Struggling to conceive — or experiencing the heartbreak of repeated miscarriages — is one of the most emotionally difficult journeys a person can face. If you’ve been through the standard fertility workup and been told everything looks ‘normal,’ or if you’re seeking additional answers before or alongside IVF, functional medicine offers a deeper layer of investigation that can make a meaningful difference.
What’s Really Behind Many Fertility Struggles
Infertility and recurrent pregnancy loss often involve multiple interacting factors rather than a single clear cause. Thyroid dysfunction — even subclinical hypothyroidism — is one of the most common and frequently overlooked contributors. The American Thyroid Association now recommends TSH below 2.5 mIU/L for women trying to conceive, yet many conventional labs flag results as normal up to 4.5 or higher.
Other critical contributors include: insulin resistance and PCOS (addressed separately), luteal phase deficiency with insufficient progesterone to sustain early pregnancy, autoimmune activity including antiphospholipid syndrome and anti-thyroid antibodies, MTHFR gene variants that impair folate metabolism and increase miscarriage risk, nutritional deficiencies in vitamin D, CoQ10, zinc, and B12, and environmental toxins — particularly heavy metals like mercury and lead — that interfere directly with reproductive hormone signaling and embryo development.
Why ‘Unexplained’ Infertility Often Has Explanations
Standard fertility workups typically evaluate ovarian reserve, fallopian tube patency, semen analysis, and basic hormones. This is important information — but it doesn’t capture thyroid antibodies, immune dysfunction, clotting factors, nutrient status, or toxic burden. Many patients with ‘unexplained infertility’ have one or more of these correctable underlying factors.
For recurrent miscarriage specifically, an investigation of hypercoagulability, immune activation, hormonal insufficiency in the second half of the cycle, and chromosomal factors is essential — and not all of these are standard in conventional protocols.
How I Approach Fertility from a Root-Cause Perspective
Preconception health is one of the highest-impact investments you can make for yourself and your future child. Here’s what I investigate:
- Full thyroid panel including TSH, free T3, free T4, reverse T3, and TPO and thyroglobulin antibodies
- Comprehensive sex hormone analysis: FSH, LH, estradiol, progesterone (day 21), AMH, and androgens
- MTHFR gene variant testing and homocysteine evaluation
- Antiphospholipid antibody panel and clotting factor assessment for recurrent miscarriage
- Vitamin D, ferritin, B12, zinc, CoQ10, and omega-3 index
- Heavy metal and environmental toxin screening
- Personalized preconception optimization protocols — ideally beginning 3-6 months before attempting conception
Book your new patient appointment with Dr. Jamie Ahn today.
