Thyroid Stimulating Hormone (TSH) Levels
Your individual optimal TSH is often narrower than the lab reference range. Someone who feels best at 1.0 will feel terrible at 3.5—even though both are "normal." Knowing your sweet spot ends years of being told "you're fine" when you're clearly not.
What this measures
How your DNA shapes thyroid stimulating hormone (tsh) levels.
TSH levels depend on the feedback loop between brain (hypothalamus, pituitary) and thyroid. TSHR (the TSH receptor on the thyroid), PDE8B (which regulates the cAMP signaling downstream of TSH), and TPO (thyroid peroxidase, which makes thyroid hormone) all shape baseline TSH set-point. Different people's "normal" TSH genuinely sits at different values.
Carriers of common PDE8B variants are associated with higher baseline TSH at any given level of thyroid hormone production — which can make their "normal" TSH look high even when free T4 and T3 are adequate. Carriers of TSHR variants are associated with altered TSH-thyroid signaling. The variants explain why some carriers feel best at TSH 1.0 and others at TSH 2.5.
Iodine is the essential substrate. Selenium supports TPO function. Adequate iron, zinc, and vitamin D all influence thyroid hormone production. Severe caloric restriction, chronic stress, and certain medications (lithium, amiodarone) all alter TSH. Bedtime estrogen exposure (in hormone replacement) raises TSH transiently.
A TSH of 3.5 isn't the same number across clients. Which PDE8B/TSHR/TPO variant pattern you carry decides whether your "in range" TSH actually feels good or whether a slightly lower or higher number is the better personal target — a conversation worth having with a thyroid-aware clinician.
Thyroid Stimulating Hormone (TSH) Levels is one specific finding in this system. Your Genomic Lifestyle Optimization Report shows where your variants place you on the hormone health spectrum — and what you can do about it.
In your report
Where Thyroid Stimulating Hormone (TSH) Levels lives inside your Genomic Lifestyle Optimization Report.
Thyroid Stimulating Hormone (TSH) Levels renders as a dark-background card with a color marker calibrated to your specific variants. The card opens with the gene mechanism, shows your result at a glance via that marker, and closes with a practical, mechanism-led recommendation — what to eat, what to time, what cofactors to support.
Want to see what a real Mosaic dark card looks like? Walk through a sample report →
In context
Thyroid: the 4-insight cluster.
Thyroid Stimulating Hormone (TSH) Levels is one finding in a tightly-related cluster. Mosaic sequences the other 3 alongside it so you see the whole biology — not an isolated data point.
- Autoimmune Thyroid RiskGenetic predisposition to Hashimoto's or Graves' varies widely. If you're in the higher-risk group, early antibody monitoring can catch the process years before full disease expression—when lifestyle interventions still have leverage.
- DIO1 ActivityDIO1 handles the body-wide conversion of inactive T4 into active T3. Reduced activity is a common reason for persistent hypothyroid symptoms—fatigue, weight gain, cold intolerance—even when TSH looks "normal." Standard testing misses this entirely.
- DIO2 ActivityDIO2 produces T3 specifically in the brain and muscles. Low activity is one of the most common causes of brain fog and cold hands on standard thyroid treatment that looks fine on paper. If your labs are normal but you still feel terrible, this is often why.
Questions people ask
About Thyroid Stimulating Hormone (TSH) Levels.
- How does my DNA influence thyroid stimulating hormone (tsh) levels?
- The DIO2 thyroid-conversion enzyme that turns inactive T4 into active T3. The COMT and CYP1A1 enzymes that move estrogen through Phase I detox. The SHBG variants that bind or release testosterone. The CYP17A1 and HSD3B2 nodes in the steroid synthesis cascade. Your "normal" labs may sit on top of a genome that needs a different intervention.
- What kind of test do I need to see my Thyroid Stimulating Hormone (TSH) Levels result?
- Whole-genome sequencing at 30× clinical depth. Consumer SNP-chip tests like 23andMe or AncestryDNA only read ~0.02% of your DNA and miss most of the variants this analysis needs. Mosaic reads all 3 billion base pairs and produces the full 108-insight report.
- How is Thyroid Stimulating Hormone (TSH) Levels different from clinical lab testing?
- Clinical labs measure downstream biomarkers — blood levels, hormone values, metabolic byproducts — at a single point in time. Genomic insights like Thyroid Stimulating Hormone (TSH) Levels reveal the underlying variant that shapes the biology, which is constant for life. The two are complementary: labs show the current snapshot; genomics shows the long-term tendency and where lifestyle leverage is highest.
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DIO2 Activity
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