Endometrial infusion of human chorionic gonadotropin at the time of blastocyst embryo transfer (ET) does not improve clinical outcomes

      Blastocyst production of hCG has been posited to play a role in facilitating implantation. A recent study found that 500 IU of hCG augmented this process resulting in increased implantation rates of cleavage-stage embryos. No data are available to determine whether intrauterine hCG infusion improves sustained implantation rates (SIR) after blastocyst ET.
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