what does positive fecal occult blood test mean?
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Overview Positive result. A fecal occult blood test is considered positive if blood is detected in your stool samples. You may need additional testing — such as a colonoscopy — to locate the source of the bleeding.
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Stool Guaiac The stool guaiac test finds hidden (occult) blood in the stool (bowel movement), even when you cannot see the blood yourself. It is the most common form of fecal occult blood test (FOBT) in use today.
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Fecal occult blood Fecal occult blood (FOB) refers to blood in the feces that is not visibly apparent (unlike other types of blood in stool such as melena or hematochezia).n the event of a positive fecal occult blood test, the next step in the workup is a form of visualization of the gastrointestinal tract by one of several means: 1  Sigmoidoscopy, an examination of the rectum and lower colon with a lighted instrument to look for abnormalities, such as polyps.
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Fecal Occult Blood Test A fecal occult blood test checks a stool sample for blood that can't be seen with the naked eye. Blood in the stool is a sign of bleeding in the digestive tract.This could indicate cancer, polyps, hemorrhoids, diverticulosis, or inflammatory bowel disease, also called colitis. fecal occult blood test checks a stool sample for blood that can't be seen with the naked eye. Blood in the stool is a sign of bleeding in the digestive tract.
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- What Test Results Mean A NEGATIVE result from a Hemoccult II test means that there was no evidence of occult (hidden) blood detected in your stool specimen.
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Overview The fecal occult blood test (FOBT) is a lab test used to check stool samples for hidden (occult) blood. Occult blood in the stool may indicate colon cancer or polyps in the colon or rectum — though not all cancers or polyps bleed. Typically, occult blood is passed in such small amounts that it can be detected only through the chemicals used in a fecal occult blood test. If blood is detected through a fecal occult blood test, additional tests may be needed to determine the source of the bleeding.
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Fecal Occult Blood Test First, it is more sensitive for blood. This means that given the same amount of blood in the stool, the immunologic fecal occult blood test will more frequently be abnormal. In other words, it will more frequently detect cancers and precancerous polyps. Second, it is more specific for blood.
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Overview If blood is detected through a fecal occult blood test, additional tests may be needed to determine the source of the bleeding. The fecal occult blood test can only detect the presence or absence of blood — it doesn't indicate potential sources of bleeding. Why it's done.
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- Frederick R. Jelovsek MD. When the doctor does a rectal exam and smears a stool sample on a card to test for blood in the stool, or gives you a paper to drop into the toilet to look for a color change, this is known as testing for occult gastrointestinal bleeding.
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- Occult gastrointestinal bleeding usually is discovered when fecal occult blood test results are positive or iron deficiency anemia is detected. Fecal occult blood testing methods vary, but all have limited sensitivity and specificity. The initial work-up for occult bleeding typically involves colonoscopy or esophagogastroduodenoscopy, or both.
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Medical Definition of Test, stool occult blood Medical Definition of Test, stool occult blood. Test, stool occult blood: A test to see whether there is blood in the bowel movement. Also called a fecal occult blood test: A test to check for microscopic blood in stool. (Fecal refers to stool. Occult means hidden.) Abbreviated stool OB.
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- A fecal occult blood test detects blood in the stool by placing a small sample of stool on. a chemically treated card, pad, or wipe; then a chemical developer solution is put on top. of the sample. If the card, pad, or cloth turns blue, there is blood in the stool. This test is mainly performed for colorectal cancer screening.
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What Does a Positive Fecal Occult Blood Test Mean? When the doctor does a rectal exam and smears a stool sample on a card to test for blood in the stool, or gives you a paper to drop into the toilet to look for a color change, this is known as testing for occult gastrointestinal bleeding.he most commonly used method is the guaiac-based fecal occult blood test. It usually picks up about a daily blood loss of about 10 ml (about two teaspoonfuls). Normally, there is only about 0.5 to 1.5 ml of blood a day that escapes blood vessels into the stool each day.
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Overview 1 Positive result. 2  A fecal occult blood test is considered positive if blood is detected in your stool samples. 3  You may need additional testing — such as a colonoscopy — to locate the source of the bleeding. If you had the test to screen for colon cancer and you're at average risk — you have no colon cancer risk factors other than age — your doctor may recommend waiting one year and then repeating the test. 2  Positive result. 3  A fecal occult blood test is considered positive if blood is detected in your stool samples.
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- Fecal occult blood. (Redirected from IFOBT) Fecal occult blood (FOB) refers to blood in the feces that is not visibly apparent (unlike other types of blood in stool such as melena or hematochezia). A fecal occult blood test (FOBT) checks for hidden (occult) blood in the stool (feces).
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Fecal Occult Blood Test For this reason, immunologic fecal occult blood tests have advantages over chemical fecal occult blood tests since it has fewer false positive tests. It is important to remember that having occult blood in the stool does not automatically imply that one has colon cancer or a polyp.he use of fecal occult blood tests has only one downside. Tests can be falsely positive, that is, tests that show blood in patients who don't have colon cancer or premalignant polyps.
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Fecal Occult Blood Test Center A fecal occult blood test (FOBT) is performed on samples of stool in order to detect occult blood in otherwise normalâ€“colored stool. There are two types of fecal occult blood tests: chemical and immunologic.
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- For the fecal immunochemical test (FIT), a positive result indicates abnormal bleeding in the lower digestive tract. Since this test detects only human hemoglobin, other sources of blood, such as from the diet, do not cause a positive result.
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Occult Blood In Stool Occult blood is a laboratory test to see if there is blood hidden in the stool. Testing for occult blood is usually part of every routine physical examination. It may also be done if you are having abdominal (belly) pain. Blood in the stool may be an early sign of a serious problem. Since colorectal (co-lo-REC-tull) cancer is the second leading cause of cancer deaths, early detection is essential. Some foods and dyes, beets and food colors for example, change the color of stool so that it may look like it is bloody.
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Stool guaiac test The stool guaiac test or guaiac fecal occult blood test (gFOBT) is one of several methods that detect the presence of fecal occult blood (FOB) which is blood in the feces that cannot be seen.eme, a component of hemoglobin found in blood, catalyzes this reaction, giving a result in about two seconds. Therefore, a positive test result is one where there is a quick and intense blue color change of the film.
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- A NEGATIVE result from a Hemoccult II test means that there was no evidence of occult (hidden) blood detected in your stool specimen. However, this test is not a complete cancer detection examination; it only detects blood in the stool.
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- A fecal occult blood test (FOBT) is a noninvasive test that detects the presence of hidden (occult) blood in the stool. Such blood may arise from anywhere along the digestive tract. Hidden blood in stool is often the first, and in many cases the only, warning sign that a person has colorectal disease, including colon cancer. There are two types of FOBTs: 1) the traditional smear test, and 2) the newer, flushable pads.
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Fecal Occult Blood Test A fecal occult blood test checks a stool sample for blood that can't be seen with the naked eye. Blood in the stool is a sign of bleeding in the digestive tract. This could indicate cancer, polyps, hemorrhoids, diverticulosis, or inflammatory bowel disease, also called colitis. fecal occult blood test uses chemicals to find out if there is blood in a sample of feces. If your test is negative, your result is normal. If your test is positive, you had blood from your digestive tract in your stool sample.
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Fecal Occult Blood Test Even if your test results are different from the normal value, you may not have a problem. To learn what the results mean for you, talk with your health care provider. A fecal occult blood test uses chemicals to find out if there is blood in a sample of feces. If your test is negative, your result is normal.
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Fecal Occult Blood Test 1 As a result, a positive chemical fecal occult blood test can be caused by bleeding anywhere in the stomach or intestines, but a positive immunologic fecal occult blood test only occurs when there is bleeding into the colon. chemical fecal occult blood test is inexpensive and easy, but it has several disadvantages. 1  Substances in fruits and vegetables can mimic heme and cause chemical fecal occult blood tests to be falsely positive, that is, falsely abnormal.
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