Maternal thyroid parameters
In 89 women with low urine iodine excretion or goiter, further thyroid tests were performed. The mean TSH was 1.11 6 0.54 mIU/l, which is within the normal range of 0.3±3.0 mIU/l. However, the FT3:FT4 ratio was remarkably increased at 0.45 6 0.13, and was above the upper limit of normal (0.25) in 97% of the women.