The treated hypothyroidism in pregnancy without SIBO group showed significantly higher TSH and CRP (p = .021, p = .016), significantly lower TPOAb and neutrophils percentage (p < .001, p = .039), and no statistically significant difference in T4, WBC, and neutrophils (p = .667, p = .628, p = .467). This evidence concerns the gene CRP and hypothyroidism.