To ask Her Majesty's Government, further to the Written Answer by Lord Prior of Brampton on 22 November 2016 (HL3075), how many human embryos were transferred to uteri in order to establish pregnancies following (1) vitrification, and (2) slow freezing methods; how many human embryos were deliberately destroyed following (a) vitrification, and (b) slow freezing methods, in the last five years for which figures are available; and how many human embryos held in storage have been allocated for potential destruction, but have not yet been deliberately destroyed, in the last five years for which figures are available, following either (i) vitrification, or (ii) slow freezing methods.
Answered on
24 October 2017
The Human Fertilisation and Embryology Authority has advised that it does not hold information on the method of freezing.