Egg freezing, medically known as oocyte cryopreservation, has moved from being primarily a fertility-preservation option for women undergoing cancer treatment to a procedure increasingly chosen for personal, professional and reproductive reasons.

For some women, the decision is linked to career plans, delayed marriage, financial considerations or uncertainty about future relationships. For others, it is a medical necessity because a condition or treatment could damage their fertility.

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However, it is important to understand that freezing eggs does not freeze a woman’s fertility indefinitely. It preserves the eggs that are available at the time they are retrieved. The quality and number of eggs a woman has generally decline with age.

Why Are Women Freezing Their Eggs?

There are two broad reasons for egg freezing.

1. Medical fertility preservation

A woman may freeze her eggs before undergoing treatment that could damage the ovaries, including certain forms of chemotherapy or radiotherapy.

It may also be considered before some surgeries or medical conditions that could affect ovarian function.

2. Elective or social egg freezing

Some women who are not ready to have children may choose to preserve their younger eggs for possible use later.

Reasons can include:

• Not having a suitable partner
• Career or educational plans
• Financial considerations
• Wanting to delay motherhood
• Personal circumstances
• Concerns about declining fertility with age

But egg freezing should not be viewed as a guarantee that a woman will have a baby later.

Why Does Age Matter So Much?

The most important factor is the age at which the eggs are frozen, rather than simply the age at which they are eventually used.

Women are born with a finite number of eggs. As they grow older, both the number and quality of their eggs generally decline.

The decline becomes more significant as women approach their late 30s and 40s. Older eggs are also more likely to have chromosomal abnormalities, which can reduce the likelihood of successful fertilisation, embryo development and pregnancy.

This is why fertility specialists generally encourage women considering elective egg freezing to discuss it before the mid-30s, although there is no single age that is appropriate for everyone.

Importantly, a woman in her 30s should not assume that freezing eggs automatically means she will need them later. She may eventually conceive naturally.

How Does Egg Freezing Actually Work?

The process usually involves several stages.

Step 1: Fertility assessment

Before treatment begins, doctors normally assess ovarian reserve and overall reproductive health.

Tests may include blood tests and ultrasound examinations. These help doctors estimate how the ovaries might respond to stimulation.

Step 2: Hormonal stimulation

The woman receives hormone injections for approximately 10–14 days.

The purpose is to stimulate the ovaries to develop several mature follicles during one menstrual cycle rather than the usual single dominant egg.

The woman is monitored through ultrasound scans and sometimes blood tests during this period.

Step 3: Trigger injection

When the follicles have reached an appropriate stage of development, a final medication—often called a trigger injection—is administered to help the eggs complete maturation.

Egg retrieval is then scheduled at the appropriate time.

Step 4: Egg retrieval

Egg retrieval is generally performed using a thin needle guided by ultrasound through the vagina into the ovaries.

The procedure usually takes around 15–30 minutes, although the exact duration varies.

Sedation or anaesthesia is commonly used, so the patient generally does not experience significant pain during the procedure.

Step 5: Vitrification

The mature eggs are rapidly frozen using a technique called vitrification.

The eggs are stored in liquid nitrogen at approximately -196°C.

At that temperature, biological activity essentially stops, allowing the eggs to remain preserved for future use according to applicable medical and legal requirements.

What Happens When the Woman Wants to Use the Eggs?

Freezing the eggs is only the first stage.

When the woman decides to attempt pregnancy using the stored eggs, they are thawed.

The eggs that survive thawing are usually fertilised with sperm through a specialised IVF technique called intracytoplasmic sperm injection (ICSI).

With ICSI, a single sperm is injected directly into an egg.

If fertilisation occurs, the resulting embryo is cultured in the laboratory for several days before an embryo may be transferred into the uterus.

Therefore, the journey is:

Egg retrieval → freezing → storage → thawing → fertilisation → embryo development → embryo transfer → pregnancy.

Not every egg survives every stage.

Does Every Frozen Egg Survive?

No.

This is one of the most important things women need to understand.

Some eggs may not survive the freezing and thawing process. Others may fail to fertilise. Some fertilised eggs may not develop into healthy embryos, and an embryo transfer does not always result in pregnancy.

Consequently, having 10 frozen eggs does not mean a woman has 10 chances to have a baby.

The probability of success depends on several factors, particularly:

• Age when the eggs were frozen
• Number of mature eggs retrieved
• Egg quality
• Sperm quality
• Laboratory performance
• Embryo development
• The woman’s health when pregnancy is attempted

How Many Eggs Should a Woman Freeze?

There is no universal number that guarantees a future baby.

A younger woman may obtain more usable eggs from a cycle than an older woman, but ovarian response varies considerably between individuals.

Some women may need more than one stimulation and retrieval cycle to obtain an adequate number of mature eggs.

This is why fertility specialists generally discuss the woman’s age, ovarian reserve and reproductive plans before recommending a target number.

Can Egg Freezing Guarantee a Baby Later?

No.

This is perhaps the biggest misconception surrounding egg freezing.

Egg freezing is better described as a fertility-preservation strategy or opportunity, not an insurance policy that guarantees motherhood.

A woman could freeze eggs at a relatively young age and still fail to achieve a pregnancy when she eventually uses them.

At the same time, many women do successfully use previously frozen eggs to achieve pregnancy.

The important point is that the technology improves reproductive options; it does not eliminate biological uncertainty.

Are There Side Effects?

Most women tolerate ovarian stimulation and egg retrieval without serious complications, but side effects can occur.

Common temporary effects may include:

• Abdominal bloating
• Pelvic discomfort
• Breast tenderness
• Mood changes
• Headaches
• Fatigue
• Mild pain following egg retrieval

A less common but potentially serious complication is ovarian hyperstimulation syndrome (OHSS).

Severe OHSS can cause significant fluid shifts, abdominal swelling, breathing difficulties and other complications and requires medical attention.

Egg retrieval itself can also rarely cause bleeding, infection or injury to surrounding structures.

Therefore, egg freezing should be undertaken under the supervision of qualified fertility specialists.

How Much Does Egg Freezing Cost in Nigeria?

The cost varies considerably between fertility centres and depends on what is included in the package.

Expenses may include:

• Initial fertility assessment
• Blood tests
• Ultrasound scans
• Stimulation medications
• Egg retrieval
• Anaesthesia or sedation
• Laboratory processing
• Freezing
• Storage
• Future thawing
• ICSI/IVF
• Embryo transfer
• Pregnancy-related treatment

Dr Olakunle Olawole Oloko, quoted in the material provided, said his centre charges approximately ₦550,000 per quarter for storage.

That means women considering the procedure should not look only at the initial egg-freezing bill. Long-term storage and eventual IVF treatment can significantly increase the overall cost.

What Happens to Eggs That Are Never Used?

A woman can decide what happens to her stored eggs, subject to the clinic’s consent procedures and applicable laws.

Depending on the circumstances, options may include continued storage, disposal, or other legally permitted arrangements.

As Dr Oloko explained, a woman who later conceives naturally and decides that she no longer needs her frozen eggs may instruct the fertility centre to discard them.

What If a Woman Is Already in Her Late 30s or 40s?

Egg freezing can still be discussed, but expectations need to be realistic.

The older a woman is when eggs are retrieved, the greater the possibility that fewer eggs will be obtained and that a larger proportion may have chromosomal abnormalities.

This does not mean pregnancy is impossible.

Rather, it means a fertility specialist needs to assess the woman’s individual circumstances and explain the likely benefits and limitations.

For someone with diminished ovarian reserve or older eggs, doctors may discuss other options, depending on the individual’s circumstances, including IVF using donor eggs.

Egg Freezing Does Not Stop Menopause

Another important misconception is that freezing eggs preserves a woman’s fertility forever.

It does not.

Egg freezing preserves the eggs retrieved at that particular time. It does not stop the ovaries from ageing.

A woman can therefore have frozen eggs stored while her natural ovarian reserve continues to decline.

The frozen eggs retain characteristics associated with the age at which they were retrieved, but the woman’s uterus and overall health will still matter when she eventually attempts pregnancy.

What About Pregnancy at an Older Age?

Even if a woman freezes eggs when she is younger, pregnancy later in life can carry additional health considerations.

Pregnancy at an advanced maternal age can be associated with increased risks such as:

• High blood pressure during pregnancy
• Gestational diabetes
• Miscarriage
• Chromosomal abnormalities depending on the embryo/egg source
• Caesarean delivery
• Other pregnancy complications

Therefore, preserving younger eggs does not mean that all pregnancy-related risks associated with older maternal age disappear.

What Experts Want Women to Understand

The central message from fertility specialists is that timing matters.

A woman does not need to freeze her eggs simply because she has reached her 30s. Equally, someone who is considering delaying motherhood should not assume that she can wait indefinitely and freeze eggs later with exactly the same prospects.

The best approach is an individual fertility assessment and a conversation with a qualified reproductive endocrinologist or fertility specialist.

The Bottom Line

Egg freezing has given women an important additional reproductive option. It can preserve younger eggs for possible future use and may be particularly valuable for women facing fertility-threatening medical treatment.

But it is not a guarantee of motherhood.

The earlier the eggs are frozen—particularly before significant age-related decline—the better the potential prospects generally are. However, the number of eggs retrieved, their maturity and quality, laboratory performance, sperm quality and subsequent embryo development all influence the final outcome.

For Nigerian women considering the procedure, the decision should therefore involve medical advice, realistic expectations and careful financial planning, including the future costs of storage and IVF.

Editor’s note: Egg freezing is a medical procedure. Anyone considering it should consult a qualified fertility specialist rather than relying solely on information from celebrities, social media or news reports.