I'm not sure because while an elevated d dimers can show clotting activity it can also be elevated for completely unrelated reasons as well. Warfarin prevents new clots; it doesn't technically dissolve existing clots so if you stil have some existing clot present which is not unusual, then maybe that could explain the still elevated d dimer.

If it were me, I'd call my doc and ask if there's reason for concern.

I think sometimes there can be a thing as having too much information, when we don't quite know what it means. Im not an expert on it, but my understanding is that d-dimer numbers are next to useless if you're being treated for a clot. Like rmb said, d-dimers can be elevated for a variety of reasons even if someone doesn't have a clot, that's why it is easier to use it to rule out a clotting event and can't be used to diagnose clotting. If it were me, I really wouldn't worry about that number while you're being treated.

I also read your other discussion and agree with the others that most likely you've just overdone your physical activity and that's the reason for feeling worse. I completely disagree with the doctor who said a person in treatment shouldn't feel worse again if they've been feeling better. I felt like PE recovery was a constant process of two steps forward and one step back. The general direction was recovery, but it's a lot of up and down foe awhile. For your point in recovery, you're doing way more than most of us were, so even having a little bit of a setback, you seem to be doing fantastically well from my perspective. Still, you know your body best and if you are truly concerned the best bet is always to just consult your doctor.

I had a chronic DVT in my leg for about 9 years or so. My doctor always refused to test my d-dimer because she felt the existing clot might affect the numbers and it wouldn't be reliable. That's possibly the case for you too. If you have residual clotting that hasn't dissolved yet, the d-dimer may just not be very accurate.

Also, RMB is right that many other things can affect the d-dimer levels. It isn't a 100% reliable measure of clotting activity, and you shouldn't take it as such.

Your body has to dissolve the clots. Some people's bodies do it very quickly while others take much longer. If your body is taking longer, you're still going to have a high d-dimer, even if you're therapeutic on the meds. Don't equate being on meds to automatically having a lower d-dimer. They measure/affect different things.

Hang in there! If you're staying up nights stressing about it, definitely check in with your doc. The peace of mind is worth it.