A Christchurch medical researcher's asking for women across the nation help in her groundbreaking IVF studies.
She's discovered key biomarkers, or signs, that show when conditions in the uterus are more favourable for implanting the embryo.
It's believed if the embryo is frozen until the signs are present, then the success rate of IVF treatment would increase greatly.
Dr Gloria Evans of Otago University in Christchurch says this discovery is only the beginning.
"The initial studies are based on a small number of women, now we need further women to give tissue so we can validate our findings."
Dr Evans says women between the ages of 20 and 37 who live in Christchurch, Auckland, Wellington or Hamilton can help by going to Fertility Associates or calling 0800 10 28 28.
The study needs those who have had unexplained repeat miscarriages or IVF treatment that didn't lead to pregnancy, as well as normal fertile women.