question: Hello doctor, I was recently diagnosed with a blood clot in my left jugular vein and put on Eliquis (10 mg twice daily for a week, now 5 mg twice daily). I was also recently diagnosed with some sort of autoimmune disorder, but it is not clear yet which one. After being diagnosed with the blood clot, my rheumatologist performed a lupus anticoagulant panel to see if I am taking the correct blood thinners. Everything came back normal except the dRVVT which was prolonged with 52.2 seconds. The dRVVT mix was 45 seconds and I was told that it is negative. I have read a lot about dRVVT testing online now and I am concerned that I am still LA positive because the mix can show false negatives. I have also read that converting the results into a ratio is preferred. Also, my aPTT was slightly elevated (37seconds). I have no risk factors for blood clots (normal weight, no hormonal birth control). What is your opinion? Do I need further testing? How likely is it that I should be taking different blood thinners?