Statistics

SUCCESS RATES: 

IVF  |  Embryo Freezing  |  Donor Egg 


HOW ARE SUCCESS RATES REPORTED?

The following are definitions to consider when reviewing and comparing success rates:

  • Initiated cycle: medication is started to stimulate the ovaries to produce multiple eggs.
  • Egg retrieval: Collecting eggs from the ovaries.
  • Embryo transfer: Placing embryos into the womb (uterus).
  • Pregnancy: Confirmed positive and rising serum pregnancy tests. Transient low-positive pregnancy tests, known as biochemical miscarriages, are not considered pregnancies on our statistics.
  • Miscarriage: Loss of a pregnancy before 20 weeks of gestation.
  • Pregnancy loss: Loss of a pregnancy before livebirth (includes miscarriages, tubal pregnancies and stillbirths).
  • Ongoing pregnancy: Pregnancy proceeding beyond 10 weeks with the presence of fetal heart activity.
  • Livebirth: Delivery of a living baby. The delivery of a multiple pregnancy is considered a single livebirth.
  • Pregnancy rate per egg retrieval: Number of pregnancies divided by the number of egg retrievals performed.
  • Delivered or ongoing pregnancy rate per retrieval: The number of ongoing or delivered pregnancies per egg retrieval performed.


 

 

IVF Pregnancy Rate Statistics From 2007-2010
(Excluding Donor Egg)

AGE Group

<35

35-37

38-40

41-42

43-44

Number of egg retrievals

344 

162 

102 

60 

15 

Number of pregnancies

166 

69 

38 

20 

Ĝ       rate per retrieval

48%

43%

37%

33%

27%

Number of pregnancy losses

 10

5 

6 

Ongoing pregnancy rate per retrieval

45%

40%

31%

25%

20%

 
  as of 08/10         

 


Embryo Freezing/Thawing success rates 2005- 2010

AGE at the time of freezing

<35

35-37

38-40

41-42

Number of embryo transfers 

222 

106

50 

9

Number of pregnancies

107 

40 

16 

1

Ĝ       rate per transfer

48%

38%

32%

11%

Number of pregnancy losses

18 

7 

0

Number delivered or ongoing pregnancies

89 

33 

16 

1

Ĝ       rate per retrieval

40%

31%

32% 

11%


  as of 08/10




Donor Egg success rates (2003- 2010) 

Number of egg retrievals

     61

Number of pregnancies

     34 

Ĝ       rate per retrieval

     56%

Number of pregnancy losses

      6 

Number delivered or ongoing pregnancies

     28

Ĝ       rate per retrieval

     46%


as of 08/10

The CENTER FOR DISEASE CONTROL (CDC) publishes data on IVF success rates. The CDC only reports livebirth rates and that is why the data is usually 2 to 3 years old. The CDC Web site is accessible at  http://www.CDC.GOV/ART/.  In 1992, the US Congress passed the Fertility Clinic Success Rate and Certification Act. This law requires the CDC to publish pregnancy success rates for ART infertility clinics in the .The CDC specifies in the report that many people considering IVF will want to use this report to find the "best" clinic. However, comparison between clinics must be made with caution. Many factors contribute to the success of an IVF procedure. Some factors are related to the experience of the IVF clinic and the quality of services, but other factors are related to the patients themselves, such as age and cause of the infertility. Some clinics may be more willing than others to accept patients with low chances of success and only specialize in some IVF treatments that attract particular types of patients with either better or worse prognoses. Some clinics may discourage patients with a poor prognosis or encourage them to use donor eggs, a practice that results in higher success rates among older women. Clinics that accept a higher percentage of women with multiple unsuccessful IVF cycles will have lower success rates. In contrast, clinics that offer IVF procedures to patients who might have become pregnant with less technically advanced treatment will have higher success rates. The number of embryos transferred affects the pregnancy rate and significantly varies from clinic to clinic. A higher number of embryos transferred may increase the pregnancy rate but also increases the likelihood of multiple gestations which in turn encreases the probability of premature birth and its related problems.




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