DVT poses a threat to some airline travellers. In the UK, DVT used to be called economy (or coach) class syndrome, but this is very much a misnomer. DVT can happen to any one of us, whatever our style of air travel.

It is now possible to take a blood test to determine your vulnerability for blood to clot.

This test examines the number, type, form of your red and white blood cells, platelets and includes the genetic (inherited) tests including Factor V Leiden. It is estimated that 2 million people in the UK alone are at risk through the Leiden V Factor.

By identifying travellers who are predisposed to thrombosis they can be given pre-travel advice or treatment in order to reduce the risks of clot formation and it's consequences.