CD79A and gestational diabetes: The novelty of this study lies in (1) developing a nomogram integrating multiple factors such as demographic, immunity, lipid metabolism, hormone level and thyroid function to establish a GDM predictive model in early pregnancy, in particular, the introduction of the percentage of B lymphocytes and the level of IgA into the prediction model has not been reported before; (2) the nomogram demonstrated favorable discrimination and clinical usability for predicting the probability of GDM.