Families at risk are being identified
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DNA test for heart attack risk in families

25 January 2013 Last updated at 19:33 GMT

Doctors in Wales have pioneered the use of genetics to identify people at risk of early heart attacks.

Using DNA testing, they say they have been able to pinpoint an uncommon strain of hereditary heart disease - in both patients and their families.

There are now calls for it to be introduced in England.

Carwyn Jones reports.