Clinical Chemistry -- Snyder et al. 51 (10): 1830 Figure 2

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Figure 2. hCG vs age (A) and FSH vs age (B) in all 720 nonpregnant patients.

The vertical lines define the ages of each nonpregnant cohort (18–40 years, premenopausal; 41–55 years, perimenopausal; and >55 years, postmenopausal). In A, the dashed line is the 5.0 IU/L cutoff for a positive hCG test. The curves are fit with locally weighted regression (lowess smoothing).