To about 20% per IVF cycle by age 39.
It is recommended that a woman go through three or four IVF cycles before giving up.
The hormone shots can sometimes lead to a serious problem that means you have to stop the IVF cycle.
The average cost of one IVF cycle is $10,000 to $15,000 in the United States.
About 33 out of 100 women in each IVF cycle have a baby (or babies), while about 67 do not.
The advantage is that patients who fail to conceive may become pregnant using such embryos without having to go through a full IVF cycle.
It is also less expensive than many fertility treatments including repeated IVF cycles and the cost of donor human eggs.
Only one in three IVF cycles is successful, each one costing potentially thousands of pounds.
The $12,500 would have covered two IVF cycles, or in other words two full attempts at having a child.
Fertility doctors should never implant more than two embryos, a study of 124,000 IVF cycles has found.
