200
Participants
Start Date
June 1, 2025
Primary Completion Date
April 30, 2027
Study Completion Date
May 31, 2027
Levothyroxin
Levothyroxin 50ug/d from randomization until delivery
Placebo
Placebo to levothyroxin
Zhejiang Women's Hospital, Hangzhou
Zhejiang People's Hospital, Hangzhou
Zhejiang Provincial People's Hospital
OTHER
Women's Hospital School Of Medicine Zhejiang University
OTHER