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The Most Important Decision in IVF: Choosing the Right Ovarian Stimulation Protocol:

Why Individualized Ovarian Stimulation May Be the Single Most Important Modifiable Factor Determining IVF Success

by

Geoffrey Sher MD/Drew Tortoriello MD/Sitara Ravikumar MD

 

Sher Fertility Solutions (SFS

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For many people pursuing IVF, success appears to be a matter of luck.

One couple becomes pregnant after a single cycle, while another experiences repeated failure despite transferring seemingly excellent embryos and receiving high-quality medical care.

When IVF fails, patients are often told they have an “egg quality problem.” While that may be true, the explanation is frequently incomplete. The more important question is often:

Why was egg quality poor in the first place, and could

 it have been improved?

After more than four decades in reproductive medicine, I have become increasingly convinced that one of the most important—and frequently overlooked—factors influencing IVF outcome is the ovarian stimulation protocol used to recruit and mature eggs.

• Age matters.
• Genetics matter.
• Ovarian reserve matters.
• Sperm matters.
• Uterine receptivity matters.

However, if there is one treatment decision that can profoundly influence whether a woman produces chromosomally normal embryos, it is selecting the stimulation protocol that best fits her unique biology.

The Seed-and-Soil Relationship

For thousands of years, farmers have understood a simple truth:

A healthy seed requires fertile soil.

The same principle applies to human reproduction.

The embryo is the seed…The uterus is the soil.

A perfect embryo may fail if the uterine environment is unreceptive. Conversely, even the most receptive uterus cannot rescue an embryo that lacks the genetic capacity to become a healthy baby. While both are important, embryo competency remains the single most important determinant of reproductive success.

While both egg and sperm contribute to embryo

competence, in the majority of cases, it is the

egg that plays the predominant role!

Egg Quality: The Foundation of Embryo Competency

The egg contributes far more than half of the embryo’s chromosomes. It provides the mitochondria that generate energy, the cellular machinery that drives early embryonic development, and the cytoplasmic environment necessary for normal cell division.

The most important measure of egg quality is not how an egg looks under a microscope. The real question is:

Can that egg produce a chromosomally normal embryo?

A chromosomally normal (euploid) embryo has the greatest chance of implanting, developing normally, and resulting in the birth of a healthy child.

Age and Egg Quality

Female age remains the single most powerful predictor of egg competency.

A woman is born with all the eggs she will ever have. As reproductive age advances, the proportion of chromosomally normal eggs progressively declines. Beyond age 35, that decline accelerates, and by the early forties only a small percentage of remaining eggs are likely to be chromosomally normal.

• No treatment can reverse ovarian aging.
• No supplement can restore youthful chromosomes to aging eggs.

However, it is in our opinion, often possible to optimize the developmental potential of the eggs that remain through careful selection of the ovarian stimulation protocol.

Why Ovarian Reserve Matters

Every woman is born with a finite number of eggs residing within ovarian primordial follicles.

As both the number and quality of those eggs decline below a certain theoretical threshold, diminished ovarian reserve (DOR) develops.

Clinically, DOR is commonly associated with:

• Lower AMH levels
• Elevated FSH levels
• Often elevated LH levels
• Reduced egg yield
• Reduced egg competency

Most attention is often focused on the reduced number of eggs available. In our opinion, the more important issue is often the hormonal environment that accompanies declining ovarian reserve.

As ovarian reserve falls, pituitary LH activity often becomes increasingly influential. LH stimulates ovarian production of androgens such as testosterone and androstenedione, which are necessary building blocks for estrogen production.

A moderate amount of ovarian androgen is essential….too much becomes a problem as it compromises egg quality.

Premature Luteinization: The Hidden Enemy

One of the most important concepts in ovarian stimulation is understanding the impact of excessive LH activity.

Excessive LH-driven androgen production can disrupt orderly follicular development and compromise egg competency. This process is commonly referred to as premature luteinization.

Women over 40 and women with DOR are particularly vulnerable because they often produce excessive biologically active LH.

Once established, premature luteinization cannot reliably be reversed. Its consequences may include poor egg quality, reduced fertilization, impaired blastocyst development, increased embryo aneuploidy, premature ovulation, and IVF failure.

In our experience, preventing premature luteinization is one of the most important goals of ovarian stimulation.

 

Why One Size Does Not Fit All

One of the most common mistakes in IVF is the repeated use of the same stimulation protocol cycle after cycle.

The medication dose may change, but the protocol itself remains essentially unchanged.

Every patient is different.

Age, ovarian reserve, AMH, hormonal profile, ovulatory status, prior IVF response, and reproductive history all influence how ovarian stimulation should be designed.

The goal is not simply to retrieve more eggs.

The goal is to recruit the largest possible cohort of competent eggs while protecting egg quality throughout stimulation.

In IVF, quality ultimately matters more than quantity.

Standard Ovarian Stimulation Strategies

Before discussing specific protocols, it is important to remember that the objective of stimulation is not merely follicular growth.

The objective is to create the optimal hormonal environment for healthy egg development while minimizing the risk of premature luteinization.

• Conventional Agonist Down-Regulation

For women with normal or high ovarian reserve, the conventional agonist protocol remains one of my preferred approaches.

By inducing follicular recruitment and then suppressing LH release during stimulation, it creates a predictable hormonal environment and reduces the risk of premature luteinization.

• Agonist/Antagonist Conversion Protocol (A/ACP)

For women with mild-to-moderate DOR, I frequently favor the Agonist/Antagonist Conversion Protocol.

This strategy suppresses excessive endogenous LH activity while preserving ovarian responsiveness to gonadotropins.

In my experience, it is one of the most effective ways of minimizing excessive androgen exposure while optimizing follicular growth.

 

• A/ACP with Estrogen Priming

For women with severe DOR, I often add estrogen priming before stimulation.

This may improve follicular synchronization and enhance responsiveness to FSH.

While not appropriate for every patient, it has become an important component of my approach to severe ovarian reserve depletion.

• DuoStim IVF: A Useful Addition to the Armamentarium

An important recent development in ovarian stimulation has been the emergence of DuoStim IVF, sometimes referred to as the “Shanghai Protocol”.

DuoStim is based on the concept that follicles may be recruited in more than one wave during a menstrual cycle. A woman first undergoes conventional stimulation and egg retrieval. Within several days, stimulation is restarted during the luteal phase, and a second egg retrieval is performed before the cycle ends.

The objective is not to improve egg quality. Rather, it is to accumulate more eggs and embryos within the shortest possible time.

This approach may be particularly useful in selected situations, including women with severe DOR, advanced reproductive age, poor ovarian response, embryo-banking strategies, and patients requiring urgent fertility preservation before cancer treatment.

Initially, many clinicians questioned whether the ovarian disruption associated with a first egg retrieval might adversely affect the quality of eggs obtained during the second stimulation. However, available evidence has generally shown comparable fertilization rates, blastocyst development, embryo euploidy rates, and frozen embryo transfer outcomes between eggs obtained from the first and second retrievals.

At the same time, DuoStim should not be viewed as a breakthrough that universally improves IVF outcomes. The BISTIM randomized trial suggested that its principal advantage may be efficiency rather than superiority. In other words, DuoStim appears to compress two retrievals into a shorter period of time rather than producing better eggs or embryos than two conventional consecutive stimulation cycles.

For that reason, we view DuoStim as a valuable addition to the IVF armamentarium in carefully selected patients, particularly when time is critical.

• Mini-IVF and Natural Cycle IVF

Mini-IVF and Natural Cycle IVF are fundamentally different concepts.

Many rely heavily upon Clomiphene or Letrozole and generally produce fewer eggs and often ones of poorer quality.

While these approaches are often promoted as being gentler, the greatest challenge facing older women and women with DOR is frequently not overstimulation, it is under-stimulation.

For patients who already have a diminished probability of producing a chromosomally normal embryo, obtaining too few eggs may significantly reduce the chance of success.

For this reason, I generally do not favor these approaches in older women and women with diminished ovarian reserve.

• EZ-IVF: A Different Mild-Stimulation Approach

Over the years, we have become increasingly convinced that the debate should not be between aggressive stimulation and minimal stimulation. The real question is whether the protocol is appropriate for the patient being treated.

This philosophy led to the development of EZ-IVF, a simplified approach designed primarily for younger women with adequate ovarian reserve.

Using carefully controlled low-dose gonadotropin stimulation, EZ-IVF seeks to reduce medication requirements, cost, monitoring, and treatment burden while still recruiting a meaningful cohort of competent eggs.

In appropriately selected patients, it can provide an excellent balance between effectiveness, convenience, safety, and affordability.

• A Brief Word About Clomiphene and Letrozole

Clomiphene citrate and Letrozole are widely used fertility medications and can be very effective in appropriately selected patients.

However, both ultimately work by increasing pituitary stimulation.

In women with advanced reproductive age, DOR, endometriosis, or other conditions associated with excessive LH influence, this may contribute to a less favorable hormonal environment during IVF.

For this reason,we generally do not favor Clomiphene- or Letrozole-based IVF stimulation strategies in older women and women with diminished ovarian reserve.

• Human Growth Hormone

Research suggests that HGH may benefit selected women with advanced reproductive age and diminished ovarian reserve. Potential benefits include improved follicular sensitivity to FSH, enhanced granulosa-cell function, and improved mitochondrial activity within the egg.

While HGH is not a cure for ovarian aging, it may be a useful adjunct in carefully selected patients.

• “Triggering” Final Egg Maturation

Even the best ovarian stimulation protocol can be compromised by an improperly selected, timed, or dosed trigger. The trigger is used to induce final egg maturation prior to egg retrieval and is every bit as important as the stimulation protocol itself. Traditionally, hCG has been the most commonly used trigger. It is available in two forms: urinary-derived hCG (hCGu), extracted from the urine of postmenopausal women, with examples including Pregnyl, Profasi, and Novarel; and recombinant hCG (hCGr), produced through recombinant DNA technology, known as Ovidrel. In our experience, the optimal dose of hCGu is generally 10,000 IU and of hCGr, 500 µg, administered approximately 32–36 hours before egg retrieval. GnRH agonists (GnRHa), such as Lupron, Buserelin, and Decapeptyl, may also be used as triggers, either alone or in combination with hCG. The choice of trigger, its dosage, and the timing of administration should always be individualized according to the patient’s clinical profile and ovarian response. Proper trigger selection can have a profound impact on egg maturity, egg quality, embryo development, and ultimately IVF outcome.

Preventing OHSS Without Sacrificing Egg Quality

Women with a very high ovarian reserve, particularly those with polyendocrine metabolic ovarian Syndrome (PMOS, previously referred to as PCOS)—are often extremely sensitive to ovarian stimulation with gonadotropins. As a result, they may produce an excessive number of follicles and become vulnerable to a potentially serious complication known as Ovarian Hyperstimulation Syndrome (OHSS). In addition to the health risks associated with OHSS, excessive ovarian stimulation may also adversely affect egg quality.

More than three decades ago, a treatment strategy known as prolonged coasting was introduced to help address this problem. Prolonged coasting involves temporarily stopping gonadotropin stimulation while continuing pituitary suppression. This allows estradiol levels to decline to a safer range before administering the hCG trigger that induces final egg maturation.

When carefully timed and applied in appropriately selected patients, prolonged coasting can dramatically reduce the risk of severe OHSS without compromising egg or embryo quality. When combined with cryopreservation of embryos and delayed frozen embryo transfer (FET), it provides an effective strategy for maximizing safety while preserving the chances of a successful pregnancy.

For more than three decades, prolonged coasting has remained an important component of my approach to managing patients at high risk for OHSS.

Completing the IVF Equation

Even the most competent embryo requires a receptive uterine environment.

• The embryo remains the seed.
• The uterus remains the soil.
• Both are required for success.

The Most Important Message!

If there is one message, I hope patients take away from this discussion, it is this:

When IVF fails because of poor egg yield, poor egg quality, poor embryo development, or failure to produce competent embryos, the answer should not automatically be resignation.

• The answer should be re-evaluation.
• Was the stimulation protocol appropriate?
• Was LH adequately controlled?
• Was premature luteinization prevented?
• Was the trigger optimal?
• Was treatment truly individualized?

No protocol can reverse reproductive aging.No protocol can guarantee a chromosomally normal embryo.

However, we firmly believe that careful selection of an individualized ovarian stimulation protocol can profoundly influence egg quality, embryo competency, and ultimately the likelihood of achieving a healthy pregnancy.

• Every woman brings a unique biology to treatment.
• Every ovary speaks a different hormonal language.
• The responsibility of the fertility specialist is not merely to prescribe medications. It is to understand that language and tailor treatment accordingly.
• IVF success is not simply about retrieving eggs.
• It is about creating the optimal hormonal environment in which the best possible eggs can develop.

That is why we believe the most important decision in IVF may not be the laboratory, the embryo transfer, or even genetic testing. It may be choosing the right stimulation protocol in the first place.

 

 

Addendum: A Final Perspective

The views expressed in this article reflect a personal clinical experience and observations accumulated over more than four decades in reproductive medicine and IVF. Many stimulation protocols are available, and thoughtful clinicians may reasonably differ in their approaches. The protocols discussed here are those that we have found to be the most effective and reliable in my own practice and have served as the guiding principles behind our approach to individualized ovarian stimulation.