In the small bowel, 30 to 40% of bleeding is caused by abnormal blood vessels in the wall of the small bowel. These abnormal blood vessels have many names, including angioectasias, angiodysplasias, or arteriovenous malformations (AVMs).he small bowel (or small intestine) is the longest portion of the gastrointestinal (GI) tract. It is called small because it is thin or narrow compared with the large bowel (also known as the colon), but it is much longer than the large bowel (14 feet on average).
Don't forget the multiple causes of an elevated d-dimer: 1  PE/DVT. 2  Sepsis/infection. 3  Malignancy. 4  Renal disease. 5  Pregnancy. 6  MI. 7  Stroke.
1 A low or normal d-dimer test result means that there is very little of the substance that's released as a blood clot breaks up. 2  Having very little of this substance means that a blood clotting problem isn't likely. 3  A higher-than-normal d-dimer level might mean that there is a blood-clotting problem.he d-dimer test measures the amount of a substance that is released when a blood clot breaks up. The normal values listed here (called a reference range) are just a guide.