Gestational age-specific normative values and determinants of serum progesterone through the first trimester of pregnancy.

Sci Rep · 2021 · PMC7893162 · PMID 33603122

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an increasing trendno p-value reported

Serum progesterone showed an increasing trend during the first trimester, with a transient decline between gestational weeks 6–8, corresponding to the luteal–placental shift.

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