What's already known about this topic?
- Inhibin A levels are considerably higher in the second trimester maternal serum of smokers compared with nonsmokers.
What does this study add?
- This is the first study to compare the levels of inhibin A in the first trimester maternal serum of smokers and nonsmokers.
- Inhibin A levels are increased in the first trimester maternal serum of smokers, but to less of an extent than is found in the second trimester.
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