These tables provide the probability of having two or three successful live births after successive IVF treatments using the cumulative binomial distribution method.

Table 1 gives the probability of having two live births, while Table 2 gives the probability of having three live births.

1. Determine the IVF success rate for each embryo transfer cycle you are interested in studying using:

a) Results from the Smart Fertility Choices Real IVF Success Rates Calculator available here

b) National database report for your country such as the SART Clinic Summary Report. [1] (see percentage of transfers resulting in live births result), or

c) Your fertility clinic: When selecting a per embryo transfer success rate, be careful to select a rate that matches the intended number of embryos you plan to transfer. Database records will give you the national average, however you may prefer to use single elective embryo transfers which will give you lower per-transfer success rates. See www.SmartFerilityChoices.com for more information on deciding how many embryos to transfer.

2. Select the table for either two or three live births depending on how many children you are interested in having.

3. Look up the per embryo transfer cycle success rate value in the first row of the table below that is closest to the number you wish to find the probability for.

4. The values given in the column corresponding to the value you have chosen gives you the probability of having a two or three babies after each success IVF treatment cycle.

A woman with a per embryo transfer success rate of 32%, has:

- a 38% chance of having two babies after 4 IVF cycles
- a 62% chance after 6 cycles and,
- an 88% chance after 10 cycles.

If she wants to have three children, a woman with a per embryo transfer success rate of 32%, has:

- a 10% chance of having three babies after 4 IVF cycles
- a 29% chance after 6 cycles and,
- a 67% chance after 10 cycles.

These probabilities assume that all eggs used to make these embryos were harvested within the same year. Eggs retrieved at an older age have lower probabilities of success than younger eggs.

[1] *Note that Clinics in the USA typically transfer two or more embryos at a time and hence have significantly higher success rates than those in Europe, Australia and New Zealand where single embryo transfers are the more common protocol.*

**Table 1. Probability of having two live births after each successive IVF cycle.**

**Table 2. Probability of having three live births after each successive IVF cycle.**