Assisted Reproductive Technologies
உதவி இனப்பெருக்க தொழில்நுட்பங்கள்
Infertility is not just a social issue; it is a failure of biological compatibility. When gamete transport or fertilization fails, evolution stops. ART is the clinical intervention to bypass these physiological barriers.
The idea
Assisted Reproductive Technologies (ART) are clinical procedures to assist infertile couples. IVF involves fertilization outside the body, followed by ZIFT (zygote transfer into the fallopian tube) or IUT (embryo transfer into the uterus). GIFT involves transferring gametes into the fallopian tube of a donor. ICSI is a specialized procedure where a sperm is directly injected into the ovum.
Why it matters
These technologies exist to bypass biological barriers to fertilization and implantation, allowing infertile couples to achieve pregnancy.
NEET lens
NEET focuses on the site of transfer: ZIFT (up to 8 blastomeres) vs IUT (more than 8 blastomeres). Do not confuse GIFT with ZIFT; GIFT requires functional fallopian tubes. Memorize the specific acronyms and their exact definitions, as NTA frequently swaps these in matching-type questions.
Clinical significance
ART is indicated in cases of tubal blockage, oligospermia, or unexplained infertility. Failure of these technologies often points to underlying genetic incompatibility or poor oocyte quality. Without these, the reproductive cycle remains permanently arrested in affected individuals.
Introduction
Assisted Reproductive Technologies (ART) are medical procedures that handle eggs, sperm, or embryos outside the body (or assist their natural function) to achieve pregnancy in infertile couples, including IVF, ICSI, GIFT, ZIFT, and IUI.
Core concept
Main ART procedures: (1) IVF (In Vitro Fertilization) + ET (Embryo Transfer): eggs retrieved from ovary → fertilized with sperm in lab → embryo cultured → transferred to uterus. (2) ICSI (Intra-Cytoplasmic Sperm Injection): single sperm injected directly into egg (for severe male factor infertility). (3) GIFT (Gamete Intra-Fallopian Transfer): eggs + sperm transferred to fallopian tube (fertilization occurs in tube, not lab). Requires open tubes. (4) ZIFT (Zygote Intra-Fallopian Transfer): zygote (fertilized in lab) transferred to fallopian tube. (5) IUI (Intra-Uterine Insemination): washed sperm placed directly in uterus (mild male factor, unexplained infertility). Surrogacy: embryo gestated by another woman (surrogate). Sperm donation, egg donation, embryo donation: use of third-party gametes.
Go deeper
IVF process detail: (1) Ovarian stimulation (gonadotropins) → multiple follicles. (2) GnRH agonist/antagonist prevents premature LH surge. (3) hCG trigger shot → oocyte maturation. (4) Egg retrieval (transvaginal ultrasound-guided, 36 hours after trigger). (5) Sperm preparation (capacitation). (6) Insemination or ICSI. (7) Embryo culture (Day 3 or Day 5 blastocyst). (8) Embryo transfer (1-2 embryos). (9) Luteal support (progesterone). (10) Pregnancy test 14 days later. Louise Brown: first IVF baby, born 1978, UK.
From Class 10
When couples cannot conceive naturally, medical technologies can help. These are called Assisted Reproductive Technologies (ART).