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New Blood Test Advised for Diabetes Patients

A relatively new blood test for people with diabetes can predict their risk of developing heart disease, U.S. researchers reported on Monday.

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Two separate studies suggest that people with both type 1 and type 2 diabetes should regularly take the hemoglobin A1c test, on top of their regular checks of blood sugar. The HA1c test looks for glycated hemoglobin, also called glycosylated hemoglobin, and is a measure of how well blood sugar is controlled.

In one study, Dr. Sherita Golden and colleagues at Johns Hopkins University in Baltimore reanalyzed the data from 13 studies involving nearly 10,000 people from North America and Europe and found those with higher levels had much higher risks of heart and artery disease.

Writing in the Annals of Internal Medicine, they said a 1 percentage point increase in HA1c predicted an 18 percent increase in risk for total cardiovascular disease and a 28 percent risk for peripheral vascular disease -- clogged arteries in the legs, for instance. Although diabetes is known to double the risk of heart disease death, Golden said the specific relationship was unclear. "As a result, many people living with diabetes monitor their health for well-known risk factors for heart disease, such as obesity, cholesterol levels and blood pressure -- but, the big unknown has been the role of blood sugar levels in managing their risk of developing cardiovascular disease," she said in a statement. A second study found similar results.

Dr. Kay-Tee Khaw of Cambridge University and colleagues at Britain?s Medical Research Council studied 10,030 people aged 45 to 79 for six years.

They found a 21 percent increase in cardiovascular "events" such as heart attack, for every 1 percentage point increase in hemoglobin A1c above 5 percent.

"Persons with HA1c concentrations less than 5 percent had the lowest rates of cardiovascular disease and mortality," they wrote.

This was true even when patients were older and fatter and regardless of blood pressure or cholesterol levels.

The two studies "clearly prove that the glycosylated hemoglobin level is an independent progressive risk factor for incident cardiovascular events, regardless of diabetes status" Dr. Hertzel Gerstein of McMaster University in Ontario, Canada wrote in a commentary. "Glycosylated hemoglobin level can now be added to the list of other clearly established indicators of cardiovascular risk, such as blood pressure and cholesterol level," added Gerstein, a diabetes expert.