1. Value of the serum estradiol level for preventing ovarian hyperstimulation syndrome: a retrospective case control study 
Arianna D'Angelo, M.D., Rachel Davies, M.B.B.S., Emad Salah, M.D., Barry A Nix, Ph.D., Nazar N Amso, Ph.D. 
Fertility and Sterility 
Volume 81, Issue 2, Pages (February 2004)
DOI: /j.fertnstert

2. FIGURE 1
Median E2 levels (pmol/L) on day 11 of gonadotropin stimulation for the study (n = 40) and the control groups (n = 39). One value is missing in the control group. P<.0005.
D’Angelo. Serum E2 level and OHSS. Fertil Steril 2004.
Fertility and Sterility  , DOI: ( /j.fertnstert )

3. FIGURE 2
Sensitivity and specificity of the serum E2 level on day 11 of ovarian stimulation during IVF/ICSI cycles for prevention of OHSS.
D’Angelo. Serum E2 level and OHSS. Fertil Steril 2004.
Fertility and Sterility  , DOI: ( /j.fertnstert )