Assisted hatching
An IVF 'add-on' in which the laboratory thins or makes a small opening in the shell around an embryo, in the hope of helping it implant — though there is no good evidence this improves the chance of a baby.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Assisted hatching thins or opens the shell around an IVF embryo to try to help it implant.
- The HFEA rates it grey: there is not enough good evidence that it improves the chance of having a baby for most patients, and NICE does not recommend it.
- It is an add-on, usually for an extra fee, and the embryo can occasionally be damaged during the procedure.
- You should not be pressured to pay for it. Ask why it is being offered for you and check the HFEA add-ons ratings.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your specialist will give you advice for your situation.
In theory, may make it easier for an embryo to hatch and implant — but this benefit is not proven for most patients.
Most patients, because good-quality evidence does not show it improves the chance of a baby.
Embryos are grown in the lab; the hatching step is done by the embryologist without involving you.
A clear record of whether the technique was used and why.
Embryos are grown in the lab; the hatching step is done by the embryologist without involving you.
A treated embryo is transferred in the usual way; your experience is the same as standard IVF.
You wait the usual time before a pregnancy test, as in any IVF cycle.
The outcome is your IVF cycle's outcome; assisted hatching does not change the timing of results.
What is assisted hatching?
Assisted hatching is an extra technique that can be added on to IVF or ICSI. Every embryo is surrounded by a shell-like layer called the zona pellucida. Normally the embryo has to break out of (hatch from) this shell before it can implant in the womb lining.
In assisted hatching, the laboratory uses a laser, acid or another tool to thin the shell or make a small hole in it, in the hope of making it easier for the embryo to hatch and implant.
The idea sounds logical, but the evidence does not back it up. The HFEA rates assisted hatching grey, meaning there is not enough good-quality evidence to say it improves the chance of having a baby for most patients. Current NICE guidance (NG257) recommends that assisted hatching is not offered, because it has not been shown to improve pregnancy rates.
It is offered as an add-on, often for an extra fee. For most people it is unlikely to help, and the embryo can occasionally be damaged by the procedure.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Options at a glance
These are the main approaches described in this guide. The right option depends on the diagnosis, your goals and what your clinician thinks is safe.
Laser assisted hatching
A focused laser is used to thin or make a small opening in the embryo's shell. The most common modern method.
Chemical (acidic) hatching
A mild acidic solution is briefly applied to thin or breach the shell. An older technique used less often now.
Mechanical or other methods
Physical methods to make an opening in the shell. Less commonly used.
Selective use claims
Some clinics suggest it for older patients, those with a thick shell, or after previous failed cycles or frozen embryos — but high-quality evidence does not support benefit...
Preparing for your treatment
- Ask the clinic to explain in writing why assisted hatching is being recommended for you specifically.
- Ask to see the HFEA traffic-light rating for assisted hatching and what it means.
- Ask what difference, if any, it would make to your chance of a baby, and on what evidence.
- Ask whether there is an extra charge, and whether that money might be better spent on standard treatment.
- Discuss the small chance that the procedure could damage the embryo.
- Be wary if it is added automatically to a package rather than discussed as a choice.
What happens
Assisted hatching is done entirely in the laboratory and does not involve any extra procedure for you. After your eggs are collected and fertilised, the embryos are grown in the lab as usual.
Before an embryo is transferred (or sometimes before freezing or thawing), an embryologist uses a laser, acid or another tool to thin the shell or make a small opening in it. The embryo is then transferred in the normal way.
Because it is a lab step, it does not change your appointments, your recovery or when you get your result. The outcome is the outcome of your IVF cycle.
Is this treatment right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- Most patients, because good-quality evidence does not show it improves the chance of a baby.
- Anyone being offered it automatically rather than for a clear, evidence-based reason.
- People for whom the small risk of embryo damage outweighs an unproven possible benefit.
- Those who would be better served putting resources into further standard cycles.
Delay or rearrange if…
- You have not had a clear explanation of why it is recommended for you.
- You have not been shown the HFEA rating or told about any charge.
- You feel pressured rather than fully informed.
- You are unwell or recovering from a complication of the stimulation cycle.
Alternatives to discuss
- Standard IVF or ICSI without assisted hatching.
- Spending resources on further standard treatment cycles rather than an add-on.
- Other clinically indicated steps discussed and evidenced with your specialist.
- No treatment, after discussion and counselling.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Benefits
- In theory, may make it easier for an embryo to hatch and implant — but this benefit is not proven for most patients.
- Some clinicians believe specific subgroups might benefit, though high-quality evidence does not confirm this.
- Does not add any physical procedure or recovery for you.
- Does not delay your treatment or change when you get your result.
Risks & complications
- Paying extra for a technique that, for most people, is unlikely to improve the chance of a baby
- False hope that an add-on will make the difference
- Damage to the embryo during the hatching procedure
- An embryo becoming less viable after the procedure
- Loss of an embryo that might otherwise have been transferred
- Theoretical concern about effects on the embryo, although no added risk to a resulting child is established
Assisted hatching carries no known extra risk to you as the patient, because it is done on the embryo in the laboratory. The main concerns are that it is unlikely to help for most people, that it can occasionally damage an embryo, and that it is sold as an extra. Ask your clinician what the evidence is for your situation and whether there is a charge.
Published figures to discuss
There are no robust patient-level complication rates to quote, because the technique is performed on the embryo in the laboratory and the key finding is the lack of proven benefit rather than a measurable harm rate. We therefore avoid giving misleading percentages.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Proven improvement in live birth | Not established for routine use | HFEA treats assisted hatching as an add-on with limited evidence; patients should ask for clinic-specific justification rather than accepting it as standard. | Guide sourcesClinical context |
| Direct physical risk to the patient | No additional procedure on the patient | The technique is performed on the embryo in the laboratory, so the main issue is benefit, cost and embryo handling rather than bodily harm. | HFEA — Assisted hatching (rating and evidence)hfea.gov.ukSource-linked context |
| Embryo damage or loss | Theoretical/recognised laboratory concern | Clinics should explain how often they use it, in whom, and whether they audit outcomes. | Guide sourcesClinical context |
| Marketing overclaim | Common add-on risk | Claims that it routinely boosts success are not supported by strong evidence for most patients. | HFEA — Assisted hatching (rating and evidence)hfea.gov.ukSource-linked context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
There is no physical recovery from assisted hatching, because it is done on the embryo in the laboratory rather than on you. Afterwards, your IVF cycle continues exactly as it would otherwise.
- No physical changes from the technique itself
- The usual feelings and waiting of any IVF cycle
- No change to your appointments or activity
Aftercare
- Follow the standard aftercare for your IVF or frozen embryo transfer cycle.
- Ask your clinic to record whether assisted hatching was used and why.
- Discuss honestly whether the add-on made sense for you, especially before paying for it again.
- Keep a written copy of what you were charged for.
- Ask what the plan is if the cycle does not lead to a pregnancy.
- Written reason assisted hatching was recommended for you
- Confirmation of any extra charge before you agree
- A note of the HFEA rating you were shown
- Standard IVF/frozen-transfer aftercare instructions
- The clinic's contact for questions
⚠ Get urgent help if…
- Severe abdominal pain, bloating, breathlessness or reduced urine after egg collection (possible OHSS) — seek urgent advice
- Heavy vaginal bleeding after egg collection or transfer
- Fever or feeling generally unwell after any procedure
- Severe or one-sided pain, shoulder-tip pain or feeling faint in early pregnancy (possible ectopic) — seek urgent help
- Feeling pressured to pay for add-ons you do not understand — pause and ask for the evidence
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your specialist gives you.
Results & realistic expectations
Assisted hatching does not produce a result of its own. The result is whether your IVF or frozen embryo transfer cycle leads to a pregnancy, and that depends mainly on factors such as age, egg and sperm quality and the womb lining — not on the hatching step. A good clinic will be honest that, for most patients, assisted hatching is not expected to change the outcome.
Related tests, treatments or support
Assisted hatching is only done as part of an IVF or ICSI cycle. It should not be bundled in with other unproven add-ons as a matter of routine; each add-on should be justified separately on its own evidence.
Follow-up & long-term care
Follow-up is the same as for your IVF or frozen embryo transfer cycle: a pregnancy test after the two-week wait, and a discussion of next steps and the plan if the cycle is not successful.
Repeat, follow-on and what comes next
- Assisted hatching does not change the chance that a cycle may fail and need repeating.
- If a cycle is unsuccessful, the decision is about the whole treatment plan, not the hatching step alone.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- A clear record of whether the technique was used and why.
- Honest discussion that, for most patients, it is not expected to change the outcome.
- Standard, well-explained IVF or frozen-transfer aftercare.
- A named contact and a plan if the cycle is unsuccessful.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- Whether the clinic charges separately for the technique or bundles it into a package
- The cost of the IVF or ICSI cycle it is added to
- Whether a laser or other method is used
- Number of embryos treated
- Whether it is offered for fresh or frozen transfers
- Whether assisted hatching is an extra charge and how much
- The evidence the clinic relies on for offering it to you
- Confirmation it is not being added automatically without discussion
- What the underlying IVF/frozen-transfer cycle costs
- Cancellation policy and what is refunded if the cycle stops early
On the NHS? Assisted hatching is not routinely offered or funded by the NHS, and NICE does not recommend it; it is usually sold privately as an add-on. NICE guidance (NG257) sets the clinical recommendations for England, while Scotland, Wales and Northern Ireland each have their own NHS/HSC fertility rules that can differ and change over time. If you are unsure what is available to you, ask your NHS/HSC fertility commissioner or clinic to confirm the current position rather than relying on NICE guidance alone.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Offering it as a routine part of a package without discussing the weak evidence.
- Not showing the HFEA grey rating or mentioning NICE's position.
- Implying it will make the difference between success and failure.
- Charging extra for an unproven add-on without offering better-value alternatives.
Marketing red flags
- Claiming assisted hatching 'boosts implantation' as if proven.
- Targeting older patients or those with failed cycles with strong claims.
- Bundling it automatically into every IVF cycle.
- Not mentioning that NICE does not recommend it.
Choosing a specialist safely
- Check the specialist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good specialist will welcome every one of these.
- Why are you recommending assisted hatching for me specifically?
- What is the HFEA traffic-light rating, and what evidence is there that it would help me?
- Is there an extra charge, and would that money be better spent on standard treatment?
- What is the chance the procedure could damage my embryo?
- Will you record clearly whether it was used, and review whether it made sense for me?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the specialist who carries out my treatment, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this treatment not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Does assisted hatching improve my chance of having a baby?
Why is it being offered to me then?
Is it available on the NHS?
Could it harm my embryo?
Should I pay extra for it?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: HFEA — Assisted hatching (rating and evidence) HFEA — Treatment add-ons and the traffic-light system NICE NG257 — Procedures used during IVF (assisted hatching) HFEA — Information and guidance on treatment add-ons for clinics HFEA — Improved ratings for fertility treatment add-ons (2023) NICE NG257 — Fertility problems: assessment and treatment NHS inform — Infertility and access to treatment (Scotland) NHS Wales — Specialist fertility services commissioning policy HSC Northern Ireland — Regional Fertility Centre
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
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