Egg freezing

Egg freezing is one way of women preserving their fertility so they can have children at a later date. If you decide to preserve your fertility, it’s best to do it as soon as you can and more effective before a woman is 35 years old.

What to expect

The egg freezing process takes two to three weeks. Once you decide to proceed with egg freezing, we will offer you screening tests for HIV and hepatitis B and C. You will also need to give written consent for your eggs to be stored and specify what you would like to happen to your eggs if for some reason you are no longer able to make decisions about your healthcare. We will store your eggs for 10 years.

Treatment starts with drugs used to block the hormones that your pituitary gland produces during your monthly cycle. This helps control when your eggs are released. We will also offer you different drugs to stimulate your ovaries to release more than one egg in your cycle.

We will use vaginal ultrasound scans to monitor your eggs and use blood tests to chart your levels of estrogen. Once they reach the optimum level, we’ll give you another injection to help your eggs mature. 34 to 38 hours later, we will collect your eggs.

There are two methods we can use to collect your eggs. Using a vaginal ultrasound, the doctor will insert a hollow needle through your vagina into each ovary to collect each egg sack. You will be sedated with either a general anaesthetic or a medication that makes you drowsy. This procedure takes about 30 minutes.

Wolfson Fertility Clinic patient:

“A big thank you to the whole team for helping us so we can hold our precious daughter today.”

Alternatively, we can use laparoscopy to collect your eggs. While you are under general anaesthetic, the doctor will make a small cut just below your navel and insert a small telescope with a light attached to it (a laparoscope). A hollow needle is then inserted to retrieve your eggs. You will need to rest for a day or two following the procedure.

Your eggs will be frozen using a process called vitrification. We will place the eggs into liquid nitrogen under carefully controlled conditions.
When you decide to use your eggs, we will thaw them and use them in the treatment of your choice. If you have eggs left over after treatment, you can choose to keep them, donate them or discard them.

Success rates

We estimate that there is approximately a 6% chance of pregnancy per egg frozen in women <35 years old. Therefore, the more eggs that are frozen, the higher the chances of success.


There is some evidence that miscarriage rates are higher in pregnancies from thawed frozen eggs. However, only around 2,000 babies have been born worldwide from frozen eggs, so studies of pregnancies resulting from frozen eggs are still limited.

As you age, the risk of pregnancy-related complications and health problems increases, whether or not you are using frozen eggs.

Visit HFEA to learn more about egg freezing.

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