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The widely-held concept that levels of "good" cholesterol in the blood can indicate heart disease risk is not equally true for Blacks and whites, and the measure itself may be of less value than previously thought, according to a U.S. study published on Monday (November 21). Various types of cholesterol are thought to have either healthy or unhealthy effects. Low levels of so-called "good" high-density lipoprotein (HDL) cholesterol were linked with higher odds for developing cardiac problems in the long-term study - but only in white participants, the study published in the Journal of the American College of Cardiology found. In contradiction to what has generally been assumed, low HDL levels did not confer any higher risk of heart disease in Black people, researchers said. Among white people, however, those with HDL levels below 40 milligrams per deciliter had a 22% higher risk for coronary heart disease compared with those whose HDL levels were higher. High HDL levels (above 60 mg/dL), which are thought to be protective, were not linked with lower coronary heart disease risks in either race, researchers found.