Retrieval is tomorrow (!) she counted 20 follicles yesterday , but a couple were around 11-12. I guess im just concerned that we wont get that many mature egg. Just wondering what everyones estrogen levels were at during their last blood draw prior to egg retrieval and how many mature eggs were retrieved vs immature. I am curious to see because i have been reviewing how my last ivf went. I think he believes that if the e2 is too low the ovaries are not responding to the fsh produced or injected into the body and therefore the eggs will not mature and be viable. if you decide to coast to see if the e2 (estradiol) levels come down, be aware that coasting can negatively affect egg quality. Be sure to discuss any changes to your protocol thoroughly with your doctor and prepare for the possibility of cancellation, particularly if the estradiol levels continue to rise despite coasting. My e2 was 4,428 we did 12 dose of novarel that night and had 17 eggs - 16 mature and 16 fertilized. However i did have minor ohss and did not have a successful ivf even though we transferred 2 what the re called perfect embryos. the estradiolfollicle ratio (e2fol) was defined as estradiol level per mature follicle 14 mm in diameter. Estradioloocyte (e2o) ratio was defined as estradiol level per or. These two ratios were categorized by the 25th percentile into four groups. What is the estradiol test? The estradiol test is a simple blood used to measure the levels of estradiol in your blood stream. In a normal cycle, the estradiol levels are initially low and they gradually rise as the follicle matures. With a single follicle, peak e2 levels are about 200-300 pgml just prior to ovulation. Visit texas fertility center (512) 451-0149 after hours (512) 458. 1121 our patients visit texas fertility center to achieve their dreams of having a baby. Utilizing advanced tools and technologies, our doctors take on the toughest cases, providing renewed hope for would-be parents. Ivf is all about the eggs and one important indicator of your cycle is follicle size. Follicle size indicates how your eggs are developing and when they will be mature enough for retrieval. Follicles grow approximately 2mm a day on average and produce increasing levels of estradiol. E2 is the steroid hormone that is produced by the cells lining the ovarian follicles in response to fsh, and the very high levels of e2 within the leading follicle nourish and mature the egg. Some e2 reaches the blood to cause the lining of the uterus to grow, the secretion of ovulatory cervical mucus, and to provide feedback to the brain and.