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.
D-dimer levels are often higher than normal in people who have a blood clot. A low d-dimer test result may mean that a deep vein thrombosis or pulmonary embolism is less likely. A high d-dimer test result may not always be caused by a blood clot in the leg or lung. This is completed by a intravenous blood draw, so please note it you have a sensitivity to needles.