Question to the Department of Health and Social Care:

To ask His Majesty's Government, of the human eggs which were harvested and frozen by vitrification from 2014-24 for social purposes, how many (1) did not thaw satisfactorily or were considered unsuitable for an attempt at fertilisation, (2) of those thawed underwent attempts at fertilisation with or without intracytoplasmic sperm injection, and (3) of those fertilised produced viable embryos suitable for uterine transfer.

The information is not held in the format requested. The Human Fertilisation and Embryology Authority (HFEA) has advised that it does not hold information on the method of freezing for the whole period requested, the reasons the eggs were frozen, or how many eggs did not thaw satisfactorily or were considered unsuitable and how many of the eggs thawed underwent attempts at fertilisation. The following table shows the number eggs fertilised, the number of embryos created, and the number of embryos transferred from 2014 to 2023:

Data is as recorded by the HFEA on 17 December 2025 and reflects the data on this date and therefore may change over time.