Abstract
Objective: This study was set up to investigate the relationship between immune process and high levels of human chorionic gonadotropin-β (βhCG) in hyperemesis patients with or without hyperthyroxinemia. Methods: βhCG, immune parameters and thyroid related hormones were assayed in hyperemesis patients and in controls. Results: Mean serum βhCG, fT<sub>4</sub> and TSH levels were significantly higher in hyperemesis patients than in controls (p < 0.01, p < 0.01, p < 0.05, respectively). Further, immune parameters regarding IgG, IgM, C<sub>3</sub>, C<sub>4</sub> and lymphocyte count were significantly higher in patients than in controls (p < 0.05, p < 0.01, p < 0.01, p < 0.05, p < 0.01, respectively). In hyperemesis patients with hyperthyroxinemia, mean serum βhCG, IgG and IgM were significantly higher than in hyperemesis women without hyperthyroxinemia (p < 0.001, p< 0.05, p < 0.05, respectively). βhCG was positively correlated with fT<sub>4</sub> (r = 0.45, p < 0.05), with lymphocyte count (r = 0.47, p < 0.01), with IgM (r = 0.38, p < 0.05) and with C<sub>3</sub> (r = 0.40, p < 0.05) in hyperemesis patients. A negative correlation between βhCG and TSH (r = –0.43, p < 0.05) was noted in the hyperemesis group. Free T<sub>4</sub> showed a positive association to IgM (r = 0.49, p < 0.01), to IgG (r = 0.40, p < 0.05), to lymphocyte count (r = 0.45, p < 0.05). Conclusion: Immunologic activity in pregnancy may have an effect or role on the stimulatory mechanism of βhCG in hyperemesis patients with or without hyperthyroxinemia.
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