The measurements showed that among four cases (1.16%) with 1% or more methemoglobin, there was one case of stillbirth during the 30th week of pregnancy, which was statistically significant (P = 0.0116) with respect to the incidence of stillbirth among pregnant women with the concentrations of methemoglobin lower than 1%. The gene discussed is HBG2; the disease is Stillbirth.