Egg freezing preserves unfertilized eggs by flash-freezing them in liquid nitrogen, where they can be stored for years until you’re ready to use them. A single cycle nationally averages around $16,000 and involves about two weeks of hormone injections, a short outpatient retrieval procedure, and a recovery period of roughly one to two days. Here’s what each step actually looks like.
The Hormone Stimulation Phase
Your ovaries normally release one egg per menstrual cycle. Egg freezing aims to collect many eggs at once, so the process begins with daily hormone injections that push your ovaries to mature multiple eggs simultaneously. The key hormone is a gonadotropin, which directly stimulates the ovarian follicles (the small fluid-filled sacs where eggs develop). Alongside it, you’ll typically take two other types of medication: one that prevents your body from releasing the eggs too early, and another that triggers final maturation right before retrieval.
You’ll inject these hormones at home, usually in the abdomen or thigh, for roughly 8 to 14 days. During that window, you’ll visit the clinic every few days for blood draws and ultrasounds so your doctor can monitor how many follicles are growing and adjust your dosage. Once the follicles reach the right size, you’ll take a “trigger shot” that tells the eggs to complete their final stage of development. Retrieval is scheduled about 36 hours later.
What Happens During Egg Retrieval
The retrieval itself is a short procedure, typically lasting 15 to 30 minutes, performed under sedation. An ultrasound probe is inserted vaginally to locate the mature follicles on each ovary. A thin needle is then guided through the vaginal wall and into each follicle, and a gentle suction device draws the fluid and egg out through the needle. You won’t feel this while sedated, and most people go home the same day.
The number of eggs collected varies widely depending on age, ovarian reserve, and how your body responded to stimulation. A typical cycle might yield anywhere from 5 to 20 eggs, though some people get fewer and some get more.
How Vitrification Preserves the Eggs
Once collected, the eggs are frozen through a process called vitrification. This is the technical heart of modern egg freezing, and it’s the reason success rates have improved dramatically over the past decade. Vitrification replaces the water inside each egg cell with a protective fluid (a cryoprotectant), then flash-freezes the egg in liquid nitrogen. The speed is what matters: traditional slow-freezing allowed ice crystals to form inside the cell, which could rupture its delicate internal structures. Vitrification happens so fast that the cell essentially turns to glass, bypassing ice crystal formation entirely.
The eggs are then stored in liquid nitrogen tanks at roughly negative 196 degrees Celsius. At that temperature, all biological activity stops. There isn’t yet enough long-term data to confirm a maximum storage duration for frozen eggs, but embryos (which behave similarly) have produced successful pregnancies after more than 10 years of storage. The general expectation is that properly vitrified eggs remain viable indefinitely.
How Many Eggs You Need
Not every frozen egg will become a baby. Some won’t survive the thaw, some won’t fertilize, and some resulting embryos won’t implant. So the number of eggs you freeze matters a lot, and it depends heavily on your age at the time of freezing.
For people under 35, roughly 15 frozen eggs provide about a 90% chance of one live birth. For those aged 35 to 37, that number rises to around 20. After 37, the math gets steeper: achieving a 90% probability of one child requires more than 30 banked eggs in most scenarios, which often means going through two or more retrieval cycles. Even at a more modest 70% probability, older patients generally need significantly more eggs than younger ones because egg quality declines with age, affecting fertilization and embryo viability rates down the line.
Recovery After Retrieval
Most people feel well enough to return to normal activities the day after retrieval, though mild to moderate cramping and bloating are common. Some light vaginal bleeding can occur and typically slows within 48 hours. You’ll want to avoid strenuous exercise for several days and skip tampons, baths, and swimming for about a week to reduce infection risk. Showers are fine. Sexual intercourse isn’t restricted, though it may be uncomfortable for a few days.
Watch for symptoms that aren’t normal: persistent or worsening abdominal pain, fever, ongoing nausea or vomiting, diarrhea, or dark yellow urine. These could signal infection or ovarian hyperstimulation syndrome.
Risks to Be Aware Of
The most common medical risk is ovarian hyperstimulation syndrome (OHSS), where the ovaries overreact to the hormone medications. Mild OHSS, which causes bloating and abdominal discomfort, occurs in roughly 8 to 23% of stimulation cycles. It’s uncomfortable but resolves on its own within a few days. Moderate cases (1 to 7%) involve fluid buildup in the abdomen visible on ultrasound. Severe OHSS (0.25 to 5%) can cause significant fluid retention, breathing difficulties, and changes in kidney function, sometimes requiring hospitalization. Your doctor monitors for this throughout stimulation, and modern protocols have made severe cases less common.
Infection from the retrieval procedure is uncommon. The sedation itself carries the same small risks as any light anesthesia.
What It Costs
A single egg freezing cycle averages about $16,000 nationally. That breaks down to roughly $11,000 for the clinic procedure and about $5,000 for the fertility medications, which are billed separately through a specialty pharmacy. If you need multiple cycles to bank enough eggs, you’ll pay for each one. On top of that, annual storage fees run $500 to $1,000 per year for as long as your eggs remain frozen.
Some employers now cover egg freezing as a benefit, and a growing number of insurance plans include partial coverage for fertility preservation, particularly when it’s medically indicated (before cancer treatment, for example). It’s worth checking your specific plan before assuming you’ll pay entirely out of pocket.
When You’re Ready to Use Them
When you decide to use your frozen eggs, they’re warmed in the lab and fertilized with sperm through a process called intracytoplasmic sperm injection, where a single sperm is injected directly into each egg. This is standard for frozen eggs because the outer shell of the egg hardens slightly during vitrification, making traditional fertilization less reliable. The resulting embryos develop in the lab for several days before one is transferred to your uterus, following the same steps as a standard IVF cycle.
Survival rates for vitrified eggs during the thaw are generally above 90%, though fertilization and implantation rates still depend on egg quality at the time of freezing. This is why age at freezing is the single biggest factor in eventual success, not how long the eggs have been stored.