title: Can follicle-stimulating hormone be used to define menopausal status?
abstract: OBJECTIVE
  To assess the ability of the level of follicle-stimulating hormone (FSH) to distinguish among premenopausal, perimenopausal, and postmenopausal women.
  
  
  METHODS
  We examined cross-sectional and longitudinal data from the second phase of the Massachusetts Women's Health Study (1986 to 1995), a population-based cohort of 427 premenopausal and perimenopausal women identified from the first phase of the Massachusetts Women's Health Study (1981 to 1986).
  
  
  RESULTS
  Boxplots of FSH levels throughout the menopausal transition displayed considerable overlap. Logistic regressions and their resulting receiver operating characteristic curves further demonstrated that, although FSH is a statistically significant predictor of menopausal status, no single value of FSH is expedient for distinguishing premenopausal from perimenopausal or perimenopausal from postmenopausal women.
  
  
  CONCLUSIONS
  FSH alone is not an effective predictor of transition into the perimenopausal or postmenopausal period. Specifically, the frequently recommended FSH cutoff of 40 IU/L is inappropriate by itself for clinical determination of postmenopausal status.
authors.affiliation: New England Research Institutes, Watertown, Massachusetts 02172, USA.
authors.forename: R K
authors.initials: RK
authors.lastname: Stellato
authors.forename: S L
authors.initials: SL
authors.lastname: Crawford
authors.forename: S M
authors.initials: SM
authors.lastname: McKinlay
authors.forename: C
authors.initials: C
authors.lastname: Longcope