F5

Disease riskBlood clotsStrong evidenceHigh attention

3 to 8× more likely to develop dangerous blood clots.

The Factor V Leiden variant makes blood more prone to clotting. Day-to-day risk stays low, but it climbs around surgery, long flights, pregnancy and some birth-control methods, so it is worth flagging to any clinician.

Also known as: Factor V Leiden

Associated with

  • blood clot
  • thrombosis
  • DVT
  • pulmonary embolism
  • clotting

Educational only. Significant findings should be reviewed with a clinician.

Educational reference only — not a diagnosis. Discuss significant findings with a clinician.