Question
To ask His Majesty's Government, further to the Written Answers by Earl Howe on 15 July 2013 (HL1303) and by Lord Markham on 6 June 2023 (HL7725) and 27 June 2023 (HL8708), whether the implantation failure rate to date for pronuclear transfer is therefore entirely explicable on the basis of maternal age; or if not, what is the most plausible explanation for deviation from prior expectations.
Answer
The Human Fertilisation and Embryology Authority has advised that it has not made an assessment to date of the implantation failure rate for pronuclear transfer on the basis of maternal age, as the number to date is too low.