Private IVF clinics might promise a brilliant success rate, or a friend may have a feeling you'll definitely get pregnant this year, but if you prefer cold, hard statistics, a new IVF calculator will tell it to you straight.
The independent tool was created by the University of Aberdeen drawing on statistics from more than 110,000 women in the UK between 1999-2008, yet Australian experts are reminding no two patients are the same.
The calculator asks for your age, how many years you have been trying to conceive, whether you've been pregnant before and any problems with ovulation, tubes, male-factor fertility problems or unexplained fertility problems.
So a 34-year-old woman who has been trying to get pregnant for one year has a 41.97 percent chance of having a baby after one cycle of IVF, but as you can see from the graph, those chances improve with subsequent cycles.
It's the first model to provide cumulative estimates over multiple complete IVF cycles, but researchers caution it doesn't include some important factors to fertility like the woman's body mass index, whether she smokes and hormone levels.
Fertility Society of Australia president Michael Chapman told The Huffington Post Australia every patient was different.
"There's one biggest single predicting factor in chances of success and that's your age, it almost overrides everything but not quite," Chapman said.
"If you're overweight, it reduce chances and if you smoke it reduces chances, if have a low anti mullerian hormone again that reduces chances."
In Australia, he said the live birth rate per initiated IVF cycle increased from 18.1 percent in 2011 to 19.8 percent in 2014 and that calculator should not go too far back.
"They're using data that goes back 10 years but the practice has changed in the last five years, mostly due to success rates using frozen embryos," he said.
"Frozen embryos actually deal with a couple of issues -- in some women the lining of the womb is out of sync with the embryo in a fresh cycle, but by freezing the embryo, it puts it back to the correct time, and that makes a difference.
"The other thing that's happened in the last few years is increased embryonic genetic testing so they're only putting in embryos that are genetically normal."
He said the society was working on an Australian predictor model that would also take into account things like BMI.Suggest a correction