According to various figures, for checking patients' risk of developing blood clots, a Kent NHS trust has been named among the UK's worst.

For thrombosis about 90 per cent of people have to be assessed according to new government rules by all hospitals.

But it was seen that about 16 per cent of people were checked for this by Dartford and Gravesham NHS Trust according to figures from the charity Lifeblood by end of 2010.

The national target was also not being hit by two other NHS Trusts in Kent.

Other NHS trusts like Maidstone and Tunbridge Wells NHS Trust and Medway NHS Trust also was reported to assess about 36 and 33 per cent patients, respectively, from October and December.

A warning came from Professor Beverley Hunt, who is the medical director at Lifeblood that lives of people can be put at risk if a clot is developed.

She said, "It can break off and travel round and block some or all of the blood supply to the lungs and if it blocks all the blood supply then obviously somebody would die."

It was stated by all the three NHS Trusts that attempts to make their figures on this better were on.