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Estradiol (E2) Day 3 25-75 pg/ml Levels on the lower end tend to be better for stimulating. Abnormally high levels on day 3 may indicate existence of a functional cyst or diminished ovarian reserve.
Estradiol (E2) Day 4-5 of meds 100+ pg/ml or 2x Day 3 There are no charts showing E2 levels during stimulation since there is a wide variation depending on how many follicles are being produced and their size. Most doctors will consider any increase in E2 a positive sign, but others use a formula of either 100 pg/ml after 4 days of stims, or a doubling in E2 from the level taken on cycle day 3.
Estradiol (E2) Surge/hCG day 200 + pg/ml The levels should be 200-600 per mature (18 mm) follicle. These levels are sometimes lower in overweight women.

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