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Assisted Hatching

Assisted hatching  is an additional procedure that can be performed in patients who are undergoing in vitro fertilization (IVF)  treatment. The embryo is surrounded by a hard outer layer of cells called the zona pellucida. This outer layer of cells can be thought of as the “shell” of the embryo.  The embryo must “break-free” of this “shell” in order to implant in the uterus and develop into a pregnancy. Assisted hatching is a procedure where we can assist the embryo to “hatch” from its’ “shell” by creating a small perforation in the zona pellucida. It is believed that a perforated zona pellucida increases the chance the embryo will hatch and successfully implant.

In a natural pregnancy when the embryo reaches the blastocyst stage of development the zona begins to thin. The thinning process is facilitated by the repeated contraction and expansion of the blastocyst which alters the elasticity of the zona. Once the zona is sufficiently thinned it tears allowing the embryo to hatch. Embryos that do not hatch will not be able to implant.

How is Assisted Hatching performed?

The embryologist will use a targeted microscopic laser to create a very small hole (perforation) in the zona pellucida (outer shell of the embryo). It is generally performed on the day of embryo transfer.  Assisted hatching can also be done on previously cryopreserved (frozen & thawed) embryos.

LASER ASSITED HATCHING

Who should consider Assisted Hatching?

Assisted hatching may be considered in the following cases:
•    Previous failed IVF/ICSI cycles
•    Patients whose embryos have unusually thick zona pellucida
•    Patients whose embryos are not developing as well as expected 
•    Elevated FSH in the early follicular phase of the menstrual cycle
•    Older women tend to have a thicker outer shell surrounding the embryo
•    Poor embryo quality where self-hatching is not expected

Your doctor & embryologist can help you to determine if assisted hatching may be useful to you.
 

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