How does my DNA influence sex hormone binding globulin (SHBG) 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 Sex Hormone Binding Globulin (SHBG) 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 report, all 108 insights.

How is Sex Hormone Binding Globulin (SHBG) 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 Sex Hormone Binding Globulin (SHBG) 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.

Sex Hormone Binding Globulin (SHBG) Levels

One of 108 insights in your Genomic Lifestyle Optimization Report.

SHBG binds sex hormones and takes them out of circulation. High levels can mask what's really low bioavailable testosterone or estrogen, even when total levels look fine. This is the "hidden half" that standard hormone panels ignore.

See the reports See the Hormones area

How your DNA shapes sex hormone binding globulin (SHBG) levels.

SHBG is the protein that binds sex hormones (testosterone, estrogen) in circulation. Only the unbound (free) fraction is biologically active. The SHBG gene contains variants that shift baseline production. High SHBG ties up more testosterone and estrogen, reducing free hormone available to tissues; low SHBG leaves more free.

Carriers of SHBG rs1799941 and rs12150660 reduced-production variants are associated with lower SHBG levels, and proportionally more free testosterone and estrogen at the same total hormone levels. Carriers of higher-production variants are associated with the opposite pattern. The variant decides whether a "normal total testosterone" actually means normal free testosterone.

Insulin resistance lowers SHBG; weight loss raises it. Liver health affects SHBG production directly. Hormonal contraceptives raise SHBG meaningfully, sometimes enough to halve free testosterone, which explains some of the libido and energy changes reported on oral contraceptives. Thyroid status, alcohol, and certain medications all shift the picture.

A "normal total testosterone" report isn't the same conversation across SHBG variant patterns. Which SHBG variant you carry decides whether free hormone calculations (calculated free testosterone, bioavailable testosterone) matter in interpreting labs, and whether the right intervention is adjusting SHBG or adjusting total hormone production.

In your report, Sex Hormone Binding Globulin (SHBG) Levels is one dark card: a color marker set by your variants, the mechanism in plain language, and one practical next step.

Want to see real report pages? See the reports

Sex Hormones: the 6-insight cluster.

Sex Hormone Binding Globulin (SHBG) Levels is one finding in a tightly related cluster. Mosaic reads the other 5 alongside it, so you see the whole biology, not an isolated data point.

About Sex Hormone Binding Globulin (SHBG) Levels.

More from Hormones

Autoimmune Thyroid Risk

Genetic tendency toward Hashimoto's or Graves' varies widely. If you're in the higher-tendency group, it is worth knowing early and worth raising with your clinician, while lifestyle changes still have the most leverage.

Read insight

Cortisol Production

Some people run naturally high on cortisol; others trend low. Neither is inherently bad, but each benefits from different stress-management strategies. High producers need more active recovery; low producers may need adaptogen support. One-size-fits-all stress advice ignores this completely.

Read insight

Cortisol Receptor Sensitivity

Same cortisol level, very different felt experience. High receptor sensitivity means stress hits harder even when cortisol is "normal." This explains why some people thrive in chaos while others burn out, and it's not about being weak. It's about wiring.

Read insight

DIO1 Activity

DIO1 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.

Read insight

DIO2 Activity

DIO2 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.

Read insight

Dihydrotestosterone (DHT) Levels

DHT is the more potent downstream product of testosterone. High converters may see effects on hair loss, prostate health, or skin, and often want to know before symptoms show up. Low converters rarely need to worry about it.

Read insight

This is one of 108. Your report reads all of them, from one cheek swab.

See the real pages first. Then order your kit and the full Lifestyle Report lands in 15 to 20 days.

See the reports Order your kit