Deep Vein Thrombosis (DVT) Calculator
This Blood Clot Calculator is what doctors use to initially determine the probability of a DVT. It is absolutely free and we wont ask for your email to see the results. Simply answer the 10 questions below.
Question 1 of 10
1. Did you recently get treatment for cancer (last 6 months) or are currently being treated for cancer?
Question 2 of 10
2. Have you experienced paralysis or partial loss of voluntary movement of your lower extremities? Or have you had a recent cast that left you unable to move your lower extremities?
Question 3 of 10
3. Have you been bedridden recently for more than 3 days, had major surgery within twelve weeks?
Question 4 of 10
4. Is your calf swelling more than 3 cm compared to the other leg?
Question 5 of 10
5. Is there a certain part of your calf/thigh/groin (deep venous system) that feels more tender than the rest of your leg?
Question 6 of 10
6. Is your entire leg swelling?
Question 7 of 10
7. When you apply pressure to the swollen area with your finger and then release it, does it cause an indentation that lasts for some time? (this is called a pitting edema)?
Question 8 of 10
8. Do you have visible surface veins that are not varicose?
Question 9 of 10
9. Have you had a blood clot in your leg before (prior DVT)?
Question 10 of 10
10. Is there an alternative cause for the symptoms you have that is considered at least as likely as a DVT?
This tool is designed for those asking "do I have a blood clot in my leg?" or "do I have a DVT?"
When someone is suspected of having a blood clot in their leg (DVT), a doctor will ask a set of questions to determine the liklihood of a DVT. These questions are known as the Wells Score or Wells Criteria for DVT. The above Blood Clot Calculator is based on the Wells Criteria.
The Wells Criteria was originally made by Doctor Phil Wells, Professor and Chair of the Department of Medicine at Ottawa Hospital in Ottawa, Canada.
It is important that this test is not the sole factor in determining a pulmonary embolism (PE) and/or a deep vein thrombosis (DVT). It should only be conducted after a history and physical examination suggests a PE/DVT.
In addition, a D-dimer blood test should not be conducted before a history and physical examination. A positive result from the D-dimer blood test does not guarantee a DVT/PE.
Also see the Pulmonary Embolism (PE) Calculator.