The Effects of Maternal Subclinical Hypothyroidism on Fetal Thymus Size: A Prospective Study.

: This study investigated the impact of maternal subclinical hypothyroidism on fetal thymus size and development and explored how inadequate thyroid hormone production in pregnant women affects the fetal thymus. : Conducted at the Giresun Obstetrics, Gynecology, and Pediatrics Training and Research Hospital, this case-control study involved 86 pregnant women, 43 with hypothyroidism and 43 without. Maternal thyroid function was assessed using TSH and free T4 levels, and fetal thymus size and thymus-thorax ratio were measured using ultrasound.