What Health Class Didn’t Teach You About Fertility | Dr. Kaajal Abrol | TEDxUofT

Key Concepts

• Fertility and Age: The central theme is the significant impact of age on female fertility, specifically egg quantity and quality.
• Ovarian Reserve: The total number of eggs a woman has, which declines with age.
• Egg Quality: The chromosomal health of an egg, which also deteriorates with age.
• Ovarian Reserve Testing: Methods to assess egg quantity, including FSH, AFC, and AMH.
• Egg Freezing: A procedure to preserve eggs for future use.
• Infertility: The inability to conceive, defined by time and other factors.
• Reproductive Health: The overall well-being related to reproduction.

The Evolving Conversation Around Fertility

The video argues for a shift in how fertility is discussed, moving beyond the sole focus on preventing pregnancy in young women to include a comprehensive understanding of how fertility changes with age. While fertility is at its peak in youth, this reality shifts significantly, particularly after the age of 35. The speaker, a fertility doctor, aims to dispel myths that age is not a major factor and that fertility treatments can fully counteract aging's effects. The core message is that proactive understanding and informed decision-making are crucial for reproductive health.

Understanding Infertility and the Role of Age

Infertility, defined by the World Health Organization as affecting one in six people globally, is a common medical condition. Traditionally, it was defined as the inability to conceive after 12 months of unprotected intercourse. However, the American Society of Reproductive Medicine now uses a broader definition that includes age, medical history, and the need for medical intervention.

Age is identified as the most critical factor influencing fertility in individuals with ovaries. This is due to a decline in both egg quantity and egg quality as a woman ages, leading to lower pregnancy rates and higher miscarriage rates, especially after 35.

Egg Quantity: A Finite Resource

An individual with ovaries is born with all the eggs they will ever possess. The peak number of eggs, between 6 to 7 million, occurs during fetal development. This number significantly decreases by birth (1-2 million), puberty (300,000-500,000), age 37 (approximately 25,000), and by the average age of menopause in North America (around 51), only about a thousand eggs remain.

Each month, one immature egg matures for ovulation, but many others are lost through a natural process of attrition. This monthly loss of approximately 1,000 immature eggs explains the drastic decline in egg numbers over time.

Measuring Ovarian Reserve

Ovarian reserve, or egg quantity, can be assessed through several key tests:

• FSH (Follicle-Stimulating Hormone): A hormone from the brain that signals the ovaries to mature an egg. Lower FSH levels at the start of a menstrual cycle generally indicate a good ovarian reserve.
• AFC (Antral Follicle Count): An ultrasound assessment of the number of immature eggs visible on the surface of the ovary at the beginning of a menstrual cycle. A higher count suggests a greater egg reserve.
• AMH (Anti-Müllerian Hormone): A hormone produced by the cells surrounding the eggs. Higher AMH levels in the blood correlate with more eggs in the ovaries. AMH is likened to a "fuel gauge" for fertility.

Ideal results for ovarian reserve testing would be a lower FSH and higher AFC and AMH.

It is crucial to understand the limitations of these tests:

• They indicate egg quantity relative to age and predict response to fertility medications.
• They do not confirm fertility status, provide an exact egg count, predict the exact time fertility will be compromised, or assess egg quality.

Egg Quality: The Impact of Age

Egg quality refers to the number of chromosomes within an egg. A healthy egg contains 23 chromosomes, which, when combined with a healthy sperm, form an embryo with 46 chromosomes. Chromosomes carry genetic information.

Age is the primary determinant of egg quality. As women age, the proportion of eggs with an abnormal number of chromosomes increases. These eggs can lead to:

• No fertilization.
• Implantation problems.
• Miscarriage.
• Chromosomal disorders in offspring.

The analogy used is fresh fruit: abundant and fresh when young, but less available and of lower quality (overripe) as time passes. While lifestyle factors, environmental exposures, medical conditions (like endometriosis), and treatments (like chemotherapy) can affect egg quality, age remains the most significant factor. Currently, there are no specific tests to directly measure egg quality; age serves as the best indicator.

Proactive Fertility Planning and Egg Freezing

Understanding ovarian reserve provides insights into egg quantity relative to age and potential outcomes for fertility treatments like egg freezing or in vitro fertilization (IVF). Recognizing the impact of age on egg quality encourages timely fertility testing and treatment.

The video suggests that individuals in their late 20s or early 30s, especially those not planning immediate pregnancy, could benefit from consulting a fertility specialist. Early assessment allows for understanding one's fertility status and exploring options like egg freezing.

Egg freezing is presented as a tool for "reproductive flexibility," enabling individuals to preserve fertility for later in life when egg quality and quantity may be diminished. The process involves ovarian stimulation, egg retrieval, and freezing for future use.

However, egg freezing is not a guarantee of a future child. Some eggs may not survive thawing, fertilization, embryo development, implantation, or result in a pregnancy. Despite these caveats, it remains a valuable option.

The decision to freeze eggs involves balancing the benefits of preserving younger, higher-quality eggs against the costs and risks of the medical procedure. Freezing in the late 20s or early 30s is suggested as a balance point for many. Starting to consider fertility in the early 20s, alongside educational and career planning, is also recommended as a wise initial step.

Empowering Informed Decisions

The video highlights real-life scenarios of individuals who might benefit from fertility testing and potential egg freezing: a 30-year-old medical resident, a 36-year-old finance executive, and a 34-year-old who recently ended a long-term relationship. These examples illustrate how life stages and career pursuits can influence family planning timelines.

The overarching message is that education about fertility, particularly the impact of age, should begin earlier and be accessible to all women and individuals with ovaries, not just those actively trying to conceive and facing difficulties. Informed individuals are empowered to make the best choices for their future reproductive health. The video encourages conversations with primary care providers about fertility and reproductive health goals, emphasizing that knowledge is the first step towards making informed decisions.