A member asked:

How long can you have a dvt in calf before it causes a problem? is it true that it will not cause a pe if it's below the knee?

3 doctors weighed in across 2 answers
Dr. Dimitri Novitzky answered

Specializes in Thoracic Surgery

DVT: Calf DVT does not induce PE, however proximal extension will do from the distal femoral vein +- 30%. Complications from calf DVT, may occur at any time.

Answered 6/10/2015

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Dr. Joel Gotvald answered

Specializes in Vascular Surgery

Deep Venous Thrombus: Calf DVT can cause problems immediately, to include pain, swelling, inflammation & can also extend or embolize. It is NOT true that a below knee DVT cannot embolize. Any leg DVT can embolize to the lungs (PE), since it has a direct path to the lungs through the deep system. Below knee DVT should usually be treated with blood thinner drugs to minimize risk of extension & embolization (PE).

Answered 6/28/2015

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