Q.(a) Differentiate between Intrauterine insemination and Intrauterine transfer.
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Start your 14-day free trial to unlock the full solution →Intrauterine Insemination (IUI) involves placing sperm into the uterus to aid fertilization, while Intrauterine Transfer (IUT) involves placing embryos (formed via IVF) into the uterus for implantation. Amniocentesis is positively used for prenatal diagnosis of genetic disorders and negatively misused for illegal sex determination leading to female feticide.
(a) Differentiate between Intrauterine Insemination and Intrauterine Transfer.
The ability to conceive and carry a pregnancy to term can be challenging for some couples. Assisted Reproductive Technologies (ART) offer various methods to overcome infertility by assisting with fertilization or embryo implantation. Both Intrauterine Insemination (IUI) and Intrauterine Transfer (IUT) are ART procedures, but they differ fundamentally in what is transferred and at what stage of reproduction.
The core idea behind both procedures is to bypass certain natural barriers or inefficiencies in the reproductive process by directly placing reproductive cells or early embryos into the uterus. The distinction lies in whether the goal is to facilitate fertilization inside the body (IUI) or to implant an embryo that has already been fertilized outside the body (IUT).
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Intrauterine Insemination (IUI)
IUI is a relatively less invasive ART procedure where processed sperm are directly placed into the woman's uterus. The aim is to increase the number of sperm reaching the fallopian tubes, thereby increasing the chances of fertilization in vivo (inside the body).
- Procedure: Semen is collected from the male partner (or a donor), washed, and concentrated to separate healthy, motile sperm from seminal fluid and less active sperm. This concentrated sperm sample is then inserted into the woman's uterus using a thin catheter, typically around the time of ovulation.
- Purpose: IUI is often recommended for couples facing mild male factor infertility (e.g., low sperm count or motility), cervical factor infertility (where the cervix prevents sperm from entering the uterus), unexplained infertility, or when using donor sperm. It relies on the woman's fallopian tubes being open and functional for fertilization to occur naturally after the sperm are placed.
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Intrauterine Transfer (IUT)
Intrauterine Transfer, specifically in the context of Assisted Reproductive Technology, refers to the final step of In Vitro Fertilization (IVF) where embryos, created and cultured in vitro (outside the body), are placed into the woman's uterus. The goal is for these embryos to implant in the uterine lining and initiate a pregnancy.
- Procedure: Eggs are retrieved from the woman and fertilized with sperm in a laboratory setting (IVF). The resulting embryos are cultured for a few days (typically 3 to 5 days) until they reach a certain developmental stage (cleavage stage or blastocyst stage). One or more selected embryos are then transferred into the woman's uterus using a fine catheter.
- Purpose: IUT is performed after successful IVF, when fertilization has already occurred outside the body. It is used for various causes of infertility, including blocked fallopian tubes, severe male factor infertility, advanced maternal age, or when other ART methods like IUI have failed.
Here is a summary of the key differences:
| Feature | Intrauterine Insemination (IUI) | Intrauterine Transfer (IUT) |
|---|---|---|
| What is transferred? | Processed sperm | Embryos (fertilized eggs) |
| Where does fertilization occur? | In vivo (inside the woman's body, in the fallopian tube) | In vitro (outside the body, in a laboratory dish) |
| Primary purpose | To facilitate fertilization by increasing sperm concentration in the uterus | To achieve implantation of already formed embryos in the uterus |
| Prerequisite | Functional fallopian tubes are generally required | Fertilization has already occurred via IVF |
| Complexity | Less complex, less invasive | More complex, involves egg retrieval and lab culture |
(b) Mention one positive and one negative application of amniocentesis.
Amniocentesis is a prenatal diagnostic procedure where a small sample of amniotic fluid, which surrounds the fetus in the womb, is extracted for analysis. This fluid contains fetal cells that can provide valuable genetic and chromosomal information about the developing baby.
- Positive Application: …
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