Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Progesterone (P4) concentrations of the three groups of surrogates (term-delivered, aborted, and implantation failure) at the time of embryo transfer (ET). The levels of P4 were 1.99 ± 0.17 ng/mL, 4.04 ± 0.17 ng/mL, and 4.73 ± 0.04 ng/mL for the three groups, respectively. The full-term delivery group had a significantly lower P4 concentration compared to that of the other two groups.
