Egg Freezing: Preserving Fertility for the Future

Oocyte cryopreservation — egg freezing — is one of the most important advances in reproductive medicine over the past two decades. A woman's age is no longer an inevitable barrier to motherhood; by freezing eggs at the right age, she can preserve her reproductive potential for years to come. The introduction of vitrification (ultra-rapid freezing) has dramatically improved success rates, leading the American Society for Reproductive Medicine (ASRM) to remove egg freezing's "experimental" label in 2012.

What is egg freezing?

Egg freezing is a medical procedure in which:

1. The ovaries are hormonally stimulated to produce multiple mature eggs

2. Eggs are retrieved under light sedation in a simple outpatient procedure

3. Mature eggs are immediately frozen using vitrification

4. They are stored in liquid nitrogen at –196°C

5. Eggs are thawed and fertilised later when pregnancy is desired

Frozen eggs can be preserved for many years without meaningful loss of quality. International ESHRE guidance allows storage for 10 years, with possible extension.

Vitrification: a revolution in egg preservation

Before 2010, slow freezing damaged a large proportion of eggs through ice crystal formation. Vitrification — ultra-rapid freezing — transformed the field:

• Survival rate after thawing: 85–95%
• Excellent preservation of biological quality
• Fertilisation rates similar to fresh eggs
• Pregnancy rates very close to those of fresh eggs

Who benefits from egg freezing?

Medical egg freezing

• Patients before chemotherapy or radiotherapy
• Women with autoimmune conditions requiring fertility-affecting treatments
• Strong family history of premature ovarian insufficiency
• Before extensive ovarian surgery (such as severe endometriosis resection)
• Diagnosis of Turner syndrome (when retrieved at the right time)
• Genetic disorders associated with reduced ovarian reserve

Elective (social) egg freezing

• Delaying childbearing for career or educational reasons
• Not having found the right partner yet
• Achieving financial and personal stability before parenthood
• Wanting to maximise pregnancy chances at a later age

Best age for freezing

The age at freezing is the single most important factor in future success:

• Before 30: excellent outcomes, more eggs and higher quality
• 30–34: very good outcomes, often the ideal window
• 35–37: good outcomes, efficiency declines gradually
• 38–40: reasonable outcomes but requires more eggs
• After 40: significant decline in quality, often requiring multiple stimulation cycles

ASRM considers ages 32–37 the ideal window — balancing egg quality with clarity about whether the procedure is needed.

How many eggs are needed?

Numbers depend on age:

• Before 35: 15–20 mature eggs offer a 70–85% chance of a future live birth
• 35–37: 20–25 eggs
• 38–40: 30 or more eggs
• After 40: up to 40 eggs may be needed for similar rates

A typical stimulation cycle retrieves 10–20 eggs. Most women therefore need 1–3 cycles to reach the target.

Step-by-step process

Step 1: Assessment (1–2 weeks)

• AMH test to measure ovarian reserve
• Antral follicle count (AFC) by ultrasound
• Hormone tests (FSH, LH, estradiol)
• General tests (blood, infectious diseases)

Step 2: Ovarian stimulation (10–14 days)

• Daily gonadotropin injections (FSH or FSH+LH)
• Ultrasound monitoring every 2–3 days
• Blood tests for estradiol levels
• Modern antagonist protocols have reduced hyperstimulation rates to under 1%

Step 3: Trigger injection

hCG or GnRH agonist injection to complete egg maturation, given 34–36 hours before retrieval.

Step 4: Egg retrieval

• Simple procedure under light sedation
• Lasts 15–20 minutes
• Performed transvaginally with a fine needle under ultrasound guidance
• Patient returns home within hours

Step 5: Freezing

• Eggs are examined and only mature ones are selected (about 70–80%)
• Frozen by vitrification within hours of retrieval
• Stored in liquid nitrogen tanks at –196°C
• Flexible long-term preservation

Success rates when used later

Success rates depend on age at freezing, the number of eggs frozen, and sperm quality at the time of use:

• Egg survival after thawing: 85–95%
• Fertilisation rate after ICSI: 70–80%
• Reaching blastocyst stage (day 5): 40–50% of fertilised eggs
• Pregnancy rate per transfer: 30–50%
• Cumulative live birth rate from 15–20 frozen eggs (under 35): 70–85%

Procedure risks

Egg freezing is a relatively safe procedure, but it shares the same risks as any IVF cycle:

• Ovarian hyperstimulation syndrome (OHSS): rare with modern protocols (less than 1%)
• Mild sedation risks: very rare
• Minor bleeding or infection after retrieval
• Bloating and discomfort for a few days
• Hormonal mood effects (variable by individual)

Preparation

• Balanced diet
• Supplements: folate, vitamin D, CoQ10 (300–600 mg)
• Moderate exercise
• Stop smoking and alcohol
• Adequate sleep
• Weight optimisation (BMI 19–25 ideal)
• Avoid excessive stress

Ethical and legal considerations

In Saudi Arabia, egg freezing is permitted for married women for medical reasons and selected social indications under the regulatory framework of the Saudi Commission for Health Specialties. Elective freezing requires extended counselling and, in some contexts, spousal consent for future use. Confirm current regulatory details at your clinic.

When to consider freezing

• If you plan to delay childbearing past 30
• Family history of premature menopause
• Before any medical treatment that may affect fertility
• After diagnosis of a condition affecting the ovaries
• In your early thirties when childbearing plans are uncertain

Frequently asked questions

How long does the whole process take?

From the start of assessment to the end of retrieval and freezing: 4–6 weeks.

Does egg freezing reduce ovarian reserve?

No. The procedure does not use additional eggs from your overall reserve — it only uses eggs that would otherwise have been lost in that natural cycle.

Is there a time limit for using frozen eggs?

Per ESHRE international guidance, eggs can be stored for 10 years, with possible extension. Use is recommended at an age that still allows for safe pregnancy (typically before 50).

Do frozen eggs produce healthy children?

Yes. Long-term studies have shown no increase in birth defects or health problems compared with fresh-egg children.

How much does egg freezing cost?

Cost varies by centre and number of cycles, and typically includes assessment, medication, retrieval, freezing, and annual storage. Discuss your case with the clinic for specific cost details.

Sources

• American Society for Reproductive Medicine (ASRM). Fertility preservation and reproduction in cancer patients.
• European Society of Human Reproduction and Embryology (ESHRE). Guidelines on fertility preservation.
• National Institute for Health and Care Excellence (NICE). Guidance on egg freezing.
• Human Fertilisation and Embryology Authority (HFEA). UK statistics on egg freezing.
• American College of Obstetricians and Gynecologists (ACOG). Committee Opinion on Elective Egg Freezing.
• Human Reproduction Journal. Long-term outcomes of vitrified oocytes.

Medical disclaimer

This article provides general medical information for educational purposes only. It is not a substitute for personal medical advice, diagnosis, or treatment from a qualified healthcare professional. Every patient's situation is different, and egg freezing is an important personal decision. Please consult Dr. Haytham Ibrahim to discuss the medical and personal aspects of the decision.