Table 1.

Circulating Estradiol and Progesterone Concentrations at Endometrial Biopsy

Histologic stage of cycle	Age, mean, years	E2, mean (range), pmol/L	P4, mean (range), nmol/L
Menstrual (n = 8)	41	192.25 (55–514)	3.71 (1.24–10.59)
Proliferative (n = 16)	42	441.18 (79–1105)	2.81 (0.97–7.1)
Early secretory (n = 10)	42	497.50 (289–841)	59.60 (23.2–112.91)
Mid secretory (n = 11)	40	638.00 (242–1949)	64.30 (25.47–114.53)
Late secretory (n = 6)	42	318.22 (59.09–819)	8.22 (1.06–16.95)