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Background: Multiple acute phase proteins and atherosclerotic risk factors increase the aggregability of erythrocytes. Methods and results: We used a simple slide test and image analysis to determine the degree of erythrocyte adhesiveness/aggregation in the peripheral blood of 222 women and 221 men with no, one, two or more atherosclerotic risk factors. The degree of erythrocyte adhesiveness/aggregation correlated significantly with the concentration of commonly used variables of the acute phase response. We also showed that individuals with low erythrocyte adhesiveness/aggregation tend to be younger and to have fewer risk factors for atherosclerosis, including diabetes mellitus, hypertension, hyperlipidemia and smoking. Conclusions: The association between increased erythrocyte adhesiveness/aggregation, higher concentrations of acute phase proteins, and increased atherosclerotic risk factors points to a possible clinical applicability of the erythrocyte adhesiveness/aggregation test (EAAT) to reveal the presence of both low-grade subclinical smoldering inflammation and morbid biology in individuals with risk factors for atherosclerosis. [Copyright &y& Elsevier]