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Fecal occult blood test is indicated when the patient has gastrointestinal abnormalities leading to blood in the stool. Fecal occult blood test is indicated to screen for colorectal cancer in at-risk subjects.
1. An overview of fecal occult blood tests
Fecal Occult Blood Test (FOBT) is a test that allows to find and determine whether there is blood in the stool. The amount of blood found in the stool is so small that it cannot be easily seen with the naked eye, and must be used with a microscope and reagents.
2. In what cases is the fecal occult blood test indicated?
Some gastrointestinal diseases can cause bleeding and blood is excreted in the stool. Blood can appear in the stool in the early stages of the disease in very small amounts and is difficult to see because the amount of blood is so small that it does not change the color of the stool. However, when the disease progresses to a severe stage, it is possible to see the stool mixed in the blood because the large amount of blood changes the size, character and color of the stool.
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Fecal occult blood test is indicated in the following cases:
Family history of cancer in the digestive tract. You have ever had inflammatory bowel disease or other gastrointestinal conditions that can cause bleeding in the digestive tract such as: stomach ulcers, stomach cancer, ulcerative colitis, colon cancer. Gastrointestinal abnormalities such as: prolonged abdominal pain causing fatigue, nausea or vomiting, bleeding in the anus, abnormal bowel movements, unexplained weight loss. Screen for colorectal cancer and gastrointestinal cancer when symptoms are not present. Have diabetes or increased insulin in the blood.
3. Procedure for performing fecal occult blood test
The procedure to test for occult blood in the stool is done as follows:
Step 1: The patient collects a stool sample (a very small amount) by using a stripper and putting it in a test vial and sending it to the testing facility. . Step 2: The laboratory technician receives the sample and conducts the test within 2 hours after receiving it or within 24 hours (in storage conditions of 2 - 8 degrees Celsius). Step 3: At the laboratory, the test technician uses chemicals to change the color of the stool and observe. Step 4: The fecal occult blood test can be performed 2-3 times on 2-3 stool samples taken at different times to ensure no false negative results and accurate results. than.
4. Read fecal occult blood test results
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The specific fecal occult blood test results are as follows:
Negative: It means that the test did not find stool mixed in the blood. However, it is necessary to perform periodic tests to screen and detect gastrointestinal diseases when symptoms are present. Positive: Means the test found stools mixed in blood. However, the results did not indicate where in the GI tract the bleeding occurred. In order to accurately diagnose the cause of bleeding, the doctor will appoint the next procedure to proceed such as gastroscopy or colonoscopy, blood tests to look for lesions in the digestive tract such as inflammation, cancer. or bleeding, ... However, the results of fecal occult blood test can be affected by the following factors:
Use of certain drugs such as vitamin supplements, pain relievers. Eating certain foods like blood pudding can give false positives. Therefore, patients should note and notify the doctor and testing facility before performing the test.
5. The role of fecal occult blood test in colorectal cancer screening
People between the ages of 40 and 75 are recommended to undergo colorectal cancer screening with a fecal occult blood test when the disease has no symptoms, in order to detect the disease early and improve the chances of treatment.
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Especially, in case the patient has gastrointestinal abnormalities such as abdominal pain, diarrhea for a long time, stool changes in size, color, sudden weight loss for unknown reasons. soon seek medical attention for examination and be assigned to perform a fecal occult blood test to screen for early detection of colorectal cancer in particular and gastrointestinal cancer in general.
Fecal occult blood test is indicated in patients with gastrointestinal diseases such as gastric and duodenal ulcers, or when there are abnormalities such as frequent abdominal pain, diarrhea, vomiting, nausea, weight loss Therefore, when there are signs of gastrointestinal diseases, patients should go to reputable medical facilities to perform fecal occult blood tests and screening for gastrointestinal diseases.
Gastrointestinal cancer screening is a scientific and effective measure for early detection of gastrointestinal cancers (esophageal cancer, stomach cancer, colon cancer) and providing a good treatment plan. best. Currently, Vinmec International General Hospital has a package of screening and early detection of cancers of the gastrointestinal tract (esophagus - stomach - colon) combined with clinical and paraclinical examination to bring the most accurate results. maybe.
When screening for gastrointestinal cancer at Vinmec, you will receive:
Gastrointestinal specialty examination with an oncologist (by appointment). Gastroscopy and colonoscopy with an NBI endoscope with anesthesia. Peripheral blood count (laser counter). Automated prothrombin time test. Automated thrombin time test. Activated Partial Thromboplastin Time (APTT) test using an automated machine. General abdominal ultrasound To register for screening and treatment of gastrointestinal diseases at Vinmec International General Hospital, you can contact Vinmec Health System nationwide, or register for an online examination. .
Please dial HOTLINE for more information or register for an appointment HERE. Download MyVinmec app to make appointments faster and to manage your bookings easily.
