Understanding low egg reserve, fertility testing, and your treatment options
By Dr. Gihan Bareh, MD, PhD | Loma Linda Fertility & Wellness Center
For many women, hearing the words diminished ovarian reserve can be frightening. You may have been told that your AMH is low, your FSH is elevated, or your ovaries contain fewer follicles than expected for your age. You may be wondering whether you can still become pregnant and whether there is anything you can do to improve your chances.
The good news is that diminished ovarian reserve does not automatically mean you cannot get pregnant. It means your remaining egg supply may be lower than expected, and your fertility treatment may need to be tailored to your individual circumstances.
Understanding what these results mean is the first step toward making informed decisions about your reproductive future.
What Is Diminished Ovarian Reserve?
A woman is born with a finite supply of eggs. Throughout her reproductive years, that supply gradually decreases. This is a natural part of aging, although the rate of decline varies considerably from one woman to another.
Diminished ovarian reserve (DOR) describes a situation in which the number of remaining eggs, or the pool of follicles available for recruitment, is lower than expected for a woman's age.
Women with DOR may still have regular menstrual cycles and ovulate every month. However, their ovaries may produce fewer eggs than expected when stimulated with fertility medications.
It is important to understand the difference between egg quantity and egg quality. Ovarian reserve tests primarily provide information about egg quantity. They do not directly measure the genetic quality of an individual egg.
Age remains an important factor in egg quality and reproductive outcomes. This means two women with the same AMH level may have different fertility prospects depending on their ages and other clinical circumstances.
What Causes Diminished Ovarian Reserve?
Although ovarian reserve naturally declines with age, some women experience a more pronounced decline than others.
Possible contributing factors include:
- Age-related changes: Egg quantity and quality decline over time, with the decline becoming more significant for many women during their late 30s and 40s.
- Genetic factors: Certain genetic conditions can affect ovarian function and the timing of ovarian aging.
- Family history: A history of early menopause in close relatives may be relevant.
- Ovarian surgery: Procedures involving the ovaries, particularly surgery for endometriomas, may affect ovarian reserve.
- Endometriosis: The disease itself, as well as certain ovarian surgeries used to treat it, may contribute to reduced reserve.
- Cancer treatment: Chemotherapy and pelvic radiation can damage the ovarian follicle pool.
- Certain medical conditions: Some autoimmune or other medical conditions may affect ovarian function.
- Unexplained causes: Many women have diminished ovarian reserve without an identifiable reason.
DOR does not mean that a woman has done something wrong. It is not necessarily caused by stress, diet, or lifestyle, and it can occur even in women who are otherwise healthy.
What Are the Signs of Low Ovarian Reserve?
One of the challenges of diminished ovarian reserve is that many women have no obvious symptoms.
Menstrual periods may remain regular, and ovulation may continue normally. Some women discover they have DOR only after undergoing fertility testing or responding poorly to ovarian stimulation during an IVF cycle.
Possible clues include:
- Shorter menstrual cycles than previously experienced.
- Difficulty becoming pregnant.
- A lower-than-expected number of eggs retrieved during IVF.
- A family history of early menopause.
- A history of ovarian surgery or treatments that can affect ovarian function.
These findings are not diagnostic on their own. Appropriate testing and interpretation by a fertility specialist are important.
How Is Diminished Ovarian Reserve Diagnosed?
A fertility evaluation generally combines blood tests, ultrasound findings, medical history, and previous treatment responses.
1. Anti-Müllerian Hormone (AMH)
AMH is a blood test commonly used to estimate the remaining pool of small ovarian follicles. It can generally be measured at any point in the menstrual cycle.
A low AMH level may indicate a reduced ovarian reserve and can help predict how many eggs might be obtained during IVF stimulation.
However, AMH alone cannot determine whether you can conceive naturally or predict with certainty whether IVF will succeed.
2. Follicle-Stimulating Hormone (FSH) and Estradiol
FSH and estradiol are usually measured early in the menstrual cycle, often on days 2–4.
An elevated FSH level may indicate that the ovaries require greater hormonal stimulation to recruit follicles. Because FSH can fluctuate between cycles, a single result should be interpreted in context.
3. Antral Follicle Count (AFC)
A transvaginal ultrasound allows a fertility specialist to count the small antral follicles visible in the ovaries.
A lower antral follicle count may suggest diminished ovarian reserve and can help guide the choice of stimulation protocol.
4. Your Complete Fertility History
Your age, menstrual pattern, previous pregnancies, ovarian surgeries, partner's semen analysis, and response to prior fertility medications all contribute to treatment planning.
No single laboratory value should determine your entire fertility plan. The goal is to understand your individual situation and identify the most appropriate next step.
Can You Get Pregnant Naturally With Diminished Ovarian Reserve?
Yes, natural pregnancy is still possible for some women with diminished ovarian reserve.
A low AMH level does not necessarily mean you cannot ovulate, fertilize an egg, or carry a pregnancy. Ovarian reserve tests are more useful for estimating ovarian response to stimulation than for predicting the likelihood of natural conception on their own.
However, time can be an important consideration. Age affects both egg quantity and egg quality, and delaying an evaluation may reduce available options.
If you are trying to conceive and have been told that your ovarian reserve is low, it is worth discussing your circumstances with a fertility specialist rather than relying on AMH alone.
What Are the Treatment Options for Diminished Ovarian Reserve?
There is no single treatment that is right for every woman with DOR. The best approach depends on age, ovarian reserve, previous treatment outcomes, other fertility factors, personal preferences, and family-building goals.
1. Individualized Ovarian Stimulation
Fertility medications can stimulate the ovaries to develop multiple follicles during a treatment cycle.
Women with diminished ovarian reserve may produce fewer eggs despite stimulation. A specialist may adjust medication selection, dosing, or the timing and structure of the treatment cycle based on the individual's history and response.
Higher medication doses do not necessarily overcome a limited follicle pool. Treatment should focus on an appropriate, evidence-based strategy rather than simply increasing medication.
2. Intrauterine Insemination (IUI)
IUI may be an option for selected women, particularly when they are younger, ovulate, have at least one open fallopian tube, and have an adequate sperm sample.
Its suitability depends on the entire fertility evaluation. For women with advanced reproductive age, markedly reduced reserve, or other significant fertility factors, moving more promptly to IVF may be worth discussing.
3. In Vitro Fertilization (IVF)
IVF allows eggs to be retrieved after ovarian stimulation, fertilized in the laboratory, and cultured into embryos for transfer or freezing when appropriate.
For women with DOR, IVF may provide an opportunity to obtain and fertilize the available eggs within a treatment cycle. However, fewer eggs may be retrieved, and some cycles may produce no embryos suitable for transfer.
