Glossary of Fertility & Infertility Terms
Demystify the complex medical terminology of reproductive endocrinology. From diagnostic hormone tests and ovulation induction to advanced embryology technologies, explore doctor-verified definitions.
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Navigating fertility care involves encountering specialized medical acronyms, physiological concepts, and laboratory terms. Use the search bar below or click any letter to instantly filter our comprehensive clinical glossary.
A
Advanced Maternal Age (AMA) Clinical Term
In reproductive medicine, female patients aged 35 years or older at the anticipated time of delivery. Because ovarian reserve and egg chromosomal normalcy decline with age, earlier diagnostic evaluation (after 6 months of trying) is recommended.
Anti-Müllerian Hormone (AMH) Hormone / Diagnostic
A hormone secreted by the granulosa cells of small growing (pre-antral and antral) ovarian follicles. Serum AMH levels provide one of the most reliable blood indicators of a woman’s remaining ovarian egg reserve and help predict ovarian response during IVF stimulation protocols.
Antral Follicle Count (AFC) Ultrasound Diagnostic
A transvaginal ultrasound assessment performed early in the menstrual cycle (Days 2–4) to count resting follicles measuring 2–10 mm in both ovaries. Together with AMH, AFC establishes baseline ovarian reserve.
Assisted Hatching (AH) Lab Technology
A micromanipulation technique performed in the embryology laboratory where an embryologist uses a precision laser to create a microscopic opening in the outer shell (zona pellucida) of an embryo, facilitating its natural hatching and implantation into the uterine wall.
Azoospermia Male Fertility
The complete absence of measurable spermatozoa in the ejaculate. It can be obstructive (caused by a physical blockage in the reproductive tract) or non-obstructive (due to impaired sperm production in the testes).
B
Beta hCG (Quantitative Blood Pregnancy Test) Diagnostic
A quantitative blood test measuring human chorionic gonadotropin hormone secreted by developing trophoblast cells. Serum beta hCG levels confirm pregnancy and assess early developmental viability.
Blastocyst Embryology
An advanced embryo stage reached on Day 5 or 6 of laboratory culture. A blastocyst consists of approximately 100–200 cells divided into an inner cell mass (which becomes the fetus) and an outer trophectoderm layer (which forms the placenta and membranes).
C
Clomiphene Citrate (Clomid / Serophene) Medication
An oral selective estrogen receptor modulator (anti-estrogen) used to induce ovulation in women with irregular or absent cycles (such as in PCOS). It works by blocking estrogen receptors in the hypothalamus, prompting the pituitary gland to release increased FSH and LH, thereby stimulating follicular growth.
Cryopreservation (Vitrification) Lab Technology
The ultra-rapid freezing of oocytes (eggs), sperm, or embryos in liquid nitrogen at -196°C using cryoprotectants. Modern flash-freezing (vitrification) prevents ice crystal formation, achieving post-thaw survival rates exceeding 95%.
D
Diethylstilbestrol (DES) Clinical History
A synthetic non-steroidal estrogen prescribed to pregnant women between 1938 and 1971. In utero fetal exposure is linked to anatomical uterine structural abnormalities (such as T-shaped uterus) and cervical incompetence.
Diminished Ovarian Reserve (DOR) Diagnosis
A clinical diagnosis where a woman has fewer eggs remaining in her ovaries than expected for her biological age, characterized by low AMH, low AFC, and elevated Day 3 FSH.
Donor Egg IVF (Donor Oocytes) Third-Party Care
An IVF procedure in which eggs donated by a screened, young egg donor are fertilized with partner or donor sperm to create embryos for transfer into the intended mother or gestational surrogate.
E
Ectopic Pregnancy Clinical Condition
A pregnancy complication where the fertilized embryo implants outside the endometrial lining of the uterine cavity, most commonly within the fallopian tube. It requires prompt medical intervention.
Egg Retrieval (Oocyte Pick-Up / Aspiration) Procedure
A minor outpatient surgical procedure performed under conscious sedation where mature eggs are gently aspirated from ovarian follicles using a fine needle guided by transvaginal ultrasound.
Embryo Transfer (ET) Procedure
The painless placement of one or more carefully selected laboratory-cultured embryos into the mother's uterine cavity using a soft, flexible catheter under ultrasound guidance.
Endometriosis Condition
A chronic inflammatory condition where endometrial-like tissue grows outside the uterus on pelvic organs, fallopian tubes, or ovaries (forming endometriomas / chocolate cysts), causing pelvic pain and anatomical or immunological infertility.
Estradiol (E2) Hormone
The primary form of estrogen produced by maturing ovarian follicles. Estradiol stimulates the thickening of the endometrium (uterine lining) and provides feedback to the brain's pituitary gland.
F
Fallopian Tubes Anatomy
The paired muscular tubes extending from the uterus toward the ovaries. The distal ends (fimbriae) capture ovulated eggs, providing the natural site for fertilization before the developing embryo travels into the uterus.
Follicle Anatomy
Fluid-filled cystic sacs within the ovary containing an immature microscopic oocyte (egg). Follicles enlarge under the stimulation of FSH until ovulation occurs.
Follicle Stimulating Hormone (FSH) Hormone
A gonadotropin hormone produced by the anterior pituitary gland that stimulates ovarian follicular growth in women and supports spermatogenesis in men.
Frozen Embryo Transfer (FET) Treatment
A treatment cycle in which cryopreserved embryos are thawed and transferred into a hormonally prepared, receptive uterine lining.
G
Gestational Carrier (Surrogate) Third-Party Care
A woman who agrees to carry a pregnancy for intended parents through IVF and embryo transfer, having no genetic relationship to the child she delivers.
Gonadotropins (FSH, LH, hMG) Hormones / Medications
Hormones normally secreted by the pituitary gland that direct ovarian and testicular function. Injectable pharmaceutical preparations (e.g., Gonal-F, Follistim, Menopur) are used in controlled ovarian stimulation for IVF and superovulation.
H
Human Chorionic Gonadotropin (hCG / Trigger Shot) Medication / Hormone
A hormone structurally similar to LH, used as a "trigger injection" (e.g., Ovidrel, Pregnyl) to induce final oocyte maturation and ovulation approximately 36 hours prior to egg retrieval or IUI.
Hysterosalpingogram (HSG) Diagnostic Procedure
A specialized fluoroscopic X-ray examination where radio-opaque contrast dye is infused through the cervix to evaluate the contour of the uterine cavity and confirm bilateral fallopian tube patency (openness).
Hysteroscopy Procedure
A diagnostic or operative procedure utilizing a miniature optical camera (hysteroscope) inserted through the cervix to directly inspect and treat uterine abnormalities such as polyps, fibroids, or scar tissue (Asherman's syndrome).
I
Intracytoplasmic Sperm Injection (ICSI) Lab Technology
A precision micro-insemination technique where a single healthy sperm is micro-injected directly into the cytoplasm of a mature egg under high-magnification microscopy, overcoming severe male factor infertility.
Infertility (Primary & Secondary) Diagnosis
The clinical inability to achieve a clinical pregnancy after 12 months of regular, unprotected intercourse (or after 6 months for women aged 35 and older). Primary infertility applies to couples who have never conceived; secondary infertility applies to couples who have previously conceived but are now unable to achieve pregnancy.
Intrauterine Insemination (IUI) Treatment
A fertility treatment in which a concentrated, washed sperm sample containing highly motile sperm is placed directly into the uterine cavity near the time of ovulation via a thin catheter.
In Vitro Fertilization (IVF) Core Treatment
An assisted reproductive technology (ART) procedure involving controlled ovarian stimulation, transvaginal egg retrieval, laboratory fertilization with sperm, extended embryo culture, and subsequent embryo transfer into the uterus.
K
Karyotyping (Chromosomal Analysis) Genetics
A comprehensive blood test that analyzes the number and physical structure of an individual’s 46 chromosomes to detect balanced translocations, inversions, or other structural abnormalities associated with recurrent miscarriage or severe male infertility.
L
Letrozole (Femara) Medication
An oral aromatase inhibitor that temporarily suppresses estrogen synthesis, causing the pituitary gland to increase FSH secretion. Widely used for ovulation induction, particularly in patients with PCOS.
Luteinizing Hormone (LH) Hormone
A pituitary gonadotropin hormone whose rapid mid-cycle surge triggers the final maturation and release of the egg (ovulation) from the dominant ovarian follicle.
M
Male Factor Infertility Diagnosis
Any condition contributing to infertility caused by abnormal semen quality, including low sperm concentration (oligospermia), poor motility (asthenospermia), abnormal sperm morphology (teratospermia), or anatomical blockages.
Morphology (Strict Kruger Morphology) Male Fertility
The percentage of sperm in an ejaculate that exhibit normal head, midpiece, and tail dimensions based on strict World Health Organization (WHO) and Kruger criteria.
Motility (Progressive Motility) Male Fertility
The percentage of sperm that are moving normally, specifically those demonstrating forward (progressive) swimming movement essential to travel through the female reproductive tract.
N
Natural Cycle IVF Treatment
An in vitro fertilization protocol that does not use stimulating gonadotropins, instead tracking and retrieving the single naturally selected egg produced during the patient’s spontaneous monthly cycle.
O
Oligospermia Male Fertility
A clinical semen parameter indicating a low sperm count, typically defined as fewer than 15 million sperm per milliliter of ejaculate.
Oocyte (Ovum / Egg) Biology
The female reproductive cell (gamete) produced within the ovarian follicles that contains maternal genetic material.
Ovarian Hyperstimulation Syndrome (OHSS) Clinical Condition
A potential complication of fertility medications where ovaries become swollen and fluid shifts into the abdomen and chest. VCRM utilizes modern antagonist protocols and Lupron triggers to virtually eliminate severe OHSS risk.
Ovarian Reserve Core Concept
The reproductive capacity and resting egg supply within a woman’s ovaries. Evaluated using maternal age, serum AMH, Day 3 FSH/Estradiol, and ultrasound antral follicle count (AFC).
Ovulation Physiology
The physiological process whereby a mature ovarian follicle ruptures in response to the mid-cycle LH surge, releasing the egg into the fallopian tube.
P
Polycystic Ovary Syndrome (PCOS) Condition
A widespread endocrine and metabolic disorder characterized by irregular or absent ovulation (oligo-anovulation), elevated androgen levels (hyperandrogenism), and characteristic polycystic ovarian morphology on ultrasound.
Preimplantation Genetic Testing (PGT-A / PGT-M) Genetics / ART
Advanced molecular genetic screening of biopsied embryo trophectoderm cells prior to transfer. PGT-A (formerly PGS) screens for whole-chromosome aneuploidies (Down syndrome, Turner syndrome), while PGT-M (formerly PGD) tests for specific monogenic single-gene inherited disorders (Cystic Fibrosis, BRCA mutations, Sickle Cell).
Progesterone (P4) Hormone
A steroid hormone secreted by the corpus luteum following ovulation. Progesterone transforms the estrogen-primed endometrium into a secretory state receptive to embryo implantation and supports early pregnancy.
R
Recurrent Pregnancy Loss (RPL) Condition
The occurrence of two or more consecutive clinical pregnancy losses, warranting comprehensive reproductive, genetic, immunological, and anatomical evaluation.
Reproductive Endocrinologist (REI Specialist) Physician
A board-certified OB/GYN physician with an additional 3 years of subspecialty fellowship training in reproductive endocrinology, infertility, and assisted reproductive surgical techniques (such as Dr. Fady Sharara).
S
SART (Society for Assisted Reproductive Technology) Organization
The primary organization of medical professionals dedicated to the practice of assisted reproductive technologies in the United States, providing audited clinical clinic outcome reporting.
Semen Analysis Diagnostic
The cornerstone diagnostic evaluation of male fertility, evaluating volume, sperm concentration, progressive motility, vitality, and strict morphology.
T
Teratospermia Male Fertility
A semen parameter indicating that a high percentage of sperm possess abnormal head, neck, or tail structural morphology.
Trophectoderm Embryology
The outer single-cell layer of a Day 5/6 blastocyst that later forms the placenta. Biopsies for PGT genetic testing are safely taken exclusively from this layer, leaving the inner cell mass untouched.
U
Unexplained Infertility Diagnosis
A diagnosis assigned when standard clinical fertility evaluations (semen analysis, ovarian reserve, ovulation verification, and HSG tubal patency) demonstrate normal parameters, yet pregnancy has not occurred.
V
Varicocele Male Anatomy
An abnormal dilation and enlargement of the pampiniform venous plexus within the scrotum, causing increased testicular temperature and oxidative stress that can impair sperm production and DNA integrity.
Vitrification Cryobiology
An ultra-rapid, glass-like cryopreservation method for freezing eggs and embryos that eliminates damaging ice crystal formation.
Z
Zona Pellucida Biology
The protective glycoprotein shell surrounding the mammalian oocyte and early embryo, which sperm must penetrate to fertilize the egg.
Zygote Embryology
The single diploid cell resulting from the successful fusion of an egg and sperm prior to the initiation of cellular cleavage divisions.
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Clinical Medical Disclaimer
The definitions and information provided in this glossary are intended for educational purposes to assist patients in understanding reproductive physiology and fertility treatment concepts. Individual diagnostic findings and treatment protocols vary. Please consult with board-certified reproductive endocrinologist Dr. Fady Sharara for personalized clinical recommendations.
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