Some Terms Explained
When a treatment cycle is stopped before egg collection.
A doctor who specialises in treating male fertility problems.
This is an ultrasound scan to check that down regulation drugs have worked. It is usually a vaginal scan.
An embryo when it is 5 or 6 days old.
Small bodies within the nucleus of every cell in the body, which contain the genes.
Ultrasound evidence of a fetal heart
This is calculated as the proportion of pregnancies with beating heart for every 100 treatment cycles commenced.
Deformities or diseases which are present at birth or show themselves soon after birth.
The freezing of eggs, sperm or embryos and their storage in liquid nitrogen.
A disorder of the mucus-secreting glands of the lungs, the pancreas, the mouth and the gastro-intestinal tract. The commonest serious genetic disease in Caucasian children.
The material between the nucleus and the cell surface.
This is an ultrasound scan to check the response of the ovaries to the stimulation drugs. It is usually a vaginal scan.
The insemination of a woman with donor sperm.
This means that the pituitary function has been ‘switched off’.
A pregnancy that occurs outside the womb.
The procedure to remove eggs from the ovaries, usually performed under sedation.
A fertilised egg up to eight weeks of development. At two weeks it is approximately 1-1.5mm in diameter.
The transfer of one or more embryos to the womb.
A scientist who cultures and studies embryos in a clinical or research laboratory
This term covers any reason why a woman is subfertile, such as ovulation failure or damage to the fallopian tubes.
A fluid filled sac in the ovary, which hopefully contains an egg.
Frozen Embryo Transfer (FET)
A treatment using embryos that have been frozen then thawed.
Follicle stimulating hormone - one of the hormones that controls the menstrual cycle.
A reproductive cell such as a mature egg or a sperm.
Gamete Intra Fallopian Transfer. Sperm and eggs are mixed together and transferred to one or both of a woman’s fallopian tubes.
A doctor who specialises in treating women.
Intra Cytoplasmic Sperm Injection (ICSI)
A micromanipulation technique. A variation of IVF treatment where a single sperm is injected into the inner cellular structure of the egg. This technique is used for couples in which the male partner has severely impaired or few sperm.
Intrauterine Insemination (IUI)
The insertion of specially prepared sperm through the cervical canal into the uterine cavity.
In Vitro Fertilisation (IVF)
Sperm and eggs are collected and put together to achieve fertilisation outside the body.
A test on a sample of blood to check chromosomes.
Luteinizing hormone - one of the hormones that controls the menstrual cycle.
The delivery of one or more babies from a pregnancy.
Live Birth Rate
This is calculated as a proportion of live births for every 100 treatment cycles commenced.
This term covers any reason why the male partner’s sperm may be less effective or incapable of fertilisation, including the absence of viable sperm and a failed reversal of vasectomy.
Spontaneous loss of a pregnancy before 24 weeks.
Birth of more than one baby from a pregnancy.
Multiple Birth Rate
This rate is calculated as a proportion of all births.
The death of a baby within 28 days after the birth.
Ovarian Hyperstimulation Syndrome - a condition in which the ovaries over-respond to fertility drugs. It can range from mild/moderate to severe.
Another name for an egg.
The death of a baby either in the womb after 24 weeks of pregnancy (stillbirth) or within 28 days after the birth.
A female hormone
The small round structures inside an egg that contain the genetic material. Two pronuclei are visible in an egg that has fertilised normally, approximately 24hours after insemination.
A scientist who specialises in examining sperm.
An immature sperm cell.
A treatment cycle in which the woman’s ovaries are stimulated with drugs to produce more than one egg.
Transport (or Satellite) IVF
An arrangement whereby IVF is carried out at a primary centre (HFEA licensed) but other parts of the treatment (eg ovulation induction or egg retrieval) are performed at a secondary centre (not necessarily HFEA licensed). The embryology and embryo transfer take place at the primary centre.
a) IVF/ICSI with fresh embryos: a cycle begins with the administration of drugs for the purpose of superovulation, or if no drugs are used, with the attempt to collect eggs b) With frozen-thawed embryos: a cycle begins with the removal of the stored embryos in order to be thawed and then transferred. c) A Donor Insemination (DI ) treatment cycle begins when the first insemination with donor sperm takes place.