A new blood test can show whether patients with cardiovascular disease are taking their medication correctly, which could save lives according to researchers.

Up to 40 per cent of patients with cardiovascular diseases fail to take their medication correctly, which can lead to complications, hospital re-admissions and even death.

The new test, developed by researchers at De Montfort University in Leicester, can measure the amount of drugs in the body from just a single finger prick of blood. The test could be carried out in a clinic, pharmacy or even at home, with the sample then sent off to experts for analysis.

In 2007 there were around 251 million prescriptions for the treatment and prevention of cardiovascular diseases in England. If 40 per cent are not used this equates to £800 million in unused medication.

Sangeeta Tanna and Graham Lawson, medical docttors, are working with Kamlesh Khunti and Melanie Davies professors at the University Hospitals of Leicester NHS Trust and the University of Leicester to trial the test.

As part of the trial, the test is being used to monitor patients prescribed beta blockers and ace inhibitors, used to treat high blood pressure, and statins, which are prescribed to lower cholesterol levels.

Dr Tanna, who is leading the research at De Montfort University, said: “A drop of patient’s blood, from a simple finger prick, will be collected on a card.

“The sample can be collected in a clinic, a pharmacy or even at home as there is no need for any specialist training. Once the sample is dry, the card can then be posted to a laboratory for analysis.

“The results will indicate the types and levels of drugs in the patient’s blood and will help doctors make an informed clinical decision concerning the levels of prescribed medication.”

Cardiovascular disease, also known as heart or circulatory disease, covers disorders of the heart and blood vessels, namely hypertension, angina, heart attack, stroke and heart failure.