SHBG and TRT: what your lab result actually means
Quick answer
SHBG is a serum glycoprotein that binds testosterone with high affinity, reducing its bioavailability. In men presenting with hypogonadal symptoms but borderline total testosterone, measuring SHBG to calculate free or bioavailable testosterone is supported by Endocrine Society guidelines (Bhasin et al., 2018). However, SHBG continues to influence free testosterone interpretation throughout TRT and can shift due to age, liver function, thyroid status, and route of testosterone administration, making it a clinically relevant variable beyond initial diagnosis.
Our take · Written by FormBlends editorial team · Reviewed by FormBlends Medical Team· This is not a transcript. It is our independent review of the video above.
What did @socalurologyinstitute actually say?
The creator, presenting as a urologist, argued that SHBG has one primary job: helping clinicians make the right diagnosis when a man has a normal-looking total testosterone but still feels terrible. Once someone starts TRT, he said, "it is what it is" and SHBG is not really actionable. He also stated that "SHBG is what it is" and that strategies to lower it are not well-supported. He framed SHBG elevation as part of normal aging that sometimes requires simply adding more testosterone to compensate.
To his credit, the framing around free testosterone and diagnosis is clinically grounded. Men with total testosterone in the "normal" range but high SHBG can have genuinely low bioavailable testosterone, and this is a real diagnostic gap that standard panels miss. That part of his argument holds up.
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Cardiovascular Safety of Testosterone-Replacement Therapy
TRAVERSE trial anchor for cardiovascular-safety discussions in appropriately diagnosed men.
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Testosterone therapy in men with androgen deficiency syndromes: an Endocrine Society clinical practice guideline
Guideline anchor for diagnosis, monitoring, contraindications, and appropriate TRT framing.
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SHBG is a serum glycoprotein that binds testosterone with high affinity, reducing its bioavailability.
FormBlends verdict
SHBG is a serum glycoprotein that binds testosterone with high affinity, reducing its bioavailability. In men presenting with hypogonadal symptoms but borderline total testosterone, measuring SHBG to calculate free or bioavailable testosterone is supported by Endocrine Society guidelines (Bhasin et al., 2018). However, SHBG continues to influence free testosterone interpretation throughout TRT and can shift due to age, liver function, thyroid status, and route of testosterone administration, making it a clinically relevant variable beyond initial diagnosis.
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What it helps with
- SHBG is a serum glycoprotein that binds testosterone with high affinity, reducing its bioavailability. In men presenting with hypogonadal symptoms but borderline total testosterone, measuring SHBG to calculate free or bioavailable testosterone is supported by Endocrine Society guidelines (Bhasin et al., 2018). However, SHBG continues to influence free testosterone interpretation throughout TRT and can shift due to age, liver function, thyroid status, and route of testosterone administration, making it a clinically relevant variable beyond initial diagnosis.
- The Endocrine Society 2018 guidelines (Bhasin et al.) recommend measuring free or bioavailable testosterone in men with borderline total testosterone and symptoms, supporting the creator's diagnostic framing.
- Free testosterone predicted symptom improvement in hypogonadal men on TRT more reliably than total testosterone in Goldman et al. (2020, Andrology), meaning SHBG keeps mattering after diagnosis.
What it may miss
- It may not cover eligibility, contraindications, medication interactions, lab history, or dose escalation.
- Compound access, legal status, and product quality still need a separate safety check.
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Start provider reviewWhat You'll Learn
- The Endocrine Society 2018 guidelines (Bhasin et al.) recommend measuring free or bioavailable testosterone in men with borderline total testosterone and symptoms, supporting the creator's diagnostic framing.
- Free testosterone predicted symptom improvement in hypogonadal men on TRT more reliably than total testosterone in Goldman et al. (2020, Andrology), meaning SHBG keeps mattering after diagnosis.
- SHBG rises roughly 1-2% per year with aging (Harman et al., 2001, JCEM), which is why some men need TRT dose adjustments over time even without major lifestyle changes.
- Boron supplementation to lower SHBG showed only modest effects in a small study (Naghii et al., 2011) and lacks strong replication. Treating it as a reliable strategy is not evidence-based.
- Elevated SHBG can be a downstream marker of thyroid dysfunction or liver disease. Dismissing it as unchangeable without ruling out secondary causes is not best practice.
- Route and frequency of testosterone administration affect SHBG differently. Injections and topical formulations do not produce identical SHBG responses, a nuance the video skips entirely.
- If you are on TRT and still symptomatic, asking your provider to calculate free testosterone using your current SHBG level is a reasonable, guideline-supported conversation to have.
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About the Creator
Dr Gary Bellman | SoCalUrology · TikTok creator
12.0K views on this video
Should I worry about my SHBG level? #trt #shbg #hormonereplacementtherapy #trtcommunity #fyp
Read More on This Topic
Our written guides go deeper with dosing details, comparison tables, and medical-team reviewed protocols.
Not medical advice. This video was made by Dr Gary Bellman | SoCalUrology, not by FormBlends. Our write-up above is an editorial review, not a medical recommendation. Talk to your doctor before making any decisions about medications or treatments.