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Table 4 Comparison of estrogen measurements in the early follicular phase and the ovulatory phase

From: Changes in estrone and estradiol levels during follicle development: a retrospective large-scale study

  Early follicular phase Ovulatory phase
(n = 12) (n = 14)
Serum E2 (pg/mL)   
Measured with ST AIA-PACK E2 reagent (A) 58.7 ± 7.9 245.4 ± 50.5
Measured with ST AIA-PACK iE2 reagent (B) 21.3 ± 4.7 262.9 ± 54.2
(A)/(B) 2.9 ± 0.6a 0.9 ± 0.1a
Serum E1 (pg/mL) 68.0 ± 13.9 191.1 ± 51.9
E1/E2 (measured with A) 3.4 ± 1.1a 0.7 ± 0.1a
Serum E3 (pg/mL)b <5.0 <5.0
  1. Data are presented as mean ± standard deviation
  2. aSignificant differences were found between the early follicular phase and the ovulatory phase groups (P <0.01)
  3. bSerum E3 concentrations were below the detection range for both groups
  4. E1 estrone, E2 estradiol, E3 estriol