Misjudging early embryo mortality in natural human reproduction
نویسندگان
چکیده
منابع مشابه
Early embryo mortality in natural human reproduction: What the data say
How many human embryos die between fertilisation and birth under natural conditions? It is widely accepted that natural human embryo mortality is high, particularly during the first weeks after fertilisation, with total prenatal losses of 70% and higher frequently claimed. However, the first external sign of pregnancy occurs two weeks after fertilisation with a missed menstrual period, and esta...
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Natural human embryonic mortality is generally considered to be high. Values of 70% and higher are widely cited. However, it is difficult to determine accurately owing to an absence of direct data quantifying embryo loss between fertilisation and implantation. The best available data for quantifying pregnancy loss come from three published prospective studies (Wilcox, Zinaman and Wang) with dai...
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2Fertility Clinic, Vilnius, Lithuania Human leukocyte antigen G (HLA-G) is a non-classical HLA class I molecule which can be expressed in the membrane-bound or soluble form and is well known for its tolerogenic properties. Increasing interest is now being addressed to the soluble forms, because they might have prognostic properties in the implantation and pregnancy process. The aim of our study...
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Harris begins his provocative paper in this way: I make two appeals to consistency, or to “parity of reasoning,” that I believe show that no one who either has used or intends to use sexual reproduction as their means of procreation, nor indeed anyone who has unprotected heterosexual intercourse, nor anyone who finds in vitro fertilization (IVF) acceptable, nor anyone who believes that abortion...
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In order to evaluate the niche of extended embryo culture in an IVF programme, retrospective analysis of non-selected IVF patients, who underwent ovarian stimulation from April 1998 to June 1999 in a single private practice assisted reproductive technology centre, was performed. Embryos were cultured for 48 h in S1/G1.2 medium followed by 48 to 72 h of culture in S2/G2.2 to day 5 or day 6. Only...
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ژورنال
عنوان ژورنال: F1000Research
سال: 2020
ISSN: 2046-1402
DOI: 10.12688/f1000research.22655.1