In patients with GDM, glucose homeostasis and insulin resistance parameters were higher than in patients from the control group (fasting glucose level (p < 0.0001), insulin level (p = 0.005), C peptide level (p = 0.01), HbA1c (p < 0.0001), IR HOMA (p = 0.0004)). The gene discussed is INS; the disease is Insulin resistance.