What is fertility medicine? Rei? Reproductive health?

Reproduction. All the terms are related to reproduction, especially female reproduction. A reproductive endocrinologist (rei) is an obstetrician gynecologist that has had sub specialty training in infertility and female hormonal management.
Fertility definition. Fertility rates are typically expressed in terms of likelihood to conceive within a one year time frame. Couples in whom the woman is under 35 years old, are considered infertile if there is no conception within 1 year of trying, but if the woman is older, then 6 months without success should result in evaluation. Rei is the term for a specialist in female infertility.