who can guide decision-making based on individual risk factors and circumstances.
If you live in the Royal Oak area and are due for colorectal cancer screening, Dr. Nishath Hakim’s holistic approach will help you decide when and which colon cancer screenings are right for you. Her expertise in functional medicine ensures that screening recommendations consider your overall health, lifestyle factors, and personal preferences. To learn more about your colonoscopy and colon cancer screening options, schedule an appointment with Dr. Hakim at Prosperity Health.







