What disorder that the blood clots poorly*Factor V Leiden and prothrombin gene mutation (G20210A) are the most commonly identified genetic defects that increase a person’s risk for blood clotting. **Additional lab tests, such as measurement of free (active) and total protein S antigen levels, may be required in order to validate protein S activity assay results.

What Diseases Are Caused By Blood Clots?
Scientists have found the trigger of rare blood clots linked with COVID-19 vaccines. Scientists have found a possible trigger behind the extremely rare blood clots linked to AstraZeneca and Johnson & Johnson COVID-19 vaccines, an advance that may help design new and improved preventives against the viral disease.
What Blood Disorders Cause Clotting?
Thrombotic thrombocytopenic purpura: A rare blood disorder causing small blood clots to form in blood vessels throughout the body; platelets are used up in the process, causing a low platelet count.