Success Rates

Whilst great advances have been made in assisted conception since the birth of the first IVF baby Louise Brown in 1978 and the pregnancy rates with treatment have risen, most patients must not expect a baby with every treatment.

All units are required to report their success rates with treatment to the Human Fertilisation & Embryology Authority (HFEA), and these figures can be very helpful for patients in assessing their chances and planning their treatment, caution has to be exercised when looking at these figures.

Many factors influence the success rates of IVF and ICSI treatments that are outside the control of clinics and clinicians. The most important of these factors is female age, the effects of which can be seen on the pregnancy rates of all treatments compiled by the HFEA. (see graph fig1 ) Other factors such as duration of infertility, previous pregnancies, cause of infertility, blood levels of hormones, male age and sperm quality, pelvic conditions such as fibroids, endometriosis and damage to the fallopian tubes all play a part in determining the chances of successful treatment.

For this reason, although we publish our results the true chances of treatment can only be given after your initial consultation and with the results of your investigations.

Other factors that influence the success rates of treatment include the number of embryos replaced, whilst this may increase the number of successful cycles it does increase the risk of multiple pregnancy. Whilst most people see twins as a blessing this does increase risk (Multiple Births, IVF Pack, Providing Fertility Treatment for Women of 40 years of age and over) and every attempt is made to reduce the risk of multiple pregnancy rates whilst increasing pregnancy rates as demonstrated in our figures

Please note that the graph below is national/ natural fertility results:

birth graph

Fig 1 Live birth rates for maternal age in UK.(data HFEA)

Results from Chester


Chester Assisted Conceptions 2009

  All Patients Age <37 Age 37-39 Age > 40
No Cycles 236 141 54 41
No abandoned prior to OC 4 1 1 2
Preg rate / cycle 29%
69/236
35%
50/141
22%
12/54
17%
7/41
Preg rate / ET 33%
69/209
40%
45/118
28%
12/42
20%
7/35
Clinical preg rate / ET 26%
54/209
30%
38/126
24%
10/42
17%
6/35
Clinical preg rate /
Cycle
23%
54/236
27%
38/141
19%
10/54
15%
6/41
         
IVF Cycles 113 69 25 19
No abandoned prior to
OC
2 0 1 1
IVF Preg rate / cycle 28%
32/113
33%
23/69
20%
5/25
21%
4/19
IVF Preg rate / ET 30%
23/76
36%
23/64
25%
5/20
25%
4/16
Clinical preg rate / ET 24%
18/76
33%
21/64
20%
4/20
19%
3/16
         
ICSI Cycles 123 72 29 22
No abandoned prior to
OC
2 1 0 1
ICSI Preg Rate/Cycle 30%
37/123
38%
27/72
24%
7/29
13%
3/22
ICSI Preg rate/ET 36%
37/103
44%
27/62
32%
7/22
16%
3/19
Clinical Preg rate ET 25%
26/103
27%
17/62
27%
6/22
16%
3/19

 

Multiple pregnancy rates 2009


FET

  All cycles Age <37 Age 37-40 Age > 40
No of cycles started 78 45 23 10
Number of embryo transfer 73 43 21 9
No pregnancies 25 15 6 4
Clinical pregnancy rate/cycle 23%
18/78
24%
11/45
17%
4/23
30%
3
Clinical pregnancy rates/et 25%
18/73
26%
11/43
19%
4/21
33%
3/9
Multiple (twin pregnancies) 2 1 0 1
Multiple pregnancy rate 11%
2/18
9%
1/11
0%
0/4
33%
1/3

Click on the links below to view the figures:

 

Assisted Conceptions 2008
Assisted Conceptions 2007
Multiple pregnancy rates 2004-2008 Fresh & Frozen cycles
Assisted Conceptions 2006
Frozen Embryo Transfers 2004 - 2006
Multiple pregnancy rates 2004-2010 Fresh cycles
Multiple pregnancy rates 2004-2006 Fresh & Frozen cycles
Assisted Conceptions 2005

 

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