Page last updated at 13:21 GMT, Thursday, 25 February 2010

Oral questions

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Patients are at risk of being prescribed overdoses because some hospital scales still show imperial measurements, a former president of the Royal Society of Medicine has warned.

At question time on 25 February 2010, Lord Walton of Detchant pointed to a survey showing the number of hospitals that had not fully converted to metric measurements.

He told peers: "The dosage of many powerful drugs is now calculated according to the weight in kilograms of the recipient and if in error such a calculation used imperial units there is a serious risk of either underdosage or, more importantly, overdosage."

He said the Local Authority Coordinator of Regulatory Services had carried out a survey which showed "30% of weighing machines in hospitals were switchable between metric and imperial units and a staggering 10% were switched to imperial units only".

Baroness Thornton, a junior health minister, said that the government was "issuing a new alert in March" following one last year.

"It is a very, very important issue we have to get right," she added.

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