This Blood Clot Calculator is what doctors use to initially diagnose you to figure out what tests to do next. Use it yourself by clicking below.


Start Over

Disclaimer: The following test is provided as an information resource only and is not to be relied on or substituted for any professional diagnostic or treatment. If you beleive you have a blood clot, you must consult a doctor.

You can use this if you're asking yourself "do I have a blood clot in my lung?" or "do I have a Pulmonary Embolism?"

When someone is suspected to have a blood clot in their lung (PE), a doctor will ask a set of questions to determine the chance of a PE and what tests to perform next. These questions are based on the Wells Score for a PE, which is what this Blood Clot Calculator uses.

This test was originally made by Doctor Phil Wells, Professor and Chair Department of Medicine at Ottawa Hospital.

It's important that this test isn't the main factor in determining a pulmonary embolism (PE) and/or a deep vein thrombosis (DVT). It should only be conducted after a history and physical suggests a PE/DVT.

In addition, a D-dimer blood test shouldn't be conducted before a history and physical. A positive result from the D-dimer blood test doesn't guarantee a DVT/PE.

  1. "Original/Primary Reference: Wells PS, Anderson DR, Rodger M, Stiell I, Dreyer JF, Barnes D, Forgie M, Kovacs G, Ward J, Kovacs MJ. Excluding pulmonary embolism at the bedside without diagnostic imaging: management of patients with suspected pulmonary embolism presenting to the emergency department by using a simple clinical model and d-dimer. Ann Intern Med. 2001 Jul 17;135(2):98-107. PubMed PMID: 11453709.
  2. "Validation: Wolf SJ, McCubbin TR, Feldhaus KM, Faragher JP, Adcock DM. Prospective validation of Wells Criteria in the evaluation of patients with suspected pulmonary embolism. Ann Emerg Med. 2004 Nov;44(5):503-10. PubMed PMID: 15520710.
Start managing your Warfarin Register for Free