Question 48. How successful is IVF?

Different physicians have different styles. I have always attempted to involve my patient's in the decision making process so that they look upon the treatment plan as their plan not my plan. Not all patients want this responsibility. Some look to the physician to run the show with little to no input. I always try to make my recommendation clear but I think that there are often alternative pathways.

For the past 4 years we have been promoting Natural Cycle IVF as an alternative pathway to traditional IVF. I believe that many clinics are unable to offer this approach effectively because of cost limitations and volume concerns. However, it certainly represents more of a finesse approach than that of stimulated cycle IVF. On the other hand, no arguing that stimulated cycle IVF has a higher pregnancy rate per initiated cycle and a low cancellation rate. On the other other hand, some patients are willing to trade off the cancellation rate in order to avoid taking fertility drugs....and so on...

So here is today's Question of the Day from the 2nd Edition of 100 Questions and Answers about Infertility. We are almost halfway there!


48. How successful is IVF?

Overall, the success rates for IVF have improved markedly since 1978 (when Louise Brown was conceived), but success rates vary widely depending on the couple’s infertility factors and the clinic performing the IVF procedure. Success rates for U.S. IVF clinics are published on the CDC’s website (www.cdc.gov/ART/index.htm). The standardization of clinic success rates evolved from 1994 passage of the Fertility Clinic Success Rate and Certification Act (the so-called Wyden law), which seeks to protect U.S. consumers from inflated IVF success rates.

Importantly, many subtleties influence clinic-specific IVF pregnancy rates, including patient selection bias (that is, some clinics tend to treat tougher cases, so their success rates might be lower than those of clinics that take only routine cases). The paucity of clinics that offer Natural Cycle IVF is likely related to this reporting requirement. Natural cycle IVF can be an effective fertility treatment but the pregnancy rate will be less than for stimulated cycle IVF and the number of cancelled cycles will also be higher as patients may ovulate before egg collection, or fail to fertilize or fail to have a viable embryo to transfer.

Unfortunately, at the present time all IVF cycles are reported the same way with the CDC failing to segregate results from Natural Cycle IVF from stimulated cycle IVF. Needless to say, this reporting method does not encourage clinics to offer Natural Cycle IVF as the apparent IVF success rate will be reduced by the inclusion of Natural Cycle IVF in the calculations.

Table A: Factors influencing IVF success rates

1. Patient’s age
2. Type of infertility diagnosis
3. Duration of infertility (Best prognosis if <5yrs)
4. Experience/expertise of the clinic
5. Number of embryos transferred
6. Type of IVF performed: Stimulated vs. Natural Cycle IVF

For women younger than 34 years of age, most will achieve pregnancy within one to three treatment cycles; indeed, many succeed in their first attempt. For women older than 35 years, the success rates tend to decrease simply because the aging process affects the quality of these women’s eggs. For a detailed discussion of IVF success rates, couples should visit the website for the clinic where they are considering treatment. They should also discuss their specific likelihood of success with their reproductive endocrinologist. IVF pregnancy rates do vary by clinic, so patients should carefully scrutinize their chances for success at the particular clinic rendering treatment.