In our research, we calculated the normal value of THAb: 0–4.45% (T3‐IgG), 0–4.62% (T3‐IgM), 0–3.98% (T4‐IgG), and 0–4.20% (T4‐IgM) and determined that the prevalence of THAb was 22.8% in HT and 45.6% in GD. This evidence concerns the gene CD40LG and hematocrit.