Assisted Hatching

An early embryo is surrounded by a protective outer layer known as the zona pellucida. Before implantation can occur, the embryo must naturally emerge or "hatch" from this layer.
Assisted hatching is a laboratory technique in which a small opening or thinning is created in the embryo's outer layer before embryo transfer.
It is an optional IVF laboratory procedure and should not be used routinely for every patient. Current professional guidance does not show a clear improvement in live-birth rates for routine assisted hatching in fresh ART cycles, and evidence remains insufficient for several other patient groups.

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When May Assisted Hatching Be Discussed?
- Previous unsuccessful embryo transfers
- Embryos with an unusually thick outer layer
- Certain frozen-embryo-transfer situations
- Specific embryo or laboratory findings
- Another individually identified indication
Patient age alone should not be used as the only reason to recommend the procedure.

How Is Assisted Hatching Performed?
After fertilisation and during embryo development, the embryologist uses specialised laboratory equipment to create a controlled opening or thinning in the zona pellucida.
Methods may include:
- Laser-assisted hatching
- Mechanical techniques
- Other validated laboratory methods
The embryo is then returned to controlled culture conditions until transfer or further assessment.

Possible Limitations and Risks
- Accidental embryo damage
- No improvement in implantation
- Additional treatment cost
- A possible association with identical twinning
- Cancellation when the embryo is unsuitable
The procedure should be performed only by appropriately trained embryology professionals after discussing expected benefits, uncertainties and risks.