U.S. doctors online nowAsk doctors free
Brookfield, WI
A 27-year-old male asked:

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

1 doctor answer1 doctor weighed in
Dr. Amanda Stream
Critical Care 17 years experience
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.
Created for people with ongoing healthcare needs but benefits everyone.
Last updated Feb 18, 2015


Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.