TY - CHAP M1 - Book, Section TI - Evaluation of the Infertile Couple A1 - Hoffman, Barbara L. A1 - Schorge, John O. A1 - Halvorson, Lisa M. A1 - Hamid, Cherine A. A1 - Corton, Marlene M. A1 - Schaffer, Joseph I. Y1 - 2020 N1 - T2 - Williams Gynecology, 4e AB - Infertility is defined as the inability to conceive after 1 year of unprotected intercourse of reasonable frequency. It can be subdivided into primary infertility, that is, no prior pregnancies, and secondary infertility, referring to infertility following at least one prior conception. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/12/11 UR - obgyn.mhmedical.com/content.aspx?aid=1171530950 ER -