I queried on hypercoagulation (as I saw this term in a recent post) and found about a dozen threads that contain the term, but none were actually devoted to the subject, so I thought I would start this thread. I have to say that I did not realize that hypercoagulation was a symptom of ME/CFS? Is it? I knew of low blood volume in some PWC, is this related or causative? I experienced a very dreadful pulmonary embolism in 2000. Nearly lost my life that night. I was on warfarin for 6 months. The doctors were surprised at how long it took for the clots to dissapate and be reabsorbed by my system. They told me it should take 6-8 weeks, but it took 6 months. They found my PE odd as it was not a large clot that had hit my lungs but large numbers of small clots, and they hit both lungs. I had one lung completely blocked and the other was more than half blocked when I got to the ER. I was told that they checked for DVT and some genetic clotting disorder and found nothing. They blamed the cause on my starting birth control pills (which I had started about 2 months prior). Now I think they must not have run all the right tests. How does one test for hypercoagulation? TIA for any guidance.