I have had several D-Dimer tests done within the past two months. They all showed that my d-dimer tests were amazingly high 3.38 EACH. My doctors (cardiogists, pulmonary doctors, family doctor) did extensive tests on me such as pulmonary function, cat scan, xray, catherer and VQ scan to check for blood clots. They all came out negative. I have this breathing problem. Are there other causes for my D-dimer test to be this high? Please let me know. YYYY@YYYY