Reviewed by: Dr. Priyadatt Patel, Senior Gynecologist · Advanced Laparoscopic Surgeon · IVF and Endometriosis Programme Lead. Last updated: 26 May 2026.
Advanced ART · Assisted Hatching
Assisted Hatching
Assisted hatching is a laboratory technique that creates a small opening in the zona pellucida (outer shell) of the embryo to facilitate hatching and implantation in selected cases.
When assisted hatching may help
Indications
- Frozen-thawed embryo transfer (zona may harden post-freeze)
- Advanced maternal age (≥38)
- Two or more failed IVF cycles
- Embryos with thick or abnormal zona on assessment
How it is performed
Laser vs chemical thinning
Modern assisted hatching uses precise laser micromanipulation to create a small opening or thin a region of the zona pellucida. Older chemical methods are largely obsolete.
Evidence
What the data shows
Meta-analyses suggest assisted hatching modestly improves implantation rates in selected populations (especially older patients with prior failures). Routine use in good-prognosis younger patients is not supported.
Common questions
Frequently asked
Does assisted hatching damage the embryo?
Modern laser techniques are precise and atraumatic when performed by experienced embryologists. Risk to the embryo is minimal.
Should all patients have assisted hatching?
No. Routine use is not evidence-based. Selective use in older patients, frozen-thawed embryos, or after repeated failures is appropriate.
How is the decision to use assisted hatching made?
Through joint clinician-embryologist assessment considering patient age, history, embryo characteristics, and prior cycle outcomes.
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Dr. Priyadatt Patel
Senior Gynecologist · Advanced Laparoscopic Surgeon · IVF and Endometriosis Programme Lead
MS OBGyn · Pregnancy Care · Advanced Gynaecological Ultrasound · Fertility Preservation
ESHRE / ESGE / AAGL / ASRM guideline-aligned practice. 3D Karl Storz precision technique. Fertility-preservation-first philosophy. Evidence-based decisions, honest counselling, long-term outcomes orientation.
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