Infertility and Assisted Reproductive Technologies (ART) IVF, ZIFT, GIFT, ICSI and Related Techniques

 

 

Infertility and Assisted Reproductive Technologies (ART)

IVF, ZIFT, GIFT, ICSI and Related Techniques

1. Introduction

Human reproduction is a highly coordinated biological process involving the production of healthy gametes, fertilization, implantation, embryonic development, and childbirth. Failure of any of these steps may result in infertility. Infertility affects many couples and can arise due to physical, congenital, disease-related, immunological, psychological, or unexplained causes. Assisted Reproductive Technologies (ART) have revolutionized infertility treatment by helping infertile couples achieve pregnancy.

2. Definition of Infertility

Infertility is the inability of a sexually active, non-contracepting couple to achieve pregnancy despite regular unprotected intercourse for an extended period (typically one year or more).

3. Causes of Infertility

A. Female Causes

Ovulatory Disorders

• Anovulation
• Irregular ovulation
• Polycystic ovarian syndrome (PCOS)

Tubal Factors

• Blocked fallopian tubes
• Tubal infections
• Pelvic inflammatory disease

Uterine Factors

• Fibroids
• Congenital abnormalities
• Endometrial defects

Hormonal Disorders

• Thyroid disorders
• Hyperprolactinemia
• Pituitary dysfunction

Endometriosis

• Growth of endometrial tissue outside uterus

Age-related Factors

• Declining ovarian reserve
• Poor oocyte quality

B. Male Causes

Sperm Abnormalities

• Low sperm count (oligospermia)
• No sperm production (azoospermia)
• Poor sperm motility
• Abnormal sperm morphology

Hormonal Disorders

• Testosterone deficiency
• Pituitary disorders

Obstruction

• Vas deferens blockage
• Epididymal blockage

Genetic Factors

• Chromosomal abnormalities

Lifestyle Factors

• Smoking
• Alcohol
• Obesity
• Heat exposure
• Environmental toxins

C. Other Causes

• Immunological infertility
• Psychological factors
• Unexplained infertility

4. Management of Infertility

Treatment depends upon the underlying cause.

Conventional Methods

• Counseling
• Lifestyle modification
• Hormonal therapy
• Surgical correction

Advanced Methods

• Assisted Reproductive Technologies (ART)

5. Assisted Reproductive Technology (ART)

Definition

ART refers to a collection of procedures involving the handling of gametes (sperm/ova) and/or embryos outside the body to achieve pregnancy. These technologies significantly improve the chances of conception in infertile couples.

6. Major ART Techniques

·       IVF-ET- (In Vitro Fertilization and Embryo Transfer)

·       ZIFT- (Zygote Intra-Fallopian Transfer)

·       IUT- (Intra-Uterine Transfer)

·       GIFT- (Gamete Intra-Fallopian Transfer)

·       ICSI- (Intracytoplasmic Sperm Injection)

·       AI- (Artificial Insemination)

·       IUI- (Intra-Uterine Insemination)

·       Surrogacy

7. In Vitro Fertilization (IVF)

Definition

"In vitro" means in the glass or a test tube i.e. outside the body. IVF is a technique in which fertilization occurs in a laboratory under controlled conditions, followed by transfer of the resulting embryo into the female reproductive tract.

IVF Procedure

Step 1: Ovarian Stimulation

• Hormonal injections stimulate multiple follicle development.

Step 2: Oocyte Retrieval

• Mature eggs are collected from ovaries.

Step 3: Sperm Collection

• Sperms collected from husband or donor.

Step 4: Fertilization in Laboratory

• Eggs and sperms are mixed in culture medium.

Step 5: Embryo Formation

• Fertilized egg divides into embryo.

Step 6: Embryo Transfer

• Embryo transferred to female reproductive tract.

Test Tube Baby

The baby born through IVF is commonly called a Test Tube Baby.

Important:

• Fertilization occurs outside the body.
• Development occurs inside the uterus.

Therefore, the baby is NOT developed inside a test tube.

8. Embryo Transfer (ET)

Embryo formed during IVF is transferred into female reproductive tract. Two possibilities exist:

A. ZIFT (Zygote Intra-Fallopian Transfer)

Definition

Transfer of Zygote OR Early embryo (up to 8 blastomeres) into the fallopian tube.

Procedure

1. Fertilization occurs in laboratory.
2. Zygote develops into early embryo.
3. Embryo (≤8 blastomeres) transferred into fallopian tube.

Requirements

• At least one healthy fallopian tube.

Indications

• Tubal dysfunction
• Certain unexplained infertility cases

B. IUT (Intra-Uterine Transfer)

Definition

Transfer of embryos with more than 8 blastomeres directly into the uterus.

Procedure

1. Fertilization in vitro.
2. Embryo cultured until >8 blastomeres.
3. Embryo transferred into uterus.

9. GIFT (Gamete Intra-Fallopian Transfer)

Definition

Transfer of gametes (ova + sperms) into the fallopian tube where fertilization occurs naturally inside the body.

Procedure

Step 1

Collect ovum from donor or wife.

Step 2

Collect sperm from husband.

Step 3

Introduce both gametes into fallopian tube.

Step 4

Fertilization occurs naturally in vivo.

Requirement

At least one functional fallopian tube.

Indication

Women who:

• Cannot produce ova
• But have normal fallopian tubes

Key Feature

Fertilization occurs INSIDE body.

10. ICSI (Intracytoplasmic Sperm Injection)

Definition

A single sperm is directly injected into the cytoplasm of an ovum using micromanipulation techniques.

Procedure

1. Mature ovum collected.
2. Single healthy sperm selected.
3. Sperm injected into ovum.
4. Embryo formed.
5. Embryo transferred into uterus.

Indications

Severe Male Infertility

• Very low sperm count
• Poor sperm motility
• Abnormal sperm morphology

Advantage

Allows fertilization even with extremely poor sperm quality.

11. Artificial Insemination (AI)

Definition

Introduction of semen into female reproductive tract artificially rather than by sexual intercourse.

Types

AIH- Artificial Insemination by Husband

AID- Artificial Insemination by Donor

Indications

• Low sperm count
• Erectile dysfunction
• Ejaculatory disorders

12. Intra-Uterine Insemination (IUI)

Definition

Processed semen is directly introduced into the uterus.

Procedure

1. Semen collected.
2. Motile sperms separated.
3. Sperms injected into uterus.

Advantages

• Simple
• Less invasive
• Less expensive than IVF

Indications

• Mild male infertility
• Cervical factors
• Unexplained infertility

13. Surrogacy

Definition

A woman carries and delivers a baby for another couple.

Types

Traditional Surrogacy- Surrogate provides egg.

Gestational Surrogacy- Embryo from intended parents transferred into surrogate uterus.

Indications

• Absent uterus
• Recurrent pregnancy loss
• Serious medical disorders

14. Donor Programmes

Sperm Donation

Used when: Male partner lacks viable sperm.

Oocyte Donation

Used when: Female partner lacks healthy ova.

Embryo Donation

Used when: Both partners have severe infertility.

15. Comparison of IVF, GIFT and ZIFT

Feature	IVF	GIFT	ZIFT
Full Form	In Vitro Fertilization	Gamete Intra-Fallopian Transfer	Zygote Intra-Fallopian Transfer
Material Transferred	Embryo	Gametes	Zygote/Early Embryo
Fertilization Site	Laboratory	Fallopian Tube	Laboratory
Transfer Site	Uterus/Fallopian Tube	Fallopian Tube	Fallopian Tube
Requires Functional Tube	Not always	Yes	Usually Yes
Fertilization	In vitro	In vivo	In vitro
NCERT Category	ART	ART	ART

 

16. Important Differences Between GIFT and ZIFT

GIFT	ZIFT
Gametes transferred	Zygote transferred
Fertilization inside body	Fertilization outside body
Egg + sperm introduced	Fertilized egg introduced
Entire process not IVF-based	Requires IVF

 

17. Advantages of ART

• Provides hope to infertile couples.
• Helps overcome male infertility.
• Helps overcome female infertility.
• Enables conception despite tubal defects.
• Allows genetic screening in selected cases.
• Improves reproductive success.

18. Limitations and Risks

• Expensive
• Emotional stress
• Multiple pregnancies
• Ovarian hyperstimulation
• Ectopic pregnancy
• Ethical concerns

High-Yield One-Liners

1. IVF = Fertilization outside body.
2. Test tube baby programme = IVF-ET.
3. ZIFT = Zygote or embryo up to 8 blastomeres transferred into fallopian tube.
4. IUT = Embryo with more than 8 blastomeres transferred into uterus.
5. GIFT = Transfer of gametes into fallopian tube.
6. GIFT requires at least one normal fallopian tube.
7. ICSI is useful in severe male infertility.
8. Artificial insemination introduces semen artificially into female tract.
9. IUI = Processed sperms directly introduced into uterus.
10. ART = Handling of gametes and/or embryos outside the body to achieve pregnancy.
11. First IVF baby in the world: Louise Brown
12. First IVF baby in India: Kanupriya Agarwal

Last-Minute Revision Table

Technique	What is Transferred?	Site of Transfer	Fertilization Occurs
IVF	Embryo	Uterus	Outside body
ZIFT	Zygote/Early embryo	Fallopian tube	Outside body
IUT	>8 blastomere embryo	Uterus	Outside body
GIFT	Ovum + sperm	Fallopian tube	Inside body
ICSI	Single sperm injected into ovum	Laboratory	Assisted fertilization
IUI	Sperms	Uterus	Inside body

Memory Trick

GIFT → Gametes Go In Fallopian Tube

ZIFT → Zygote Into Fallopian Tube

IUT → Embryo Into Uterus

ICSI → Inject Sperm Into Egg

IVF → Fertilization In Vitro (Lab)

These five statements alone can solve most MCQs on infertility and ART.