Egg freezing, without the marketing

Egg freezing is a real technology that works, and it is marketed with a confidence the outcome data does not support. Both of those things are true, and the gap between them is where a lot of expensive disappointment happens.

What actually happens

Two weeks of daily injectable hormones to stimulate multiple follicles instead of the usual one, monitored by ultrasound and blood tests. A trigger injection, then egg collection under sedation — a transvaginal procedure lasting around 20 minutes. Mature eggs are vitrified, a fast-freezing method that dramatically improved survival rates compared with older slow-freeze techniques.

Later, eggs are thawed, fertilised by ICSI, cultured, and transferred as embryos.

Attrition happens at every step. Not all collected eggs are mature. Not all mature eggs survive thawing. Not all survivors fertilise. Not all fertilised eggs become viable blastocysts. Not all transferred embryos implant.

The numbers that matter

Two variables dominate: your age when you freeze, and how many mature eggs you bank.

Age matters because it determines the proportion of eggs that are chromosomally normal. A 30-year-old's eggs are more likely to produce a viable embryo than a 38-year-old's, and freezing does not change that — the eggs stay the age they were when frozen, which is the entire point of the technology.

Number matters because of the attrition chain. Modelling studies consistently find that meaningful cumulative live birth probability requires banking a substantial number of mature eggs — commonly cited as somewhere in the region of 15 to 20 for someone freezing in their early thirties, and considerably more for someone freezing later.

The practical consequence: most people need more than one cycle. A single cycle yielding eight eggs at 37 is not a strong insurance policy, and it is often sold as one.

Real-world outcome data is still thinner than it should be, because the majority of frozen eggs have not yet been used. Clinics quoting success rates should be asked whether those are per-egg survival, per-embryo transfer, or cumulative live birth per patient — they are very different numbers.

What it costs

Per cycle, typically several thousand pounds or dollars, plus medication, plus annual storage fees, plus the later cost of thawing, fertilising and transferring — which is essentially an IVF cycle and is frequently not included in the headline price.

Ask for the total cost of the realistic pathway, not the cost of one collection.

Who it makes most sense for

• People in their late twenties to early thirties who have a clear reason to delay and can afford multiple cycles. The odds are best and the number of cycles needed is lowest.
• People facing medical treatment that will damage ovarian function — chemotherapy, radiotherapy, certain surgeries. Here it is unambiguously worthwhile, and it is often funded.
• People with a family history of early menopause or primary ovarian insufficiency.

It makes least sense as a reassurance purchase at 39 after a single AMH result, which is a common pattern. What AMH actually tells you explains why that test is not the trigger it is often treated as — it predicts how many eggs a cycle will yield, which is genuinely relevant here, but it says nothing about egg quality.

Risks and the physical experience

Ovarian hyperstimulation syndrome is the main risk, mostly mild, occasionally serious, and less common with modern protocols and trigger choices. The collection carries small risks of bleeding and infection.

The two weeks of stimulation are physically demanding for many people — bloating, mood effects, fatigue — and often done alongside a full-time job with no acknowledgement that anything is happening. That is worth planning for rather than discovering.

The questions to ask a clinic

• How many mature eggs do you expect to collect for someone of my age and AMH?
• How many cycles would you recommend to reach a realistic target?
• What is your egg survival rate after thaw, and your fertilisation rate?
• What is the total cost including storage and eventual use?
• How many patients have returned to use eggs frozen here, and what happened?

That last question is the most revealing and the least often answered.

The alternative framing

Egg freezing is one option for managing reproductive timing, and it is the most expensive and most medicalised one. The others include getting a clear picture of your own reproductive function now, addressing anything treatable — thyroid, PCOS, endometriosis — and being realistic about timelines rather than deferring the question. How long conception actually takes has the base rates.

Knowing whether you ovulate reliably, how your cycles are behaving, and how that is trending over years is genuinely informative and costs nothing. Naked is built to track exactly that — cycle patterns, ovulation signals and symptoms over the long run — which is more useful for making this decision than a single hormone level, and is also the record a clinic will want if you do proceed.

The technology is real. Go in with the actual numbers.