Maternal thyroid ultrasound
The volume of the thyroid gland was in excess of the normal value of 18 ml in 19.2% of the women. Nodular goiter was diagnosed in 17 (5.4%). The mean thyroid volume of women with severe iodine deficiency was significantly larger than that in the group with adequate iodine intake, and the frequency of goiter was increased in all groups with iodine deficiency (Fig. 4).