Controlled Ovarian Stimulation (COS) protocols for women with Diminished Ovarian Reserve (DOR) who are Poor Responders to Ovarian Stimulation

Two main factors determine the quality of a woman’s eggs at ovulation or egg retrieval. First is her age and second is the protocol used for ovarian stimulation. With the possible the exception of cases where there is severe sperm dysfunction, it is the chromosomal integrity of the egg rather than the sperm that will ultimately determine the chromosomal integrity of the embryo (i.e. its “competency”, or its potential to propagate a healthy babies). It therefore follows that the only way by which to influence embryo “competence” is through the selection and implementation of an optimal protocol for ovarian stimulation. Since older women (≥39 years) and those who have diminished ovarian reserve are at greatest risk of yielding “incompetent” eggs, they are the ones that require special attention. This article will highlight the reasons why such women are the ones most prone to produce poor quality eggs and embryos and how best to address ovarian stimulation in an attempt to minimize this risk.

Cells that have a full chromosomal component are termed euploid while those that do not, are aneuploid. Most euploid eggs arecompetent”, that is, those that are most likely to propagate euploid, “competent” embryos. Aneuploid, “incompetent” eggs will invariably develop into aneuploid, “incompetent” embryos.

There is a progressive increase in the incidence in egg/embryo aneuploidy with advancing age. To put numbers to the equation; by time a woman reaches 35 yrs; about 60% of her eggs are likely to be aneuploid. By the time she reaches her mid 40’s the incidence will be greater than 85%.

For example, a woman of 43 years would be fortunate if six (6) or eight (8), of her eggs would upon being fertilized, result in one (1) “competent” embryo. As the woman gets older, the inevitable decline in egg/embryo quality results in her having a reduced ability to conceive naturally, a declining IVF success rates, an increase in miscarriages, and a rising incidence of having her baby affected by chromosomal birth defects such as Trisomy 21 (Down’s syndrome). This is why for such a woman, the anticipated IVF birth rate per egg retrieval is less than 10% (i.e. 60% lower than at age 35), the miscarriage rate rises almost by 300% to about 60% and why her risk of having a baby with Down’s Syndrome is about 2% (as compared to 0.1% ).

The anticipation of poor IVF outcome statistics for women in their mid-40’s makes IVF with ovum donation the most rational approach. Yet, in spite of this, many older women still elect to use their own eggs as long as there is even the slightest chance of having their own genetic offspring.

As a woman approaches and then engages her 40’s, her ability to produce “competent” eggs progressively declines. At the same time she experiences diminishing ovarian reserve that results in a progressive fall-off in the number of eggs she is likely to produce at egg retrieval. As a result, there will be a commensurate drop of in the number of “competent” embryos available for transfer to her uterus.

The following are IVF stimulation protocols most often to stimulate the ovaries of women with diminished ovarian reserve:

  • GnRHa Flare (“Short”) protocol: Some IVF physicians advocate the use of gonadotropin releasing hormone-agonist (GnRHa)- flare protocols in which the administration of GnRHa (e.g. Lupron, Buserelin, Nafarelin, Synarel) therapy begins at the same time that ovarian stimulation with gonadotropins is started (usually with the onset of menstruation). The proposed benefit of such an approach is that the GnRHa will cause the woman’s pituitary gland to release large amounts of follicle stimulating hormone (FSH), which would augment the administered dosage of FSH and thereby synergizing the growth of ovarian follicles. The problem associated with this “flare” protocol approach is that concurrent with the GnRHa-induced FSH luteinizing hormone (LH) also surges. In older women and those who have diminished ovarian reserve, the out-pouring of LH can cause the ovarian connective tissue (stroma or theca) which produces male hormones to generate too much testosterone. While a small amount of testosterone is essential for optimal follicle growth, too much testosterone can compromise its development as well as egg/embryo quality. Since older women and women with diminished ovarian reserve often have increased LH production as well as an overgrown of ovarian stroma/theca (i.e. hyperthecosis), a further GnRHa-induced increase in LH can so elevate local ovarian testosterone levels as to severely compromise egg/ embryo “competency”.
  • Combined Clomiphene or Letrozole) /Gonadotropin Stimulation: This approach when used in older women and women with diminished ovarian reserve is also potentially harmful to egg/embryo quality. The reason is that like GnRHa, clomiphene and Letrazole also cause LH to be released in large amounts. Since these medications are given at the start of ovarian stimulation they, as with “flare protocols” can elicit ovarian over-production of testosterone. As such this approach is in my opinion far less than ideal for older women and women who have diminished ovarian reserve.
  • Mid-follicular GnRH-antagonist protocol: With this approach, stimulation with gonadotropins is commenced with the onset of the cycle. Then, several days later, once the majority of follicles have reached about 12mm in size, GnRH antagonist (e.g. Ganirelix, Cetrotide, Cetrorelix, and Orgalutron) is added. The intent in adding the antagonist is to abruptly block pituitary LH release and so prevent a “premature LH surge” with its effect of causing increased ovarian testosterone and impaired follicle and egg development. The problem with such a regime is that women with diminished ovarian reserve already have too much of their own LH around at the beginning of the cycle. Accordingly, blocking LH release only 6-7 days into the stimulation does nothing to prevent the early adverse effects of too much LH-induced ovarian testosterone on early egg/embryo development. It should be borne in mind that eggs are often at their most vulnerable, early on in the cycle. Thus, in my opinion such protocols are also less than optimal for older women and for those with diminished ovarian reserve.
  • GnRHa (“Long”) Pituitary down-Regulation Protocol:
    • The Standard Approach: This protocol, which is the mainstay of ovarian stimulation for IVF, is either initiated about 1 week after natural ovulation (a “luteal phase start”) or is launched off a monophasic birth control pill (a “BCP start”). In the case of the latter, the BCP is taken for at least 8 days before, GnRHa is added daily. Two days after starting the GnRHa, the BCP is stopped. Menstruation usually ensues within 3-5 days. GnRHa administration is continued and FSHr stimulation is initiated. Both daily Gonadotropin stimulation and GnRHa are continued until the day of the “hCG trigger”. The initial administration of agonist serves to rapidly expunge pituitary FSH and LH causing an immediate rise in the blood levels of both hormones. Then, within a few days, having virtually exhausted/depleted pituitary gonadotropin stores, the blood levels of FSH and LH both rapidly decline, such that by the time menstruation occurs, the levels are very low. The initial premenstrual GnRHa-induced rise in FSH helps recruit ovarian antral follicles for the upcoming cycle, while the ultimate virtual depletion of LH serves to prevent excessive ovarian testosterone production and protects egg quality. I prefer to use pure FSHr (Folistim, Puregon, Gonal F) for ovarian stimulation for IVF with the initial dosage being reduced by about 25% within a few days. Thereupon a very small amount of daily LHr (Luveris) or Menopur (menotropins) is added.
    • Agonist/Antagonist Conversion protocol (A/ACP): Agonists are believed to competitively inhibit follicle response to FSH. Therefore, in an attempt to improve follicle response to FSH we modified the “standard approach” (a- above) as follows: Rather than continuing to give GnRHa throughout the stimulation protocol, we here supplant GnRHa with low dosage GnRH antagonist starting with the initiation of menstruation, continuing throughout stimulation until the day of the “hCG trigger” at which point both the antagonist and gonadotropins are discontinued. We have had very good results using the A/ACP modification of the “standard long pituitary down-regulation protocol”. In fact it has become my preferred approach for most women with a normal ovarian reserve, who undergo ovarian stimulation for IVF.

Augmenting ovarian response to gonadotropins in women with DOR:

  • The administration of human growth hormone (HGH), as an adjunct to ovarian stimulation might enhance follicle and egg development in older women, women with DOR, those with PCOS and women with a past history of producing poor quality eggs at ER. This effect of HGH is thought to be mediated by HGH promoting production’/activity of insulin-like growth factor 1 (IGF-1). Two basic mechanisms have been proposed: 1) improving the response to gonadotropin therapy by up-regulating the FSH receptors on the granulosa cells that form the inner lining of follicles and, 2) through a direct enhancing effect of HGH on the egg’s mitochondrial activity.  While human eggs do have HGH receptors, those retrieved from older women show decreased expression of such receptors (as well as a reduction in the number of functional mitochondria) as compared with those derived from younger women. In fact, it has recently been shown that older women treated with HGH showed a marked increase in functional mitochondria in their eggs along with improved egg quality.
  • Agonist/Antagonist Conversion Protocol (A/ACP) with “Estrogen Priming”: Estrogen primes follicle FSH receptors, thereby enhancing response to FSH. This forms the basis of the “estrogen priming” approach in women with diminished ovarian response. The approach involves administering estradiol by daily injection, or by skin patch starting about 10 days prior to initiating high dosage gonadotropin stimulation. As with the A/ACP, the estrogen priming protocol is initiated a week post-ovulation (luteal phase start) or is launched off a birth control pill. It also starts with GnRHa administration for about 5 days whereupon menstruation ensues and the agonist is supplanted by an antagonist. But this is where things change slightly such that instead of directly initiating FSHr injections, the patient, while continuing to take the GnRH antagonist now receives twice weekly estradiol valerate injections or daily estradiol skin patches (I prefer the former) for a period of about 10 days. Thereupon, daily high dosage FSHr (750U) is administered once daily. Four to five days later dosage of FSHr is reduced to 600U daily and a small daily dose (75U) of LHr (Luveris) or Menopur is added. “Estrogen priming” is continued until more than 50% of the follicles are at least 12mm in size whereupon it is discontinued.
  • Nutritional supplements, such as folic acid and antioxidants (especially Coenzyme Q) enhance egg development and maturation. While more data is needed to support this contention, it is also true that such supplements do no harm whatsoever. Also they are low cost, so there is really no harm using them. DHEA has in recent times been touted as being capable of enhancing egg quality and ovarian response. However, there is no convincing evidence of any such benefit in my opinion. Besides, DHEA is readily metabolized to testosterone in the ovaries and as stated, many older women and those with DOR are more vulnerable to over-exposure to ovarian testosterone, I believe that the indiscriminate use of DHEA in such cases can be potentially harmful to such women.


Chrissy G

Do you have a recommended dosage for HGH? I’ve heard all different dosages and timing protocols? Beginning of stim, end of stims, and throughout and all different doses. If it matters, I just turned 40, have one ovary, and am about to start my third cycle. First resulted in 8 eggs, 6 fertilized, only two made it to day 5 and were both abnormal. Second, only three eggs as I started with 2 lead follicles, all three fertilized and made it to day 5, did a fresh transfer and ended in a chemical pregnancy. Third try we are trying estrogen priming and adding in menopur later in the cycle and only 1 vial to try to help with quality. Also recommended the addition of hgh. I’m just curious on your recommendation for dosage and when it should be taken.

Thanks so much for your time!

Dr. Geoffrey Sher

This needs to be discussed with your own RE. It would be presumptuous of me to insert myself into that decision.

Good luck!

Geoff Sher


I’m 39 yrs old and tried my 1st round of IVF. They had me put on estrogen patch & do 3 days of ganirelex shots before my period, then after ultrasound confirmed ovulation, I did 375 iu of follistim & 250 Menopur for 7 days. I had 5 follicles, all about 5 mm in size. My dr, canceled my ivf round and said my only option was a donor egg. I got pregnant naturally 3 months before IVF, but miscarried around week 5. Is egg donor my only option left?

Dr. Geoffrey Sher


I honestly recommend that we talk. Please call 800-780-7437 and ask Julie to set up a Skype consultation.

Geoff Sher


I forgot saying i have 3 kids fsh 9.2 E72 and LH us not like PCOS is only 4,2. and in the ultrasound always my ovaries are multimicrofollicular but y dont have PCOS as a sindrome , i ovulate normally,


Thank you very much for your answer. I am afraid here in Argentina doctors arent used to do coasting , Also i am afraid if I do all lupron protocol these could supress my ovaries as i have 43. The case that i had mild Ohhs with 12 eggs retrieved with my age and in a femara with antagonist protocol is very strange said my RE. Also my androstenodione is 3.5 ng . So…you sugest then the long protocol but no the AACP? all lupron no antagonists


Hi doctor, You would recomend gonapeptyl instad of lupron? Is the effect the same? Also ask you if i have 43 previous mild Ohhs ,should i use the AACP WITH ESTEOGEN PRIMING or better the AACP alone? So happy i found your page is so informative and educacional!

Dr. Geoffrey Sher

I would not use an agonist/antagonist conversion protocol in women who tend to hyperstimulate.I would use a modest long pituitary down-regulation, in preparation for “coasting”.I do not use antagonists in high responders (e.g., PCOS) because it interferes with the assay of E2 (often causing the value to be understated), a valuable index in assessing risk for the development of severe/critical OHSS. I also do not believe in the agonist trigger to prevent OHSS. The reason is that the magnitude of the induced LH surge varies and if too little LH is released, meiosis can be compromised, thereby increasing the oocyte aneuploidy index.

My approach is consistently to use a long pituitary DR protocol with an agonist, coming off 1-2 months on the BCP. The latter is intended to lower LH and thereby reduce stromal activation (hyperthecosis) in the hope of controlling ovarian androgen release. I then stimulate with low dosage FSHr to which I add a smidgeon of LH/hCG (Luveris/Menopur) from the 3rd day and watch for the # of follicles and [E2] starting on the 7th day of COS. If there are > 25 follicles, I keep stimulating (regardless of the [E2] until 50% of all follicles reach 14mm. Then, provided the [E2] is >2500pg/ml, I stop the agonist and the gonadotropin stimulation and follow the E2 (only) daily, without doing further US examinations. The [E2] will almost invariably climb and I watch it go up (regardless of how high the concentration of E2reaches) and track it coming down again. As soon as the [E2] drops below 2500pg/ml (and not before then ever), I administer 10,000U hCGu or hCGf (Ovidrel/Ovitrel-500mcg) as the “trigger” and perform an egg retrieval 36h later. ICSI is a MUST because “coasted” eggs usually have no cumulus oophoris and eggs without a cumulus will not readily fertilize on their own. All fertilized eggs are cultured to blastocyst (up to 6 days). And up to two (2) are transferred transvaginally under US guidance.

The success of this approach depends on precise timing of the initiation and conclusion of “prolonged coasting”. If you start too early, follicle growth will stop and the cycle will be lost. If you start too late, you will encounter too many post-mature/cystic follicles (>22mm) that usually harbor abnormally developed eggs.

Use of the above approach avoids unnecessary cycle cancellation, severe OHSS, and optimizes egg/embryo quality. The worst you will encounter is mild to moderate OHSS and this too is uncommon.

I strongly recommend that you visit Then go to my Blog and access the “search bar”. Type in the titles of any/all of the articles listed below, one by one. “Click” and you will immediately be taken to those you select. Please also take the time to post any questions or comments with the full expectation that I will (as always) respond promptly.
• Controlled Ovarian Stimulation (COS) for IVF: Selecting the ideal protocol
• IVF: Factors Affecting Egg/Embryo “competency” during Controlled Ovarian Stimulation(COS)
• The Fundamental Requirements For Achieving Optimal IVF Success
• Traveling for IVF from Out of State/Country–
• A personalized, stepwise approach to IVF
• How Many Embryos should be transferred: A Critical Decision in IVF.
• The Role of Nutritional Supplements in Preparing for IVF
• “Triggering” Egg Maturation in IVF: Comparing urine-derived hCG, Recombinant DNA-hCG and GnRH-agonist:
• The “Lupron Trigger” to Prevent Severe OHSS: What are the Pro’s and Con’s?

Please call or email Julie Dahan, my patient concierge. She will guide you on how to set up an in-person or Skype consultation with me. You can reach Julie at on her cell phone or via email at any time:
Julie Dahan
• Email:
• Phone: 702-533-2691
 800-780-7437

Geoff Sher


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