Assisted Reproductive Technology
Assisted reproductive technology (ART) is the family of clinical and laboratory procedures in which human oocytes and sperm, or embryos, are handled outside the body to help establish a pregnancy. In vitro fertilization (IVF) is its defining technique: eggs are retrieved after ovarian stimulation, fertilized in the laboratory, and the resulting embryos are cultured and transferred to the uterus. ART has reshaped the treatment of infertility since the first IVF birth in 1978.
Definition
Assisted reproductive technology comprises procedures that involve the in vitro handling of human gametes or embryos to achieve pregnancy. By convention it centres on IVF and related laboratory techniques; the World Health Organization and many registries restrict the term to procedures in which oocytes are retrieved, generally excluding insemination alone.
Scope
This area orients the reader to the sequence of steps that make up an ART cycle and to the topics that examine each step in detail: controlled ovarian stimulation, oocyte retrieval and laboratory fertilization, embryo culture, embryo transfer and implantation, the outcomes that measure success, and the simpler procedure of intrauterine insemination. It is a reference map of the field, not a treatment protocol.
Sub-topics
Core questions
- What sequence of biological steps must succeed for an ART cycle to result in a live birth?
- How do ovarian stimulation, fertilization method, embryo culture, and transfer interact to determine outcomes?
- How is the success of ART measured, and why do per-cycle and cumulative live-birth rates differ?
- Where does intrauterine insemination sit relative to IVF in the spectrum of assisted conception?
Key concepts
- In vitro fertilization (IVF)
- Intracytoplasmic sperm injection (ICSI)
- Controlled ovarian stimulation
- Oocyte retrieval
- Embryo culture and transfer
- Implantation
- Live-birth rate and cumulative live-birth rate
- Intrauterine insemination (IUI)
Mechanisms
An ART cycle chains together several biological and laboratory stages. Gonadotrophins stimulate the ovaries to grow multiple follicles; mature oocytes are then aspirated under ultrasound guidance. In the laboratory, oocytes are fertilized either by conventional insemination or, when sperm function is impaired, by intracytoplasmic sperm injection (ICSI), in which a single spermatozoon is injected directly into the oocyte (Palermo et al., 1992). Resulting embryos are cultured for two to six days and one or more are transferred to the uterus, where implantation may follow. The success of the whole sequence is conventionally summarized as the live-birth rate per cycle, or cumulatively across the embryos generated from one stimulation (Moragianni & Penzias, 2010).
Clinical relevance
ART is the principal medical response to many forms of infertility, and understanding its stages underpins how clinicians, scientists, and patients interpret treatment options and reported success rates. This entry describes the structure of the field for orientation and evidence appraisal; it does not specify protocols, drug regimens, or individualized treatment decisions.
Epidemiology
Since the birth of Louise Brown in 1978 (Steptoe & Edwards, 1978), millions of children have been born following ART, and IVF with or without ICSI now accounts for a measurable share of births in many countries. Outcomes vary strongly with female age and with the number of embryos transferred, and registries increasingly report cumulative live-birth rates per stimulation to capture the full yield of a treatment course (Moragianni & Penzias, 2010).
Evidence & guidelines
The evidence base spans landmark primary reports, randomized trials of stimulation and transfer strategies, and systematic reviews synthesized in sources such as the Cochrane Database; professional bodies including ESHRE and ASRM issue practice guidance. The detailed evidence is presented in the child topics rather than summarized here.
History
The modern field began with the collaboration of physiologist Robert Edwards and gynaecologist Patrick Steptoe, whose work on human oocyte maturation, fertilization, and laparoscopic egg recovery culminated in the first IVF birth in 1978 (Steptoe & Edwards, 1978); Edwards received the 2010 Nobel Prize in Physiology or Medicine. The introduction of ICSI in 1992 extended ART to severe male-factor infertility (Palermo et al., 1992), and subsequent decades brought ovarian-stimulation regimens, extended embryo culture, cryopreservation, and a steady refinement of laboratory and transfer techniques.
Key figures
- Robert Edwards
- Patrick Steptoe
- Gianpiero Palermo
- André Van Steirteghem
Related topics
Seminal works
- steptoe-edwards-1978
- palermo-1992
Frequently asked questions
- What is the difference between ART and IVF?
- IVF is the central technique within ART, in which fertilization occurs in the laboratory. ART is the broader category that includes IVF along with related procedures such as ICSI and the laboratory handling of gametes and embryos; by convention it generally refers to procedures that involve retrieving oocytes.
- Is intrauterine insemination considered ART?
- Definitions vary. Many registries and the World Health Organization reserve the term ART for procedures that involve oocyte retrieval and laboratory handling, and therefore classify intrauterine insemination, in which prepared sperm is placed in the uterus without egg retrieval, as a separate, simpler form of assisted conception.