Although numerous studies concern fibrinogen (FBG) associations, the relationship between platelet (PLT) count and FBG plasma levels has yet to be completely investigated. The present study concerns the association between FBG plasma levels and PLT count in 5891 patients (2831 men and 3060 women) attending our outpatients' laboratory. Of these, a subgroup of 4116 patients (1899 men and 2217 women) with normal values of the parameters investigated was selected. A group of 170 patients with coronary heart disease was also included. The parameters studied were FBG, PLT count, leukocyte count and age. Our results showed that, in the outpatient population, FBG was significantly correlated with the PLT count (P < 0.000001) and, as previously reported, with the leukocyte count and age. In the patients with coronary heart disease, there was a significant correlation between FBG and PLT count (P < 0.000001), to be considered very significant considering the limited number of patients, whereas no correlation with age or leukocyte count was found. The role of interleukin-6, both in FBG and PLT production, is well known and may explain the correlation between these two parameters. The association of FBG and PLT count has yet to be fully investigated in epidemiological studies, even though they play an important role as two of the major contributors to the pathogenesis and evolution of cardiovascular diseases.
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