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Easy Blood Test May Reveal Women's Heart Risk

White Blood Cell Count May Work When Other Tests for Heart Disease Fail
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March 14, 2005 - A woman's white blood cell count may not only be a sign of how healthy her immune system is, but it may also reveal her risk of heart disease when other tests fail, a new study suggests.

Researchers found that women with the highest white blood cell counts had twice the risk of dying of heart disease than those with the lowest levels, even after adjusting for other known risk factors such as high cholesterol, smoking, diabetes, being overweight, or high blood pressure.

White blood cells are cells that help the body fight infection and other diseases. The immune system typically releases more white blood cells in response to infection.

The results lend support to a growing body of evidence that suggests infection and the resulting inflammation it causes within the body play a critical role in heart disease and hardening of the arteries.

If further studies confirm this association between white blood cell count and heart disease risk, researchers say this inexpensive and widely available blood test may spot those at risk for a heart attack or stroke who are not identified by other risk factors.

White Blood Cells May Indicate Heart Health

In the study, which appears in the March 14 edition of Archives of Internal Medicine, researchers looked at data collected from more than 70,000 postmenopausal women who participated in the Women's Health Initiative Observational Study. All of the women were free of heart disease at the start of the study and were followed for an average of about six years.

The women's white blood cell counts were also measured at the start of the study, and researchers divided the women into four levels according to their initial white blood cell counts.

The results showed that women in the top fourth with the highest white blood cell counts were twice as likely to die of heart disease during the study period than those in the lowest fourth, after adjusting for other risk factors.

In addition, women in the top fourth also had a 40% higher risk of nonfatal heart attack, 46% higher risk of stroke, and 50% higher risk of death due to any cause.

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