Word Count: 661 Date:
Discover What Is Involved In The IVF Process
In Vitro Fertilisation (IVF) literally means fertilisation in glass. Instead of sperm penetrating the egg within the body (in vivo), fertilisation takes place in a sterile disposable dish in a laboratory (In vitro).
Once the egg has been fertilised the resulting embryo is then transferred into the uterus with the hope of establishing a pregnancy. More than three million babies have been born using IVF and other assisted reproductive technologies (ART) since the worlds first IVF baby was born in July 1978.
Looking at the process in more detail, the first step is ovarian stimulation.The treatment at this stage relies upon fertility drugs to stimulate the development of follicles in the ovaries. Most of the fertility drugs used are given by subcutaneous injection and these injections carry on for approximately twelve days.
During the stimulation phase serial ultrasound scans are used to monitor the number and growth of ovarian follicles and the development of the lining of the uterus. The ovaries are stimulated to produce more eggs than in a normal cycle in order to improve the chances of achieving a pregnancy.
Egg collection is performed vaginally using a special needle guided by ultrasound. Each follicle is aspirated in turn until all the eggs are collected. The procedure is usually carried out under heavy sedation but sometimes a general anaesthetic is required.
After this the process moves to the laboratory where the sperm sample is assessed by an embryologist and a suitable method of preparation used to select the most active sperm for insemination. The eggs have their surrounding cells removed in preparation for the fertilisation process. The inseminated eggs are then placed in an incubator overnight and are checked the following morning to see how many have fertilised.
The fertilised eggs (embryos) are then cultured for between two and five days in the laboratory before being transferred into the uterus. The best one or two embryos are selected for transfer either two to three days after egg collection or cultured further until day 5 (Blastocyst transfer). Any other good quality embryos may be stored by freezing (cryopreservation) for possible transfer at a later date.
Sometimes, where the male partner has a low sperm count and/or poor motility or couples have experienced previous failure of fertilisation during IVF a procedure called Intracytoplasmic Sperm Injection (ICSI) is used. This involves the injection of a single live sperm directly into the centre of the egg using a very fine glass needle under a high power microscope. ICSI is a laboratory technique which helps fertilisation take place and is an extension of the IVF procedure.
In the UK all IVF clinics are regulated by the Human Fertilisation and Embryology Authority (HFEA). Figures produced by the HFEA reveal that approximately 24% of live births resulting from IVF and ICSI treatment are twins compared to less than 1% following natural conception.
Although the prospect of conceiving twins may be attractive to some couples having fertility treatment, the fact is that the risk of complications during a twin pregnancy is much higher with less chance of the babies being born healthy and developing normally.
Therefore, clinics are being encouraged to introduce an elective single embryo transfer (eSET) policy with the aim of reducing multiple pregnancy rates to levels recommended by the HFEA. Things to consider when implementing this policy include patient selection (younger patients with good quality embryos are best suited for eSET), selection of embryos for eSET and the day of embryo transfer.
There is evidence to show that it is now possible to transfer a single blastocyst on day 5 in patients who are keen to avoid a multiple pregnancy and still achieve success rates comparable to the transfer of two embryos on day 2-3. It will be interesting to see if this policy has any impact on overall success rates in the future.
Comments
como aplicar cytotec PPxYd1ms cytotec precio quito ZrcaPMV como funciona cytotec bUw7sR costo cytotec mexico Yd1m como tomar cytotec oral mhNBF776P donde comprar cytotec bUw7sR cytotec misoprostol QOIOdHhH cytotec chile WyELTbi cytotec en farmacias espana sRqhEZ cytotec para abortar mhNBF776P precio cytotec espana n3ZNYjuv81d como conseguir cytotec zWyELTbiPG cytotec en guatemala n3ZNYjuv81d cytotec necesita receta PPx misoprostol en argentina venta WyELTbi comprar misoprostol en montevideo ZrcaPMV comprar misoprostol en argentina eNUagz comprar misoprostol mexico Yd1m cytotec venezuela caracas Yd1m cytotec venezuela 2011 bUw7sR cytotec venta tenerife aGHc06V5r cytotec precio bogota mhNBF776P pastillas cytotec precio eNUagz cytotec precio peru qhEZiYm Como tomar cytotec misoprostol PPx Comprar cytotec en madrid PPxYd1ms cytotec precio bUw7sR precio cytotec misoprostol WyELTbi donde comprar cytotec en espana WyELTbi cytotec misoprostol ecuador bUw7sR cytotec indicaciones QOIOdHhH cytotec misoprostol cuanto cuesta mhNBF776P cytotec precio en chile qhEZiYm cytotec misoprostol pfizer PPxYd1ms cytotec se vende sin receta medica qCxeEl misoprostol comprar rosario PPx donde comprar cytotec espana n3ZNYjuv81d misoprostol cuanto cuesta PPyMk venta misoprostol peru zWyELTbiPG venta cytotec en espana PGbUw7 cytotec cuanto cuestan colombia WyELTbi cytotec venezuela comprar mhNBF776P cytotec venta pfizer bUw7sR cytotec venta serena n3ZNYjuv81d cytotec cuanto cuesta qhEZiYm cytotec venta en argentina zWyELTbiPG cytotec precio farmacias del ahorro zWyELTbiPG donde conseguir cytotec WyELTbi donde comprar cytotec misoprostol PPyMk generico cytotec PPyMkZrcaP donde comprar cytotec en espana PPyMkZrcaP cuanto cuesta cytotec sRqhEZ pastilla cytotec n3ZNYjuv81d cytotec generico funciona igual PPxYd1ms precio cytotec espana WyELTbi precio cytotec bogota aGHc06V5r venta cytotec mexico mhNBF776P pastilla abortiva cytotec QAPT9 misoprostol precio en argentina zWyELTbiPG cytotec venta pichincha PPxYd1ms cytotec farmacias del ahorro qhEZiYm precio misoprostol chile zWyELTbiPG comprar cytotec en caracas WyELTbi cytotec cuanto cuesta n3ZNYjuv81d donde comprar cytotec en venezuela QOIOdHhH cytotec informacion qCxeEl cytotec se vende en farmacias qhEZiYm venta cytotec manizales caldas PPyMk cytotec presentacion bUw7sR cytotec costo mexico ZrcaPMV venta cytotec chile qCxeEl cytotec venta en venezuela n3ZNYjuv81d venta misoprostol peru PPyMk cytotec comprar en bogota qCxeEl venta cytotec en bogota PPx misoprostol generico sirve para abortar n3ZNYjuv81d cytotec misoprostol espana PPyMkZrcaP precio cytotec en colombia PPyMkZrcaP comprar misoprostol argentina PPxYd1ms cytotec tiempo de efecto ZrcaPMV donde comprar cytotec en venezuela zWyELTbiPG cytotec misoprostol cuanto cuesta PPyMk cytotec precio bogota gratis n3ZNYjuv81d cytotec misoprostol precio peru PPyMkZrcaP misoprostol venta argentina QOIOdHhH cytotec preguntas eNUagz precio del cytotec PPyMk comprar misoprostol aborto mhNBF776P cytotec precio mercadolibre Yd1m donde comprar cytotec en madrid PGbUw7 medicina cytotec WyELTbi precio cytotec argentina qhEZiYm donde comprar cytotec en madrid PPyMk cytotec pfizer QOIOdHhH precio misoprostol espana QOIOdHhH misoprostol en argentina venta PPyMkZrcaP donde comprar misoprostol en mexico zWyELTbiPG cytotec venta quito ecuador zWyELTbiPG misoprostol generico precio PPx cytotec precio medellin ZrcaPMV cytotec precio bogota qCxeEl comprar cytotec en venezuela PPyMkZrcaP cytotec misoprostol pfizer bUw7sR cytotec requiere receta medica UqRiYmUqR cytotec misoprostol generico ZrcaPMV donde comprar cytotec en medellin bUw7sR cytotec venta uso QOIOdHhH precio cytotec colombia n3ZNYjuv81d cytotec comprar en bogota ZrcaPMV misotrol o cytotec mhNBF776P misoprostol comprar espana Yd1m venta cytotec alicante PPyMk cytotec venta pfizer eNUagz comprar misoprostol en mexico PPxYd1ms cytotec misoprostol vademecum n3ZNYjuv81d cytotec comprar espana PPx como conseguir cytotec ZrcaPMV sobre dosis cytotec PPxYd1ms cytotec en espana PPx cytotec barato eNUagz cytotec precio santiago QOIOdHhH donde comprar cytotec en costa rica qCxeEl misoprostol en argentina venta UqRiYmUqR cytotec misoprostol 200 mcg PGbUw7 misoprostol 200 mcg pastillas sRqhEZ cytotec farmacias similares UqRiYmUqR misoprostol precio en argentina WyELTbi cytotec en barcelona PPx comprar misoprostol chile mhNBF776P comprar cytotec en madrid WyELTbi misoprostol precio farmacias sRqhEZ cytotec venta pereira PPyMk donde comprar cytotec en peru QAPT9 cytotec tiempo de efecto Yd1m cytotec venta en peru 2011 ZrcaPMV cytotec misoprostol precio peru sRqhEZ misoprostol precio espana PPyMkZrcaP donde comprar cytotec en espana bUw7sR cytotec cuanto cuesta en mexico bUw7sR venta cytotec chile PPyMkZrcaP cytotec venta tepic zWyELTbiPG cytotec via oral dosis bUw7sR venta cytotec bUw7sR cytotec precio en espana zWyELTbiPG precio cytotec colombia QOIOdHhH cytotec pfizer qCxeEl cytotec precio en panama zWyELTbiPG cytotec venta san luis potosi WyELTbi precio misoprostol cytotec qCxeEl cytotec misoprostol qCxeEl comprar misoprostol medellin mhNBF776P
Add Comment