title: Unexplained infertility: evaluation of the luteal phase; results of the National Center for Infertility Research at Michigan.
abstract: OBJECTIVE
  To evaluate the luteal phase in women with rigorously defined unexplained infertility.
  
  
  METHODS
  Prospective study.
  
  
  METHODS
  National Center for Infertility Research at Michigan.
  
  
  METHODS
  Evaluation of 1,885 women with infertility identified 12 women who met the rigorously defined criteria for unexplained infertility: [1] infertility of > or = 24 months duration, with no male factor, anatomic-functional disorders of the reproductive tract, or immunologic infertility; [2] normal body mass index (BMI); [3] ovulatory cycles ranging from 26 to 32 days; [4] normal luteal phase determined by endometrial biopsy; and [5] normal baseline hormonal profile. Controls (n = 12) were healthy, parous women with normal ovulatory cycles, normal hormonal screen, and were matched for age and BMI to patients.
  
  
  METHODS
  Pattern of follicular growth rate and luteal phase hormonal profile.
  
  
  RESULTS
  Women with unexplained infertility did not differ in menstrual cycle characteristics, follicular growth rate or mean preovulatory follicle diameter, or endometrial biopsy dating. The mean levels of P tended to be lower in the unexplained infertility group throughout the luteal phase, but only the midluteal interval reached statistical significance. Luteal phase mean integrated P or urinary PDG levels of unexplained infertility women did not differ from those of fertile controls. The ratio of integrated E2:P also was significantly greater in women with unexplained infertility than in fertile controls.
  
  
  CONCLUSIONS
  Women with rigorously defined unexplained infertility have subtle hormonal anomalies during the luteal phase when compared with fertile controls.
authors.affiliation: Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Hutzel Hospital, Detroit, Michigan 48201, USA.
authors.forename: C M
authors.initials: CM
authors.lastname: Blacker
authors.forename: K A
authors.initials: KA
authors.lastname: Ginsburg
authors.forename: R E
authors.initials: RE
authors.lastname: Leach
authors.forename: J
authors.initials: J
authors.lastname: Randolph
authors.forename: K S
authors.initials: KS
authors.lastname: Moghissi
mesh_terms: D000328:Adult; D001706:Biopsy; D015992:Body Mass Index; D001831:Body Temperature; D004717:Endometrium / Q000473:pathology; D004958:Estradiol / Q000097:blood; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood; D006801:Humans; D007247:Infertility, Female / Q000145:classification / Q000209:etiology* / Q000503:physiopathology; D008183:Luteal Phase; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D008597:Menstrual Cycle; D006080:Ovarian Follicle / Q000000981:diagnostic imaging; D010060:Ovulation; D011374:Progesterone / Q000097:blood; D012016:Reference Values; D014463:Ultrasonography
chemical_list: D011374:Progesterone; D004958:Estradiol; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone