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Your doctor can usually differentiate between melena and hematochezia by simply looking at a stool sample.

Based on the color of the blood, they’ll do additional testing to narrow down a diagnosis.

If you have hematochezia, your doctor will likely start with a colonoscopy.

Lower abdominal pain and blood in stool

This involves inserting a small tube with a camera through your rectum. The device will give them a view of your lower GI tract, including your colon, so they can pinpoint where the blood is coming from. During the procedure, they may also take a small tissue sample for additional testing.

Other tests used to diagnose the cause of hematochezia include:

• Enteroscopy. You’ll swallow a small capsule containing a camera that produces images of your GI tract.
• Barium X-ray.

  Your doctor will have you swallow a contrast material called barium.

  Abdominal pain and blood in stool female

  They might also insert it into your rectum. This will help your GI tract show up on an X-ray.

• Radionuclide scanning. A small amount of radioactive material is injected into a vein while y
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