This way was in good agreement with more demanding procedures. Both urea and sodium chloride may be used as chaotropic agents. Reference values of avidity indices essential for interpretation of patients' results must be established individually for distinct assay conditions.

Introduction: the heterogeneity of anti-phospholipid antibodies can be manifested not only in different antigenic specificities, but also in their avidities. the aim of the study was to investigate the relationship between anti-cardiolipin antibody (acL) igG avidities and levels within the range of their titres, from very low to high ones. Material and methods: We analyzed 78 serum samples from 60 patients by eLiSa with chaotropic agents, using urea concentration of 6 and 8 mol/l and single diluted serum samples. the changes of acL levels and avidities were explored during a long-term follow-up in 14 patients. Results: the avidities of acLs did not differ in the groups of patients classified according to acL levels. the higher avidity antibodies predominated in our patients and the fluctuation of avidities in the longitudinal follow-up did not show significant differences. no relationship between acL levels and their avidities was found. Conclusions: acL avidities seem to have no relationship with acL levels and high-avidity acLs; the potentially deleterious effects might be present also in patients with low and extremely low acL levels. avidity of acLs belongs to stable characteristics with insignificant changes in time.

Aims. Antiphosphatidylethanolamine antibodies (aPE) represent one type of antiphospholipid antibody (aPL) directed against the neutral phospholipids − phosphatidylethanolamines. The aim of this study was to evaluate levels and avidities of aPE in several groups of patients and compare them with conventional aPLs. Methods. aPE were analysed in a cohort consisting of 68 hospitalized patients. The other cohort comprised 22 patients with immunologically-mediated diseases. The control group consisted of 20 healthy persons. ELISA methods were used for determination of aPL. Avidities of aPE were tested by modified ELISA with urea as a chaotropic agent. Results. aPE IgG/IgM were significantly higher in the group of patients with venous thromboembolism than those with non-thrombotic internal disorders (P=0.02 for both Ig classes). aPE IgG/IgM elevated above cut-off values were found in 10.8% of patients with venous thromboembolism and as a single aPL in 6.5%. Levels of aPE IgG higher than our limit (>6 U/mL) were detected in 29% of patients with immunologically-mediated diseases with other positive aPL. Low-, intermediate-and high-avidity aPE IgG were found in patients of both cohorts. The avidities of aPE IgG differed from those of anticardiolipin antibodies IgG. Neither aPE IgG levels nor avidity dynamics significantly changed during follow-up. Conclusion. aPE may be related to venous thromboembolism and may be part of the repertoire of aPL in immunologically-mediated diseases. There are patients with thrombosis negative for conventional aPL but positive for aPE. aPE IgG may have different avidities.