Reviewer’s report
Title: 
Analysis of basal serum TSH, FT3, and FT4 levels based on age, sampling
time in women with infertility
Version: 
1 
Date: 
14 Jul 2021
Reviewer's report:
1. In introduction, you should raise the importance of abnormal thyroid function
in infertility women. I totally agree that treatment of thyroid dysfunction
improves infertility treatment outcome tremendously but the recommendation of
universal screening for women undergo infertility treatment should base on the
prevalence of its in that population.
2. What is the rationale behind the time of the day study? Could you elaborate
this concept in Introduction. 
3. The sampling time is only limited to morning. What would make thyroid
function differ during that period of time? 
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Is the study design appropriate to answer the research question (including the use
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