Diminished Ovarian Reserve
Fewer remaining eggs than expected for your age
Quick Facts
- Type: Reproductive (fertility) condition
- Key tests: AMH, antral follicle count, FSH
- Main impact: Reduced fertility, fewer eggs
- Not the same as: Infertility or menopause
Overview
Diminished ovarian reserve (DOR) describes a situation in which the ovaries contain fewer eggs, and sometimes eggs of lower quality, than would be expected for a person's age. Every person with ovaries is born with a fixed number of eggs that gradually declines over time, and the supply falls more steeply in the years before menopause. In DOR, this decline is greater or earlier than average.
Having a diminished ovarian reserve does not mean a person cannot get pregnant, and it is not the same as infertility or menopause. However, it can make conceiving take longer, can reduce the number of eggs available for treatments such as IVF, and may signal that the window for fertility is shorter than usual. Recognizing it allows for informed planning and timely options.
Symptoms
Diminished ovarian reserve often causes no symptoms at all and is usually discovered through fertility testing rather than by how a person feels.
- Frequently no noticeable symptoms
- Sometimes shorter menstrual cycles than before
- Difficulty becoming pregnant despite regular cycles
- In some cases, early signs of the menstrual cycle changing, especially if reserve is very low
Because symptoms are usually absent, DOR is most often identified during an evaluation for trouble conceiving or before planned fertility treatment.
Causes
The number and quality of eggs naturally fall with age, but several other factors can accelerate the decline.
- Age: The most common factor, with a faster fall in the late 30s and 40s.
- Genetic conditions: Such as Fragile X premutation or Turner syndrome, which can reduce egg numbers earlier.
- Medical treatments: Chemotherapy, radiation to the pelvis, and surgery on the ovaries.
- Other factors: Endometriosis, certain autoimmune conditions, smoking, and prior ovarian infection.
In many people, no specific cause is found, and the reserve is simply lower than average for their age.
Risk Factors
- Older reproductive age
- A family history of early menopause or premature ovarian insufficiency
- Previous ovarian surgery or removal of part of an ovary
- Past chemotherapy or pelvic radiation
- Smoking
- Certain genetic and autoimmune conditions
Diagnosis
Ovarian reserve is estimated using a combination of blood tests and ultrasound, interpreted together with age.
- Anti-Mullerian hormone (AMH): A blood test that reflects the pool of remaining eggs; lower levels suggest reduced reserve.
- Antral follicle count (AFC): An ultrasound count of small follicles in the ovaries at the start of the cycle.
- Follicle-stimulating hormone (FSH) and estradiol: Blood tests early in the cycle; a higher FSH can indicate reduced reserve.
These tests estimate egg quantity, not the certainty of pregnancy, so results are always discussed in the context of the whole picture.
Treatment
There is no treatment that restores the number of eggs, so care focuses on making the most of the remaining reserve and on family-planning options.
- Timely conception planning: Trying to conceive sooner rather than later, with medical guidance.
- Fertility treatment: Ovulation-stimulating medications and in vitro fertilization (IVF), sometimes with protocols adjusted for lower reserve.
- Egg or embryo freezing: For those who wish to preserve fertility for the future.
- Donor eggs: An option when very few or low-quality eggs make pregnancy with one's own eggs unlikely.
A fertility specialist can help weigh these options based on age, test results, and personal goals.
Prevention
The natural decline in eggs cannot be prevented, but some steps may protect fertility or aid planning.
- Avoid smoking, which can speed the loss of eggs
- Discuss fertility preservation before treatments like chemotherapy that can harm the ovaries
- Consider earlier evaluation if you have a family history of early menopause
When to See a Doctor
Consider seeing a doctor or fertility specialist if you have been trying to conceive without success, especially if you are over 35 and have tried for six months or more, or if you have a family history of early menopause. Early testing of ovarian reserve can inform timing and options. Anyone planning treatments that may damage the ovaries should ask about fertility preservation beforehand.
Frequently Asked Questions
Does diminished ovarian reserve mean I can't get pregnant?
No. It means there are fewer eggs than expected for your age, which can make conceiving take longer, but many people with diminished reserve still become pregnant naturally or with treatment. It is not the same as infertility or menopause.
What does a low AMH result mean?
Anti-Mullerian hormone reflects how many eggs remain, so a low level suggests reduced reserve. However, AMH measures egg quantity, not the certainty of pregnancy, and it should be interpreted alongside your age, ultrasound findings, and other tests.
Can I increase my number of eggs?
No treatment can restore lost eggs, since the supply only declines over time. Care instead focuses on making the most of remaining eggs through timely conception, fertility treatment such as IVF, or options like egg freezing and donor eggs.
What causes ovarian reserve to drop early?
Aging is the main factor, but genetic conditions, previous ovarian surgery, chemotherapy or pelvic radiation, endometriosis, and smoking can lower reserve sooner. In many people no specific cause is found.
Should I freeze my eggs if I have diminished reserve?
Egg or embryo freezing can be an option for preserving fertility, and a fertility specialist can advise whether it makes sense based on your test results and goals. Acting sooner generally gives more options because reserve continues to decline.
References
- American Society for Reproductive Medicine (ASRM). Ovarian Reserve Testing.
- American College of Obstetricians and Gynecologists (ACOG).
- MedlinePlus, U.S. National Library of Medicine.
- Office on Women's Health, U.S. Department of Health and Human Services.