If I have Crohn's disease and polycythemia rubra vera is a negative venous us and d dimer good enough to rule out a clot? Have leg swelling lower leg

Nearly. The gold standard to definitively rule out an deep vein clot is venography. However, this is rarely if ever necessary given that compression ultrasonography has a sensitivity and specificity each of around 95% compared to venography. I would recommend further evaluation if you have had an injury in that leg or a previous DVT. Otherwise it is unlikely that you have a thrombus with a negative US.

Related Questions

Polycythemia vera verified by second opinion. + Crohn’s. Unilateral calf swelling. Unilateral superficial vein. D-dimer + US normal. Get venogram?

Hard to know. The correct answer would depend upon your Wells score or some other method of predicitng the pre test probability of DVT. If one were to assume that this is a high pretest scenario then venogram would be the most appropriate next step. IF this would be considered a moderate risk scneario than a repeate US in several days time would be warrented. Read more...
Difficult to know. Polycythemia vera and Chrons are both risk factors for DVT . Also your sign and symptoms are suspicious for DVT. Venous Doppler US for a single exam may miss small DVT especially in the calf. D dimer if normal pretty sensitive. Many options repeat: Ultrasound and possibly d dimer, venogram [but these are not done much now], follow closely. Recommend close follow up with your doctor/ vein expert. Read more...

Feel pulse in 7 places between foot + leg. Unilateral swelling posteriorly. US + ABI normal. Have P. Vera + Crohn's. Time for arteriogram + venogram?

Feeling pulse. Feeling pulse in itself is not a bad thing. However the swelling needs to be examined to determine next course of action. Need not necessarily be arteriogram/venogram. The swelling may be nonvascular in nature. Read more...

A friend just told me that Crohn's can cause swelling from gastrocnemius to ankle. Is this true? Should I ask my doc for an autoimmune suppressant?

Yes. Yes. And the swelling, if it occurs (and is not an infection, strained muscle or other cause) can be caused by a clot that forms in the blood vessels in that part of the leg. This can be serious and mandates immediate attention. As far as immunosuppressants go, I don't think they would play a role in preventing any clots from forming. Your chances for a clot are over two times that of others. Read more...
Not correct. Your friend is not correct. Have the leg evaluated and make certain you are not dealing with phlebitis. Read more...