Abstract
Human in vitro fertilization is characterized by a low efficiency of implantation. Possible mechanisms for pregnancy loss are discussed. Embryo viability or quality, abnormal implantation, and delayed or absent corpus luteum rescue may all play a role in pregnancy wastage. Defining the possible mechanism for these losses may allow hormonal treatment to correct specific abnormalities.
MeSH terms
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Abortion, Spontaneous / physiopathology*
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Chorionic Gonadotropin / blood
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Corpus Luteum / metabolism
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Embryo Implantation / physiology*
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Embryo Transfer / economics*
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Embryo Transfer / statistics & numerical data
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Estradiol / blood
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Female
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Fertilization in Vitro*
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Humans
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Pregnancy
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Pregnancy Trimester, First / physiology
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Progesterone / blood
Substances
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Chorionic Gonadotropin
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Progesterone
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Estradiol