Frozen Embryo Transfer Cycles
Clinical Pregnancy Results 2021
Patients’ own eggs
Our 2021 results for frozen embryo transfer cycles have not yet been validated by the HFEA, but we like to keep you informed of our current success rates. In 2021, 187 frozen embryo transfer (FET) cycles using the patients’ own eggs resulted in an embryo transfer. The following table only includes patients using their own eggs. No surrogacy cases are included.
The success of frozen embryo transfers may depend more on the age of the patient at embryo freezing than their age at embryo transfer, therefore the results have been broken down into age categories for their age at freeze.
| 2021, patients’ own eggs | |||
| Age at freeze | Clinical pregnancy events per treatment cycle started | Clinical pregnancy events per embryo transfer | Foetal hearts per embryo transferred |
| All ages | 66/188
(35.1%) |
66/187
(35.3%) |
68/197
(34.5%) 64 singletons, 2 twins |
| <35 | 53/130
(40.8%) |
53/129
(41.1%) |
54/135
(40%) 52 singletons, 1 twin |
| 35-37 | 7/37
(18.9%) |
7/37
(18.9%) |
8/39
(20.5%) 6 singletons, 1 twin |
| 38-39 | 5/13
(38.5%) |
5/13
(38.5%) |
5/14
(35.7%) 5 singletons |
| ≥40 | 1/8
(12.5%) |
1/8
(12.5%) |
1/9
(11.1%) 1 singleton |
Frozen treatment cycles – Live Birth Results 2020 (full calendar year)
In 2020, 125 frozen embryo treatment cycles using the patients’ own eggs resulted in an embryo transfer. As this is the most recent data the results have not yet been validated by the HFEA, but we like to keep you informed of our current success rates. The following table only includes patients using their own eggs. No surrogacy cases are included.
The success of frozen embryo transfers may depend more on the age of the patient at embryo freezing than their age at embryo transfer, therefore the results have been broken down into age categories for the patients’ age at freeze.
| 2020, patients’ own eggs | |||
| Age | Live birth events per treatment cycle started | Live birth events per embryo transfer | Live births per embryo transferred |
| All ages | 25/131
(19.1%) |
25/125
(20.0%) |
26/129
(20.2%) 25 singletons, 1 twin |
| <35 | 20/96
(20.8%) |
20/92
(21.7%) |
20/93
(21.5%) 20 singletons |
| 35-37 | 5/25
(20.0%) |
5/24
(20.8%) |
6/25
(24.0%) 5 singletons, 1 twin |
| 38-39 | 0/5
(0%) |
0/5
(0%) |
0/6
(0%) |
| ≥40 | 0/5
(0%) |
0/4
(0%) |
0/5
(0%) |
Frozen embryo transfer cycles – HFEA validated
Patients’ own eggs
The below table shows the live births per embryo transferred for patients undergoing frozen embryo transfer from January 2016 to December 2018 using their own eggs. The data provided here is for three years due to smaller patient numbers. These results have been validated by the HFEA.
| 2016-2018, patients’ own eggs, frozen embryo transfers | |||
| Age | Live births per embryo transferred | Comments | |
| Clinic results | National average | ||
| All ages | 105/381
(28%) |
24% |
Consistent with national average |
| Under 35 | 78/260
(30%) |
28% |
Consistent with national average |
| 35-37 | 18/80
(23%) |
24% |
Consistent with national average |
| 38-39 | – | 18% | Too few patients to provide accurate data |
| 40-42 | – | 12% | Too few patients to provide accurate data |
| 43-44 | 0 | 5% | None performed within date range |
| Over 44 | 0 | 3% | None performed within date range |
Donated eggs
Some patients who create embryos with donor eggs may have embryos frozen and use later in a frozen embryo transfer cycle. Clinical pregnancy rates and live birth rates for 2016-2018 are shown below. Please note these results are for a 3-year period due to smaller patient numbers. These results have been validated by the HFEA.
| 2016-2018, donated eggs, all ages | Results | National Average | Comments |
| Clinical pregnancy per cycle | 10/25
(40%) |
37% |
Consistent with national average |
| Live Birth per cycle | 9/25
(36%) |
32% |
Consistent with national average |
| Clinical pregnancy per embryo transferred | 10/30
(33%) |
31% |
Consistent with national average |
| Live birth per embryo transferred | 9/30
(30%) |
27% |
Consistent with national average |
Page Last Modified: 23rd September 2024