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"Test Limitations: The test identifies that blood is present, but it cannot determine exactly where the blood originated. [1]"...... An anal fissure will often cause a heme-positive (occult blood) stool test because the tear creates active bleeding that contaminates the sample. It is a very common cause of a false positive result for things like colorectal cancer screening, making the test less reliable if you have a known fissure.Why the Test Becomes "Positive"Source of Blood: Fecal occult blood tests (FOBT) or fecal immunochemical tests (FIT) look for microscopic blood anywhere in your digestive tract.The Fissure: Since an anal fissure is right at the end of your digestive tract (the anus), any blood from the tear easily coats the stool as it passes, triggering a positive result.Test Limitations: The test identifies that blood is present, but it cannot determine exactly where the blood originated.Accuracy ConsiderationsInterference: If you are taking the test for colorectal cancer screening, the presence of a fissure renders the test results inaccurate for that specific purpose. The test is essentially "accurate" at finding blood, but the blood is coming from a benign source (the tear) rather than a polyp or tumor.Prioritization: Doctors typically advise against taking a stool test while you have an active fissure, hemorrhoids, or are actively bleeding.Next StepsIf you recently received a heme-positive result and know you have an anal fissure, it is important not to panic. The blood is likely just from the tear. However, to ensure nothing else is going on higher up in the digestive tract, your doctor may still recommend further investigation, such as a colonoscopy, to rule out other causes of bleeding once the fissure has healed.For the most accurate assessment of your symptoms, review your test results and medical history directly with a healthcare provider.

AI google: An anal fissure will often cause a heme-positive (occult blood) stool test because the tear creates active bleeding that contaminates the sample. It is a very common cause of a false positive result for things like colorectal cancer screening, making the test less reliable if you have a known fissure. [1, 2, 3, 4]
Why the Test Becomes "Positive"
  • Source of Blood: Fecal occult blood tests (FOBT) or fecal immunochemical tests (FIT) look for microscopic blood anywhere in your digestive tract. [1, 2]
  • The Fissure: Since an anal fissure is right at the end of your digestive tract (the anus), any blood from the tear easily coats the stool as it passes, triggering a positive result. [1, 2, 3, 4]
  • Test Limitations: The test identifies that blood is present, but it cannot determine exactly where the blood originated. [1]
Accuracy Considerations
  • Interference: If you are taking the test for colorectal cancer screening, the presence of a fissure renders the test results inaccurate for that specific purpose. The test is essentially "accurate" at finding blood, but the blood is coming from a benign source (the tear) rather than a polyp or tumor. [1, 2, 3]
  • Prioritization: Doctors typically advise against taking a stool test while you have an active fissure, hemorrhoids, or are actively bleeding. [1, 2]
Next Steps
If you recently received a heme-positive result and know you have an anal fissure, it is important not to panic. The blood is likely just from the tear. However, to ensure nothing else is going on higher up in the digestive tract, your doctor may still recommend further investigation, such as a colonoscopy, to rule out other causes of bleeding once the fissure has healed. [1, 2]
For the most accurate assessment of your symptoms, review your test results and medical history directly with a healthcare provider.

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