The Truth About Your Biological Clock: Egg Quality, AMH and Fertility with Dr. Natalie Crawford

Dr. Crawford emphasizes that cycle regularity alone is insufficient; the phases provide critical clues. A short luteal phase can indicate poor follicle quality or inadequate brain signaling, often from inflammation, thyroid issues, or over-exercise. A short follicular phase may signal diminishing ovarian reserve. She recommends wearables for their high-frequency temperature data, making tracking easier than traditional BBT. She also advises noting cervical mucus changes and using LH kits. The goal is to empower women to detect issues early and seek evaluation.

Dr. Crawford strongly advocates for routine AMH testing, contrary to ACOG guidelines. She argues that knowing one's ovarian reserve allows women to make informed decisions: try sooner, freeze eggs, or address underlying causes of low reserve (autoimmune, endometriosis, toxins). She also links low AMH to earlier menopause and associated health risks (osteoporosis, heart disease), enabling preventive care. She tells patients with AMH under 1 at age 30 that they will not reach menopause at 51-52 and should anticipate perimenopause in their 30s, allowing early hormone therapy consideration.

Dr. Crawford calls this 'trimester zero' and frames it as the opposite of the traditional 'just try and hope' approach. She explains that chronic inflammation damages eggs and sperm, and that the 3-month window aligns with the lifecycle of sperm and the final maturation of eggs. She emphasizes that men's sperm is highly sensitive to toxins like cannabis, which can increase DNA fragmentation and miscarriage risk even if the woman never uses it. The five pillars—sleep, stress, exercise, food, toxins—are levers to lower the inflammatory burden.

Dr. Crawford shares an anecdote of a physician friend who planned her wardrobe around heavy bleeding, only to discover fibroids. She stresses that periods should not disrupt life—you should be able to manage with over-the-counter products. Pain that prevents activities or intercourse is also abnormal. She links these symptoms to potential fertility-impacting conditions like endometriosis, which also causes inflammation.

Dr. Crawford highlights that one single decision—using cannabis—can significantly harm fertility. She notes that it's not the act of smoking but the THC itself causing inflammation and hormonal disruption. She often encounters pushback from men who say they used cannabis and had children, but emphasizes population-level risk, especially for older couples where time is critical.

Dr. Crawford groups sleep, stress, and exercise as the foundation of each day, noting that you make choices in all three whether you realize it or not. Food and toxins are additional layers. She emphasizes that this is not a checklist but an intentional approach to lower baseline inflammation, which becomes even more critical in perimenopause when estrogen's anti-inflammatory protection wanes.

Dr. Crawford shares her own story: at 41, peripheral neuropathy led to an MRI that prompted a DEXA, revealing osteopenia. This led to her celiac diagnosis. She argues that if she hadn't had that incidental finding, she would have gone undiagnosed until a fracture. She connects low AMH to earlier bone loss and urges women with low ovarian reserve to get baseline DEXA scans.

Dr. Crawford argues that withholding AMH testing from women who aren't actively trying to conceive robs them of agency. She notes that AMH costs $79 out-of-pocket and can reveal low ovarian reserve, which may prompt earlier family planning, egg freezing, or lifestyle changes. She also links low AMH to earlier menopause and associated health risks like osteoporosis and cardiovascular disease, enabling preventive care. She believes physicians should not be gatekeepers of body data.

Dr. Crawford explains that while no single choice guarantees pregnancy, cumulative lifestyle factors—diet, stress, sleep, toxins—create an inflammatory burden that damages eggs, sperm, and the brain-ovary communication. She uses the example of cigarette smoking, which is widely accepted as harmful, but argues that many other inflammatory exposures (like cannabis, poor diet, chronic stress) are similarly detrimental yet often dismissed. She emphasizes that knowledge about timing intercourse and understanding cycles also removes 'luck' from the equation.

She uses the analogy of chromosomes as kindergarteners held in line by proteins that weaken with age. At 30, ~60-70% of eggs are genetically normal; at 35, ~50%; at 38, 30-40%; at 40, 20-25%. Inflammation accelerates this breakdown. She also explains that ovarian reserve tests (AMH) reflect quantity, not quality, and that low AMH doesn't mean infertility but signals less time and a need for proactive measures. She stresses that there is no test for egg quality outside of IVF.

Dr. Crawford argues that chronic inflammation is the common thread: it causes infertility and also increases risks for other conditions. She insists that women deserve to know this connection so they can modify their health trajectory, even if they can't change the past infertility. She sees fertility as a 'health marker'—often the first red flag in a young woman's life that something is systemically off.