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In a survey of the North American embryo transfer industry, embryo transfer success rates from direct transfer of embryos were as good as to those achieved with glycerol. [58] Moreover, in 2011, more than 95% of frozen-thawed embryos were transferred by Direct Transfer. [59]
Dr. Christopher Chen of Singapore reported the world's first pregnancy in 1986 using previously frozen oocytes. [2] This report stood alone for several years followed by studies reporting success rates using frozen eggs to be much lower than those of traditional in vitro fertilization (IVF) techniques using fresh
In current state of the art, early embryos having undergone cryopreservation implant at the same rate as equivalent fresh counterparts. [2] The outcome from using cryopreserved embryos has uniformly been positive with no increase in birth defects or development abnormalities, [3] [8] also between fresh versus frozen eggs used for intracytoplasmic sperm injection (ICSI). [9]
While frozen embryos can be safely stored for 10 years or more, according to Johns Hopkins Medicine, Ahmad notes that, “Technically, if embryos are frozen and stored properly, there is no ...
The SART summarised 2008–9 success rates for US clinics for fresh embryo cycles that did not involve donor eggs and gave live birth rates by the age of the prospective mother, with a peak at 41.3% per cycle started and 47.3% per embryo transfer for patients under 35 years of age.
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The 1 °C / minute rate can be achieved by using devices such as a rate-controlled freezer or a benchtop portable freezing container. [22] Several independent studies have provided evidence that frozen embryos stored using slow-freezing techniques may in some ways be 'better' than fresh in IVF.