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When seeing a colorectal cancer doctor in Singapore, one of the tests they may recommend for you is a colorectal cancer stool sample test especially if you have a risk factor for colorectal cancer. Usually, it’s recommended for people aged 50 and older, or those at higher risk due to family history or other factors.
Now, a colorectal cancer stool sample test examines feces for signs of colorectal cancer or polyps. These tests are typically done at home which makes them more convenient than procedures like colonoscopies.
The test checks for hidden blood in the stool or abnormal DNA from cancerous or precancerous cells. While easier to perform, stool tests need to be done more frequently.
If the test result is positive, a follow-up colonoscopy is required to confirm if cancer is present. In this article, we explain how to prepare for your next colorectal cancer stool sample test. Keep reading!
What is the Prep for Colorectal Cancer Stool Sample Test?
There are several instances when you may be recommended colorectal cancer stool sample tests. Like many other people, a key question that may pop up is; what is the prep for colorectal cancer stool sample test?
The simple answer is there are no specific special preparations you need to do for a stool sample test. However, if you’re recommended a stool sample test, the test will come with specific instructions for you to follow. The instructions will vary considerably depending on the stool test you’re having.
The most common stool tests for colorectal cancer include stool DNA tests, fecal occult blood (fecal immunochemical test (FIT)) tests, and the guaiac smear test (gFOBT). Here is a quick roundup of what you should expect when recommended a colorectal stool sample test depending on the specific test.
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Stool DNA Test
The stool DNA test looks for genetic changes in the stool that might indicate the presence of colorectal polyps or cancer. Follow these steps for a stool DNA test:
- Prepare the Container: Place a special container inside your toilet to catch the bowel movement.
- Collect the Sample: Collect an entire bowel movement in the provided container.
- Seal the Container: Close and seal the container securely to prevent contamination.
- Mail the Sample: Send the sealed container with the stool sample to the lab for testing, following the mailing instructions in your kit.
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Fecal Occult Blood Test (FOBT)
FOBTs are used to check for blood that is hidden in the stool. There are three primary methods: the fecal immunochemical test (FIT), the guaiac smear test (gFOBT), and the flushable reagent pad or tissue
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Fecal Immunochemical Test (FIT)
The FIT is designed to detect hidden blood in the stool. Blood in the stool is a potential indicator of polyps or colorectal cancer. Here’s how to perform the test:
- Collect Samples: Obtain samples from two or three separate bowel movements. This increases the likelihood of detecting intermittent bleeding.
- Use the Brush or Device: Use the special brush or device provided in your kit to collect the sample from the surface of the stool in the toilet.
- Brush Onto Test Card: For each sample, use the brush or device to transfer the sample onto the test card provided.
- Label and Seal: Properly label and seal all your samples according to the instructions in your kit.
- Mail the Samples: Send the sealed samples to your healthcare provider or the designated lab as directed.
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Guaiac Smear Test (gFOBT) Instructions
The guaiac smear test (gFOBT) also detects hidden blood in stool which may indicate polyps or colorectal cancer. It involves smearing stool on a test card and sending it to a lab. Test instructions are as follows;
- Collect Samples: Collect samples from three separate bowel movements.
- Store Properly: Store each sample in a clean container, ensuring no contamination with urine or toilet water.
- Use the Applicator: Use the applicator provided to smear some stool on the test card or slide.
- Label and Seal: Label and seal all samples according to instructions.
- Mail the Samples: Send the samples to your healthcare provider or lab for analysis.
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Flushable Reagent Pad or Tissue
The flushable reagent pad or tissue is a convenient at-home test for detecting hidden blood in the stool, which may indicate colorectal polyps or cancer. Available without a prescription, this kit allows you to conduct the test over three consecutive days.
- Place the Pad or Tissue: After each bowel movement, place the pad or tissue in the toilet bowl.
- Observe for Color Change: The pad will change color if blood is in the stool.
- Report Results: Record any color changes and report these to your doctor using a mail-in form included with the kit.
What should you not do Before a Stool Test?
Proper preparation for your colorectal cancer stool test is very important to help avoid any false negatives or positives and ensure optimal accuracy. So, what should you not do before a stool test?
Before a colorectal cancer stool sample test, especially a fecal occult blood test, certain foods, supplements, and medications can impact your results. To ensure accurate results, follow your doctor’s instructions closely. For about three days before the test, avoid the following:
- Red meat: This can cause false-positive results.
- Certain fruits and vegetables: Such as broccoli and turnips, can affect test outcomes.
- Pain relievers: Avoid aspirin, ibuprofen (Advil, Motrin IB), and similar medications.
- Vitamin C supplements: These can interfere with test accuracy.
These precautions help prevent false positives (indicating blood is present when it isn’t) and false negatives (missing actual blood presence).
For a stool DNA test, you don’t need any special preparation. You can eat, drink, and take your usual medications without any changes.
There’s no need to clean out your colon before this test. Follow the outlined guidelines for your specified colorectal cancer stool test to ensure your results are as accurate as possible. If you have any doubts, always consult your doctor for specific instructions tailored to your situation.
It is a Wrap!
Do you have any questions about colorectal cancer stool sample tests? Get in touch today to arrange for your appointment. See our location and contact details below.
Dr. Lee Chin Li-Lee Surgery and Endoscopy | Colorectal Surgery | Gallbladder Surgery Singapore
6 Napier Rd, #04-16 Gleneagles Medical Centre,
Singapore 258499
