What is the fundamental difference between GIFT and ZIFT in NEET questions?

In $\text{GIFT}$ ($\text{Gamete Intra-Fallopian Transfer}$), unfertilized eggs and sperms are transferred into the fallopian tube, meaning fertilization occurs *in vivo* (inside the body). In $\text{ZIFT}$ ($\text{Zygote Intra-Fallopian Transfer}$), fertilization is performed *in vitro* (in the lab), and the resulting zygote or embryo at $\le 8\text{ blastomeres}$ is transferred into the fallopian tube.

How do copper-releasing IUDs like $\text{CuT}$ prevent pregnancy?

Copper ions ($\text{Cu}^{2+}$) released by devices such as $\text{CuT}$, $\text{Cu7}$, and $\text{Multiload 375}$ suppress sperm motility and significantly reduce the fertilizing capacity of sperms while promoting phagocytosis of sperms within the uterus.

What is the critical timeline for Medical Termination of Pregnancy (MTP) safety?

MTP is considered safest during the first trimester, i.e., up to $12\text{ weeks}$ of pregnancy. Second-trimester terminations (up to $24\text{ weeks}$ under amended Indian regulations) carry significantly higher risk to maternal health.

Reproductive Health NEET Notes, Formulas, Traps & PYQs | ExamiFly

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Key Formulas & High-Yield Equations

Periodic Abstinence Rhythm Window

$\text{Abstinence Window} = \text{Day } 10 \text{ to Day } 17 \text{ of menstrual cycle}$

Applies strictly to females with regular

28

30\text{ day}

menstrual cycles. High failure rate (

15

28\%

) due to physiological cycle variability.

Emergency Contraceptive Efficacy Window

$\Delta t_{\text{administration}} \le 72\text{ hours}$

Efficacy drops significantly if administered past

72\text{ hours}

post-coitus. Functions primarily by delaying ovulation or blocking implantation.

ART Transfer Decision Rule (ZIFT vs IUT)

$N_{\text{blastomeres}} \le 8 \implies \text{ZIFT (Fallopian Transfer)}; \quad N_{\text{blastomeres}} > 8 \implies \text{IUT (Uterine Transfer)}$

Strict anatomical boundary condition. Embryos at or below

8\text{ blastomeres}

are transferred into the fallopian tube, whereas

>8\text{ blastomeres}

require direct intra-uterine transfer.

MTP Legal Gestation Boundary (India)

$t_{\text{gestation}} \le 12\text{ weeks (1st Trimester)} \quad [\text{Requires } 1 \text{ Medical Practitioner}]$

MTP Amendment Act (

2021

) permits termination up to

12\text{ weeks}

with

1

registered medical practitioner's opinion, and up to

24\text{ weeks}

for specified categories with

2

practitioners' opinions.

Saheli Dosage Protocol

$\text{Dosage} = \begin{cases} 2 \times \text{weekly} & \text{First } 3 \text{ months} \\ 1 \times \text{weekly} & \text{Thereafter} \end{cases}$

Non-steroidal selective estrogen receptor modulator (centchroman /

\text{ORM-10184}

). High contraceptive value with minimal systemic side effects.

Solved High-Yield Sample Questions

Practice Mode

Question #1NEET 2024

Which of the following statements is correct regarding the mechanism of action of hormone-releasing IUDs like $\text{LNG-20}$ ?

Solution Locked

Step-by-Step Solution & Concept

Step 1

Identify the classification of $\text{LNG-20}$ as a hormone-releasing Intra Uterine Device (IUD).

Step 2

Recall that hormone-releasing IUDs continuously release progestogens, altering the cervical mucus consistency and endometrial lining.

Step 3

Conclude that this action prevents sperm entry by thickening cervical mucus and prevents implantation by making the endometrium non-receptive.

Select an option & click Check Answer to reveal solution

Question #2NEET 2023

An infertile couple is advised to undergo an ART procedure where a zygote or early embryo up to $8\text{ blastomeres}$ is transferred directly into the fallopian tube. Identify the specific technique.

Solution Locked

Step-by-Step Solution & Concept

Step 1

Analyze the stage of embryo given in the problem: $N_{\text{blastomeres}} \le 8$ .

Step 2

Differentiate between fallopian tube transfer and uterine transfer. Embryos at $\le 8\text{ blastomeres}$ are placed in the fallopian tube ( $\text{ZIFT}$ ), whereas embryos with $>8\text{ blastomeres}$ are placed in the uterus ( $\text{IUT}$ ).

Step 3

Since the embryo is at $\le 8\text{ blastomeres}$ stage and transferred to the fallopian tube, the correct technique is $\text{ZIFT}$ .

Select an option & click Check Answer to reveal solution

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Mastering Reproductive Health: Concepts, Traps & NEET Strategy | ExamiFly

Chapter Overview

Core Subtopics & Syllabus Breakdown

Key Formulas & High-Yield Equations

Periodic Abstinence Rhythm Window

Emergency Contraceptive Efficacy Window

ART Transfer Decision Rule (ZIFT vs IUT)

MTP Legal Gestation Boundary (India)

Saheli Dosage Protocol

Common Mistakes & Traps to Avoid

Past Year Question (PYQ) Trends

Solved High-Yield Sample Questions

Frequently Asked Questions

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