Assisted reproductive technology

Assisted reproductive technology (ART) includes medical procedures used primarily to address infertility. This subject involves procedures such as in vitro fertilization, intracytoplasmic sperm injection (ICSI), cryopreservation of gametes or embryos, and/or the use of fertility medication. When used to address infertility, ART may also be referred to as fertility treatment. ART mainly belongs to the field of reproductive endocrinology and infertility. Some forms of ART may be used with regard to fertile couples for genetic purpose (see preimplantation genetic diagnosis). ART may also be used in surrogacy arrangements, although not all surrogacy arrangements involve ART.

Assisted reproductive technology
Illustration depicting intracytoplasmic sperm injection (ICSI), an example of assisted reproductive technology.



With ART, the process of sexual intercourse is bypassed and fertilization of the oocytes occurs in the laboratory environment (i.e., in vitro fertilization).

In the US, the Centers for Disease Control and Prevention (CDC)—which —defines ART to include "all fertility treatments in which both eggs and sperm are handled. In general, ART procedures involve surgically removing eggs from a woman's ovaries, combining them with sperm in the laboratory, and returning them to the woman's body or donating them to another woman." According to CDC, "they do not include treatments in which only sperm are handled (i.e., intrauterine—or artificial—insemination) or procedures in which a woman takes medicine only to stimulate egg production without the intention of having eggs retrieved."[1]

In Europe, ART also excludes artificial insemination and includes only procedures where oocytes are handled.[2][3]

The WHO, or World Health Organization, also defines ART this way.[4]

Ovulation induction

Ovulation induction is usually used in the sense of stimulation of the development of ovarian follicles[5][6][7] by fertility medication to reverse anovulation or oligoovulation.

In vitro fertilization

Steps of IVF Treatment

In vitro fertilization is the technique of letting fertilization of the male and female gametes (sperm and egg) occur outside the female body.

Techniques usually used in in vitro fertilization include:

  • Transvaginal ovum retrieval (OVR) is the process whereby a small needle is inserted through the back of the vagina and guided via ultrasound into the ovarian follicles to collect the fluid that contains the eggs.
  • Embryo transfer is the step in the process whereby one or several embryos are placed into the uterus of the female with the intent to establish a pregnancy.

Less commonly used techniques in in vitro fertilization are:

  • Assisted zona hatching (AZH) is performed shortly before the embryo is transferred to the uterus. A small opening is made in the outer layer surrounding the egg in order to help the embryo hatch out and aid in the implantation process of the growing embryo.
  • Intracytoplasmic sperm injection (ICSI)
    Intracytoplasmic sperm injection (ICSI) is beneficial in the case of male factor infertility where sperm counts are very low or failed fertilization occurred with previous IVF attempt(s). The ICSI procedure involves a single sperm carefully injected into the center of an egg using a microneedle. With ICSI, only one sperm per egg is needed. Without ICSI, you need between 50,000 and 100,000. This method is also sometimes employed when donor sperm is used.
  • Autologous endometrial coculture is a possible treatment for patients who have failed previous IVF attempts or who have poor embryo quality. The patient's fertilized eggs are placed on top of a layer of cells from the patient's own uterine lining, creating a more natural environment for embryo development.
  • In zygote intrafallopian transfer (ZIFT), egg cells are removed from the woman's ovaries and fertilized in the laboratory; the resulting zygote is then placed into the fallopian tube.
  • Cytoplasmic transfer is the technique in which the contents of a fertile egg from a donor are injected into the infertile egg of the patient along with the sperm.
  • Egg donors are resources for women with no eggs due to surgery, chemotherapy, or genetic causes; or with poor egg quality, previously unsuccessful IVF cycles or advanced maternal age. In the egg donor process, eggs are retrieved from a donor's ovaries, fertilized in the laboratory with the sperm from the recipient's partner, and the resulting healthy embryos are returned to the recipient's uterus.
  • Sperm donation may provide the source for the sperm used in IVF procedures where the male partner produces no sperm or has an inheritable disease, or where the woman being treated has no male partner.
  • Preimplantation genetic diagnosis (PGD) involves the use of genetic screening mechanisms such as fluorescent in-situ hybridization (FISH) or comparative genomic hybridization (CGH) to help identify genetically abnormal embryos and improve healthy outcomes.
  • Embryo splitting can be used for twinning to increase the number of available embryos.[8]

Pre-implantation genetic diagnosis

A pre-implantation genetic diagnosis procedure may be conducted on embryos prior to implantation (as a form of embryo profiling), and sometimes even of oocytes prior to fertilization. PGD is considered in a similar fashion to prenatal diagnosis. PGD is an adjunct to ART procedures, and requires in vitro fertilization to obtain oocytes or embryos for evaluation. Embryos are generally obtained through blastomere or blastocyst biopsy. The latter technique has proved to be less deleterious for the embryo, therefore it is advisable to perform the biopsy around day 5 or 6 of development.[9] Sex selection is the attempt to control the sex of offspring to achieve a desired sex. It can be accomplished in several ways, both pre- and post-implantation of an embryo, as well as at birth. Pre-implantation techniques include PGD, but also sperm sorting.


Other assisted reproduction techniques include:


The majority of IVF-conceived infants do not have birth defects.[12] However, some studies have suggested that assisted reproductive technology is associated with an increased risk of birth defects.[13][14] Artificial reproductive technology is becoming more available. Early studies suggest that there could be an increased risk for medical complications with both the mother and baby. Some of these include low birth weight, placental insufficiency, chromosomal disorders, preterm deliveries, gestational diabetes, and pre-eclampsia (Aiken and Brockelsby).[15]

In the largest U.S. study, which used data from a statewide registry of birth defects,[16] 6.2% of IVF-conceived children had major defects, as compared with 4.4% of naturally conceived children matched for maternal age and other factors (odds ratio, 1.3; 95% confidence interval, 1.00 to 1.67).[12] ART carries with it a risk for heterotopic pregnancy (simultaneous intrauterine and extrauterine pregnancy).[17] The main risks are:

Sperm donation is an exception, with a birth defect rate of almost a fifth compared to the general population. It may be explained by that sperm banks accept only people with high sperm count.

Current data indicate little or no increased risk for postpartum depression among women who use ART.[21]

Usage of assisted reproductive technology including ovarian stimulation and in vitro fertilization have been associated with an increased overall risk of childhood cancer in the offspring, which may be caused by the same original disease or condition that caused the infertility or subfertility in the mother or father.[22]

That said, In a landmark paper by Jacques Balayla et al. it was determined that infants born after ART have similar neurodevelopment than infants born after natural conception.[23]


As a result of the 1992 Fertility Clinic Success Rate and Certification Act, the CDC is required to publish the annual ART success rates at U.S. fertility clinics[24]. Assisted reproductive technology procedures performed in the U.S. has over than doubled over the last 10 years, with 140,000 procedures in 2006,[25] resulting in 55,000 births.[25]

In Australia, 3.1% of births are a result of ART.[26]

The most common reasons for discontinuation of fertility treatment have been estimated to be: postponement of treatment (39%), physical and psychological burden (19%, psychological burden 14%, physical burden 6.32%), relational and personal problems (17%, personal reasons 9%, relational problems 9%), treatment rejection (13%) and organizational (12%) and clinic (8%) problems.[27]

By country

United States

Many Americans do not have insurance coverage for fertility investigations and treatments. Many states are starting to mandate coverage, and the rate of use is 278% higher in states with complete coverage.[28]

There are some health insurance companies that cover diagnosis of infertility, but frequently once diagnosed will not cover any treatment costs.

Approximate treatment/diagnosis costs in the United States, with inflation, as of 2018 (US$):

Another way to look at costs is to determine the expected cost of establishing a pregnancy. Thus, if a clomiphene treatment has a chance to establish a pregnancy in 8% of cycles and costs $640, the expected cost is $7,700 to establish a pregnancy, compared to an IVF cycle (cycle fecundity 40%) with a corresponding expected cost of $38,500 ($15,400 × 40%).

For the community as a whole, the cost of IVF on average pays back by 700% by tax from future employment by the conceived human being.[29]

European Union

Number of assisted reproductive technology cycles in Europe between 1997 and 2014.[30][31]

In Europe, 157,500 children were born using assisted reproductive technology in 2015, according to the European Society of Human Reproduction and Embryology (ESHRE).[30] But there are major differences in legislation across the Old Continent. A European directive fixes standards concerning the use of human tissue and cells,[32] but all ethical and legal questions on ART remain the prerogative of EU member states.

Conditions of assisted reproductive technology in different European countries.[30][33]
  ART authorized for lesbian couples
  ART authorized for single women
  ART authorized for single women and lesbian couples
  ART prohibited for single women and lesbian couples

Across Europe, the legal criteria per availability vary somewhat.[34] In 10 countries all women may benefit; in 10 others only heterosexual couples are concerned; in 7 only single women; and in 1 (Austria) only lesbian couples. Spain was the first European country to open ART to all women, in 1977, the year the first sperm bank was opened there. In France, the right to ART is only accorded to heterosexual couples who can justify medical infertility or serious illness. In the last 15 years, legislation has evolved quickly. For example, Portugal made ART available in 2006 with conditions very similar to those in France, before amending the law in 2016 to allow lesbian couples and single women to benefit. Italy clarified its uncertain legal situation in 2004 by adopting Europe’s strictest laws: ART is only available to heterosexual couples, married or otherwise, and sperm donation is prohibited.

Today, 21 countries provide partial public funding for ART treatment. The seven others, which do not, are Ireland, Cyprus, Estonia, Latvia, Luxembourg, Malta, and Romania. Such subsidies are subject to conditions, however. In Belgium, a fixed payment of €1,073 is made for each full cycle of the IVF process. The woman must be aged under 43 and may not carry out more than six cycles of ART. There is also a limit on the number of transferable embryos, which varies according to age and the number of cycles completed. In France, ART is subsidized in full by national health insurance for women up to age 43, with limits of 4 attempts at IVF and 6 at artificial insemination. Germany tightened its conditions for public funding in 2004, which caused a sharp drop in the number of ART cycles carried out, from more than 102,000 in 2003 to fewer than 57,000 the following year. Since then the figure has remained stable.

17 countries limit access to ART according to the age of the woman. 10 countries have established an upper age limit, varying from 40 (Finland, Netherlands) to 50 (including Spain, Greece and Estonia). Since 1994, France is one of a number of countries (including Germany, Spain, and the UK) which use the somewhat vague notion of “natural age of procreation”. In 2017, the steering council of France’s Agency of Biomedicine established an age limit of 43 for women using ART. 10 countries have no age limit for ART. These include Austria, Hungary, Italy and Poland.

Most European countries allow donations of gametes by third parties. But the situations vary depending on whether sperm or eggs are concerned. Sperm donations are authorized in 20 EU member states; in 11 of them anonymity is allowed. Egg donations are possible in 17 states, including 8 under anonymous conditions. On 12 April, the Council of Europe adopted a recommendation which encourages an end to anonymity.[35] In the UK, anonymous sperm donations ended in 2005 and children have access to the identity of the donor when they reach adulthood. In France, the principle of anonymous donations of sperm or embryos is maintained in the law of bioethics of 2011, but a new bill under discussion may change the situation.[36]

United Kingdom

In the United Kingdom, all patients have the right to preliminary testing, provided free of charge by the National Health Service (NHS). However, treatment is not widely available on the NHS and there can be long waiting lists. Many patients therefore pay for immediate treatment within the NHS or seek help from private clinics.

In 2013, the National Institute for Health and Care Excellence (NICE) published new guidelines about who should have access to IVF treatment on the NHS in England and Wales.[37]

The guidelines say women aged between 40 and 42 should be offered one cycle of IVF on the NHS if they have never had IVF treatment before, have no evidence of low ovarian reserve (this is when eggs in the ovary are low in number, or low in quality), and have been informed of the additional implications of IVF and pregnancy at this age. However, if tests show IVF is the only treatment likely to help them get pregnant, women should be referred for IVF straight away.

This policy is often modified by local Clinical Commissioning Groups, in a fairly blatant breach of the NHS Constitution for England which provides that patients have the right to drugs and treatments that have been recommended by NICE for use in the NHS. For example, the Cheshire, Merseyside and West Lancashire Clinical Commissioning Group insists on additional conditions:[38]

  • The person undergoing treatment must have commenced treatment before her 40th birthday;
  • The person undergoing treatment must have a BMI of between 19 and 29;
  • Neither partner must have any living children, from either the current or previous relationships. This includes adopted as well as biological children; and,
  • Sub-fertility must not be the direct result of a sterilisation procedure in either partner (this does not include conditions where sterilisation occurs as a result of another medical problem). Couples who have undertaken a reversal of their sterilisation procedure are not eligible for treatment.


Some treatments are covered by OHIP (public health insurance) in Ontario and others are not. Women with bilaterally blocked fallopian tubes and are under the age of 40 have treatment covered but are still required to pay test fees (around CA$3,000–4,000). Coverage varies in other provinces. Most other patients are required to pay for treatments themselves.[39]


Israel's national health insurance, which is mandatory for all Israeli citizens, covers nearly all fertility treatments. IVF costs are fully subsidized up to the birth of two children for all Israeli women, including single women and lesbian couples. Embryo transfers for purposes of gestational surrogacy are also covered.[40]


On 27 January 2009, the Federal Constitutional Court ruled that it is unconstitutional, that the health insurance companies have to bear only 50% of the cost for IVF.[41] On 2 March 2012, the Federal Council has approved a draft law of some federal states, which provides that the federal government provides a subsidy of 25% to the cost. Thus, the share of costs borne for the pair would drop to just 25%.[42]

Society and culture


Some couples may find it difficult to stop treatment despite very bad prognosis, resulting in futile therapies. This has the potential to give ART providers a difficult decision of whether to continue or refuse treatment.[43]

Some assisted reproductive technologies have the potential to be harmful to both the mother and child, posing a psychological and/or physical health risk, which may impact the ongoing use of these treatments.

Fictional representation

Films and other fiction depicting emotional struggles of assisted reproductive technology have had an upswing in the latter part of the 2000s decade, although the techniques have been available for decades.[44] As ART becomes more utilized, the number of people that can relate to it by personal experience in one way or another is growing.[44]

For specific examples, refer to the fiction sections in individual subarticles, e.g. surrogacy, sperm donation and fertility clinic.

In addition, reproduction and pregnancy in speculative fiction has been present for many decades.

Research and speculative uses

The idea of using future ART techniques, including direct human germline engineering technologies, to select and genetically modify embryos for the purpose of human enhancement has been referred to as designer babies, reprogenetics, and liberal eugenics and has been discussed since the introduction of biotechnology in the late 1970s.[45][46][47][48][49][50]

The term "liberal eugenics" was coined by bioethicist Nicholas Agar.[51][52] Liberal eugenics is aimed at "improving" the genotypes of future generations through screening and genetic modification to eliminate "undesirable" traits. The term "reprogenetics" was coined by Lee M. Silver, a professor of molecular biology at Princeton University, in his 1997 book Remaking Eden.[53][54]

The philosophical movement associated with these speculative uses is transhumanism.[55][56] When eugenics is discussed in this context it usually in context of allowing parents to select desirable traits in an unborn child and not in the use of genetics to destroy embryos or to prevent the formation of undesirable embryos.

This procedure does not have to encompass liberal eugenics in terms of human enhancement though. It could be an option for both women and men unable to conceive a child naturally, as well as same-sex couples.[57]

Safety is a major concern when it comes to the gene editing and mitochondrial transfer, as problems may not arise in the first children for many years, and their offspring may be affected, and problems may only appear in those subsequent generations.[58][59][60] New diseases may be introduced accidentally.[61][62]

Neither the first generation nor their offspring will have given consent to have been treated.[59] On a larger scale, germline modification has the potential to impact the gene pool of the entire human race in a negative or positive way.[63]

Another concern, especially for people who believe that life begins at conception, is the fate of flawed or unchosen embryos created during the work of reaching an embryo with the desired qualities.[59] The embryo cannot give consent and some of the treatments have long-lasting and harmful implications.[59]

In many countries, editing embryos and germline modification is illegal.[64] As of 2015, 15 of 22 Western European nations had outlawed human germline engineering.[65] Human germline modification has for many years has been heavily off limits. As of 2016 there was no legislation in the United States that explicitly prohibited germline engineering, however, the Consolidated Appropriation Act of 2016 banned the use of U.S. Food and Drug Administration (FDA) funds to engage in research regarding human germline modifications.[66]

Germline modification is considered a more ethically and morally acceptable treatment when one or both of the parents is a carrier for a harmful trait and is treated to improve the genotype and safety of the future generations.[59] When the treatment is used for this purpose, it can fill the gaps that other technologies may not be able to accomplish.[63] The American National Academy of Sciences and National Academy of Medicine gave qualified support to human genome editing in 2017 once answers have been found to safety and efficiency problems "but only for serious conditions under stringent oversight."[67] Germline modification would be more practical if sampling methods were less destructive and used the polar bodies rather than embryos.[59] In 2018, the Nuffield Council on Bioethics issued a report which concluded that under certain circumstances, editing of the DNA of human embryos could be acceptable.[68] The Nuffield Council is a British independent organisation that evaluates ethical questions in medicine and biology.

Lee Silver has projected a dystopia in which a race of superior humans look down on those without genetic enhancements, though others have counseled against accepting this vision of the future.[53] It has also been suggested that if designer babies were created through genetic engineering, that this could have deleterious effects on the human gene pool.[69] Some futurists claim that it would put the human species on a path to participant evolution.[53][70] It has also been argued that designer babies may have an important role as counter-acting an argued dysgenic trend.[71]

In November 2018, Jiankui He announced that he had edited the genomes of two human embryos, to attempt to disable the gene for CCR5, which codes for a receptor that HIV uses to enter cells. He said that twin girls, Lulu and Nana, had been born a few weeks earlier. He said that the girls still carried functional copies of CCR5 along with disabled CCR5 (mosaicism) and were still vulnerable to HIV. The work was widely condemned as unethical, dangerous, and premature.[72] Carl Zimmer compared the reaction to He's human gene editing experiment to the initial reactions and subsequent debate over mitochondrial replacement therapy (MRT) and the eventual regulatory approval of MRT in the United Kingdom.[73]

See also


 This article incorporates text from a free content work. Licensed under CC BY 4.0 How does assisted reproductive technology work in Europe?, Orlane Jézéquélou/Alternatives Economiques, EDJNet. To learn how to add open license text to Wikipedia articles, please see this how-to page. For information on reusing text from Wikipedia, please see the terms of use.

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