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Topic: Blastocyst

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	Blastocyst Embryo Transfer in IVF
		Candidates for blastocyst transfer are patients with at least six embryos and under the age of 40.
		The possible disadvantages of blastocyst transfer include a longer time interval between retrieval and transfer, fewer embryos that can be frozen, and the potential for lack of transfer due to degeneration and arrest of the embryos prior to the blastocyst stage.
		The decision to perform blastocyst culture and transfer is based on several factors including patient age, egg age in cases of donor egg, the number of eggs retrieved, previous IVF success, and perhaps most importantly, the embryo grade and cell count on day three of culture.
	www.evms.edu /jonesinstitute.org/blastocyst-transfer.html (664 words)

	Genetics & IVF Institute
		Until recently, culture of embryos, in the laboratory, to the blastocyst stage was very difficult because the several culture media that were used to supply nutrients to the embryos were inadequate for extended embryo growth in the laboratory.
		Blastocyst transfer may become the routine method of embryo transfer or it may be limited to selected subgroups of patients.
		The preparations for blastocyst culture are somewhat different for the laboratory and the transfer usually takes place on day 5 rather than day 3, so it is recommended that a discussion take place with your physician prior to your retrieval in order to decide if blastocyst transfer is right for you.
	www.givf.com /fertility/blastocyst.cfm (1282 words)

	Blastocyst transfer offered in St. Louis Missouri (Site not responding. Last check: 2007-11-06)
		The blastocyst culture conditions do not improve the health or viability of an individual embryo which is not otherwise able to develop for 5 days in vitro and then implant; rather it allows embryos capable of sustained growth to continue in culture and reach their maximum inherent capability.
		Blastocyst transfer may be of particular benefit for patients who develop many good quality embryos and want to limit their risk of a multiple pregnancy by transferring fewer embryos with higher potential for implantation.
		The decision to perform blastocyst culture and transfer is based on several factors including patient age, the number of eggs retrieved, previous IVF success, and perhaps most important, the embryo grade and cell count on day 2 of culture.
	www.ivfctrstl.org /ht-blastocyst.htm (2105 words)

	Blastocyst - Wikipedia, the free encyclopedia
		The blastocyst is the structure formed in early mammalian embryogenesis, after the formation of the blastocele, but before implantation.
		The blastocyst is formed of pluripotent cells and go on to form the developing embryo.
		The outside layer of cells of the blastocyst goes on to form the placenta, and the inner ball of cells forms the embryo.
	en.wikipedia.org /wiki/Blastocyst (191 words)

	Mammalian embryogenesis - Wikipedia, the free encyclopedia
		Blastocyst with an inner cell mass and trophoblast.
		The blastocyst is characterized by a group of cells, called the inner cell mass (also called embryoblast) and the mentioned trophoblast (the outer cells).
		The blastocyst can be thought of as a ball of a (mostly single) layer of trophoblast cells,with the inner cell mass attached to this ball's inner wall.
	en.wikipedia.org /wiki/Mammalian_embryogenesis (803 words)

	Blastocyst transfer reduces multiple births (Site not responding. Last check: 2007-11-06)
		Blastocyst culture and transfer is a new important technique developed for in vitro fertilization (IVF) that maximizes pregnancy rates while minimizing the risk of multiple pregnancy.
		The ability to grow embryos for five days to the blastocyst stage of development in the laboratory, rather than the traditional three days, allows clinicians to determine with greater certainty which embryos are really the "best" in terms of their potential for implantation.
		Consequently, blastocyst culture makes it possible to select the best one or two blastocysts vs. three or four early embryos to transfer back to the mother.
	www.fertilitynetwork.com /articles/articles-blastocyst.htm (953 words)

	Blastocyst Transfer (Site not responding. Last check: 2007-11-06)
		Blastocyst transfer is becoming more and more popular in North American fertility clinics, and may help you to increase your chances of IVF success.
		Blastocyst transfer is a type of embryo transfer procedure used during IVF.
		This is because the blastocyst embryo is implanted into the uterus at almost the same time that it would have entered the uterus should the pregnancy have been a natural one.
	www.sharedjourney.com /articles/blast.html (961 words)

	IVF - IVF Blastocyst Formation and Blastocyst Transfer
		A blastocyst is an embryo created during in vitro fertilization that has been grown in the laboratory for five to six days.
		In order to enable the embryos to reach the blastocyst stage, the culture dishes containing the embryos and the media are maintained in an incubator where the atmosphere, humidity, and temperature are carefully monitored and controlled.
		By definition, a blastocyst is an embryo that has divided into hundreds of cells and is composed of two parts.
	www.ivf1.com /IVF-Embryo-Culture-and-Blastocyst-Transfer (673 words)

	Blastocyst Transfer
		Blastocyst transfer is an assisted reproductive technology developed to aid in the selection of high quality embryos during in vitro fertilization (IVF).
		Blastocyst transfers are not appropriate for all patients undergoing IVF.
		Women who fall into these categories are encouraged to have their embryos transferred after the usual three days of development because blastocysts do not respond to embryo freezing as well as earlier stage embryos.
	www.bostonivf.com /undergoing_treatment/blastocyst_transfer.cfm (293 words)

	UNSW Embryology- Week 2 Blastocyst Implantation
		The blastocyst then moves moves into the endometrium, initially partially buried, and on completion of implantation, is fully buried in the endometrium.
		Blastocyst implantation depends on maternal expression of leukaemia inhibitory factor.
		A critical point during mammalian pregnancy is the implantation of the blastocyst when the embryo attaches to the wall of the uterus.
	embryology.med.unsw.edu.au /Notes/week2_3.htm (767 words)

	CTfertility.com \| IVF \| Blastocyst Transfer (via CobWeb/3.1 planet03.csc.ncsu.edu) (Site not responding. Last check: 2007-11-06)
		Connecticut Fertility Associates offers blastocyst transfer, which is a new technique developed to maximize pregnancy rates while minimizing the risk of a multiple births.
		The embryos (called blastocysts) that survive to this stage of development are usually strong and healthy.
		Blastocyst culture and transfer allows clinicians to determine, with greater certainty, which two or three embryos are the best ones to transfer back to the mother, for the most likely potential for implantation.
	www.connecticutfertility.com.cob-web.org:8888 /education/blastocyst_transfer.html (161 words)

	Blastocyst Culture and Transfer; ART Program - Sharp HealthCare in San Diego (Site not responding. Last check: 2007-11-06)
		The blastocyst growth, indicated by total cell numbers, and the balance between the differentiating cell types is controlled by a variety of factors that affect cell fate.
		Clinical success with the blastocyst culture and transfer depends on the understanding of various factors, which affect the development of early-stage embryos to the blastocyst stage, and the paternal and maternal influence on blastocyst implantation and post-implantation events.
		Ratio of inner cell mass and trophoblastic cells in blastocysts derived from porcine 4- and 8-cell embryos and isolated blastomeres cultured in vitro in the presence or absence of protein and human leukemia inhibiting factor.
	www.sharp.com /services/index.cfm?id=599 (1718 words)

	RSC Bay Area - Blastocyst Embryo Transfer
		Experience and confidence in blastocyst transfer is also critical for patients who want to limit their risk of multiple pregnancy by transferring only one embryo, yet maintaining the highest pregnancy rate possible.
		A possible risk with attempting a blastocyst transfer is that none of the embryos may develop to the blastocyst stage (an average of 40% of fertilized eggs develop to the blastocyst stage); therefore, there would be no embryos to transfer.
		Blastocysts of good quality can be frozen on day 5 or day 6 for future use in a frozen embryo transfer cycle.
	www.rscbayarea.com /articles/blastocyst_transfer.html (751 words)

	Fertility Library - Blastocyst Transfer
		A blastocyst is an embryo at an advanced stage of physiologic development when there are two cell types present: one group of cells that form the placenta, and another group of cells that form the fetus.
		A blastocyst is a highly differentiated, highly developed embryo that has grown to the point where it is ready to attach to the uterine wall (implantation).
		A second reason for the increased implantation rate of the blastocyst is that the blastocyst is the stage of embryonic development that should reside in the uterus at implantation.
	www.sdfertility.com /blastocyst.htm (1657 words)

	Blastocyst Culture and Transfer - MSH Fertility Centre at Mount Sinai Hospital, Toronto (via CobWeb/3.1 ... (Site not responding. Last check: 2007-11-06)
		A blastocyst is an embryo that has developed to the 128 cell stage, about the fifth day of development.
		Blastocysts freeze well and when thawed must be transferred into the mother's uterus within a couple of hours.
		Hormones from the blastocyst (human chorionic gonadatrophins) enter the mother's bloodstream and can now be detected in a serum pregnancy test.
	www.mtsinai.on.ca.cob-web.org:8888 /reproductivebiology/Programs/blastocyst.htm (483 words)

	IN VITRO FERTILIZATION AND EMBRYO TRANSFER
		A blastocyst is a highly developed embryo that has divided many times to a point where it is nearly ready to implant on the walls of the uterus.
		A side benefit of a blastocyst transfer is the fact that the ability to generate a blastocyst provides important information about the likelihood of pregnancy.
		Additionally, because blastocysts have higher implantation rates, it is possible for a couple to go through IVF once and have enough blastocysts for the current cycle as well as any future cycles.
	www.ivf.com /blastocyst.html (1633 words)

	Blastocyst Transfer in IVF for Infertility
		Blastocysts are embryos that have been cultured to day 5-6 and have divided into many cells and two distinct cell types.
		Blastocysts are heartier, have a higher implantation rate, and are more likely to survive.
		Blastocysts cannot be used in all IVF cycles.
	www.mcfivf.com /blastocyst.html (211 words)

	ivf-infertility.com \| Blastocyst embryo transfer
		Blastocyst transfer is claimed to be more physiological than pronucleate or cleaved-embryo transfer is as it mimics nature more closely.
		The rational behind a blastocyst transfer is that an embryo which has failed to reach the blastocyst stage, would be unlikely to have resulted in a pregnancy.
		Blastocyst embryo transfer into the uterine cavity is performed about 5-6 days after egg collection.
	www.ivf-infertility.com /ivf/blastocysts.php (438 words)

	Cleavage and Blastocyst Formation
		The blastocyst stage is also a landmark in that this is the first time that two distinctive tissues are present.
		A blastocyst is composed of a hollow sphere of trophoblast cells, inside of which is a small cluster of cells called the inner cell mass.
		In the expanded blastocyst shown here, the inner cell mass is the dense-looking area at the botton of the embryo.
	arbl.cvmbs.colostate.edu /hbooks/pathphys/reprod/fert/cleavage.html (734 words)

	Blastocyst Culturing and Embryo Co-Culturing - Questions Answered by UCSF Center for Reproductive Health - Infertility ...
		Blastocyst culturing is a technique to grow embryos beyond the 3 rd day of culture.
		In certain patients, the advantage of blastocyst culturing is to allow optimal selection of embryos for transfer resulting in an increased implantation rate per embryo transferred.
		With blastocyst culturing, we are not able to freeze as many embryos because of poor embryo development to the blastocyst stage.
	www.ucsfivf.org /ucsf-ivf2.htm (1168 words)

	Blastocyst Transfer in IVF. Improved Success Rates.
		A blastocyst is an embryo that has developed in culture for at least five days after fertilization and has divided into two different cell types.
		A healthy blastocyst should hatch from its shell (zona pellucida) by the end of six days or earlier and begin to implant within the lining of the uterus.
		Usually, two blastocyst stage embryos are transferred, compared to four or five day-3 embryos.
	www.infertilityspecialist.com /blastocyst_ivf_infertility.html (422 words)

	Blastocyst Development (Site not responding. Last check: 2007-11-06)
		The blastocyst enters the uterus and begins to implant in the blood rich lining of the uterus.
		Through the action of hormones produced by the blastocyst, an intensive chemical exchange occurs between the blastocyst and the mother's tissue to signal its presence in the uterus.
		During the second week after conception, the inner cell mass of the blastocyst structure separates into three distinct layers that may be seen under a microscope.
	departments.weber.edu /chfam/Prenatal/blastocyst.html (247 words)

	IVF In Vitro Fertilization
		A blastocyst is an embryo, which has developed two cell types, 1) surface cells termed the trophectoderm, which will become the placenta and 2) the inner cell mass that will become the fetus.
		A healthy blastocyst should hatch from its shell (zona pellucida) by the end of six days, or earlier, and implant within the endometrium.
		The benefit of a day five transfer is that it allows the embryologist to watch the embryo for a longer period and more realistically assess it's quality.
	www.northshorefertility.com /ivf_blastocyst.html (342 words)

	Morhological Scoring of Human Embryos and It's Relevance to Blastocyst Transfer
		By determining how the quality of blastocysts formed on day-five/six during extended culture is related to their morphology as previously assessed on day-three, it is possible to use blastocyst formation as a measure of potential viability.
		In actuality, 471 blastocysts were ultimately used on day-five/six, with 234 being transferred (average per ET 2.3), and 237 being frozen (equivalent to 37% utilization).
		Simple observation of blastocyst formation or hatching does not provide the full picture that may be drawn from study of "spare embryos", because the extra dimension of rate of development may improve understanding of the impact of embryo origin on outcome.
	www.ivf.com /morphology.html (2273 words)

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