IVF, ZIFT, IUT, GIFT, ICSI, AI and IUI: I still swap what goes where, can someone sort them?
Siddharth RaoDropper Sample
9 Oct 2026 Β· 1 min read
Second attempt, and ART is the topic where I can feel the marks sliding even while I'm reading. The full forms are easy. It's "what is transferred, and where" that I keep swapping.
What I have so far:
- Infertility: inability to produce children in spite of unprotected sexual cohabitation. Causes can be physical, congenital, diseases, drugs, immunological or even psychological.
- IVF: fertilisation outside the body, in conditions like those in the body, followed by embryo transfer (ET). The "test tube baby" programme.
- ZIFT: zygote or early embryo (up to 8 blastomeres) transferred into the fallopian tube.
- IUT: embryo with more than 8 blastomeres transferred into the uterus.
- GIFT: transfer of a gamete (ovum from a donor) into the fallopian tube.
- ICSI: sperm directly injected into the ovum.
- AI / IUI: semen introduced artificially into the vagina or uterus.
I think this is right, but every time I see an assertion-reason question I second-guess myself. Which of these is "fertilisation inside the body" and which is "outside"? And what is the difference between GIFT and ZIFT in one line?
7 answers & replies
Sign in to join the conversation.
[+][β]Tanvi Deshmukh12thSampleΒ· 10d ago
Your list is correct!! I'll just add the "inside vs outside" tags for you:
- IVF (fertilisation outside, in the lab) β then either ZIFT or IUT
- ZIFT: zygote/early embryo up to 8 blastomeres β fallopian tube
- IUT: embryo with more than 8 blastomeres β uterus
- GIFT: gametes (not an embryo) β fallopian tube, so fertilisation happens inside the body
- ICSI: the sperm is injected into the ovum in the lab β embryo formed outside β transfer
- AI/IUI: semen put into the vagina/uterus, so fertilisation is inside the body The "8 blastomeres" number is the one that is always asked.
[+][β]Dev Agarwal12thSampleΒ· 10d ago
as someone from the "everything is a pipeline" side, tanvi's list is basically a flowchart. IVF β (β€8 cells) β ZIFT, (>8 cells) β IUT. I'd print it. the numbers are what make or break the question
[+][β]Ishita GoyalDropperSampleΒ· 10d ago
GIFT vs ZIFT in one line: GIFT transfers a gamete (ovum from a donor) to the fallopian tube of a female who cannot produce an ovum but can provide a suitable environment for fertilisation and development; ZIFT transfers a zygote/early embryo (formed in the lab) into the fallopian tube. Easy way: G = gamete, Z = zygote. The "I" = intra, "F" = fallopian, "T" = transfer.
[+][β]Lakshmi TripathiDropperSampleΒ· 10d ago
ICSI: I think the sperm is injected into the uterus directly so that it doesn't have to swim, and it's used when the sperm count is low? And AI is when the egg is put into the husband...
[+][β]Zoya Khan12thSampleΒ· 10d ago
Lakshmi, the ICSI one is reversed. In ICSI (intra cytoplasmic sperm injection) the sperm is injected directly into the ovum, in the laboratory, to form an embryo, and then the embryo is transferred (that's why it is useful when the male partner has a very low sperm count or poor motility). The injection into the uterus is something else, that's IUI (intra uterine insemination), which is a type of artificial insemination where the semen is introduced into the uterus. And in AI, semen from the husband or a healthy donor is introduced into the vagina or the uterus. Nothing happens with an egg being put into a husband, hehe.
[+][β]Lakshmi TripathiDropperSampleΒ· 10d ago
okay, I had mixed it up. thank you zoya, injecting directly into the ovum is clear now
[+][β]Rahul DubeyDropperSampleΒ· 10d ago
Something I'd add for the human side. Infertility is a medical condition and not anyone's fault. NCERT says couples can go to infertility clinics to find the cause, and ART exists to help them have children. Sometimes the cause is on the male side, sometimes female, sometimes psychological, sometimes unknown. For the exam you need the terms, but I think it's better to be kind about the topic as well.
