The Complete Men's Health Blood Panel
What to test, what the numbers actually mean, and what to do next.
Bloodwork is the foundation of every men's health decision. Before you start TRT, before you try a GLP-1 medication, before you assume your ED is caused by stress or your fatigue is caused by aging — you need data. The right blood panel tells you exactly what's happening in your body and eliminates the guesswork that wastes time and money.
The problem is that most men either don't get the right tests, or they get results that say "normal" when their numbers are actually far from optimal. Lab reference ranges are based on the entire population — including sick, obese, and elderly men. A testosterone level of 280 ng/dL is "normal" by many lab standards, but it may explain why a 35-year-old feels like he's running on empty.
This guide covers every marker that matters for men's health, what optimal ranges look like (not just "normal"), and what each result tells you about your next steps.
The Hormonal Panel
Total Testosterone
The headline number. Total T measures all testosterone in your blood — bound to SHBG, bound to albumin, and free. It's the first test any provider orders and the one insurance companies use to determine TRT eligibility.
Optimal range: 500–900 ng/dL for most men under 60
Clinically low: Below 300 ng/dL (Endocrine Society threshold)
Context matters. A man at 310 ng/dL is technically "normal" but may have significant symptoms. A man at 480 ng/dL with high SHBG may have very little usable testosterone. Total T alone doesn't tell the full story — which is why free testosterone matters.
Deep dive on testosterone levels and what affects them: TrueTRT.co.
Free Testosterone
Only 2–3% of your total testosterone circulates unbound ("free") and available for your tissues to use. The rest is locked up by SHBG and albumin. You can have a total T of 500 and still be functionally low if your SHBG is sky-high.
Optimal range: 10–20 ng/dL for men under 50
Low: Below 6.5 ng/dL
Free T is arguably more clinically meaningful than total T. If your total T looks reasonable but your symptoms are significant, low free T is often the explanation.
SHBG (Sex Hormone-Binding Globulin)
SHBG binds testosterone, making it unavailable for use. High SHBG means less free T regardless of total T. Low SHBG means more free T but also faster testosterone clearance. SHBG is affected by liver function, thyroid status, obesity, and medications.
High SHBG (>50): Common in older men, hyperthyroidism, liver disease; reduces free T
Low SHBG (<20): Common with obesity, insulin resistance, type 2 diabetes
Obese men often have low SHBG and low total T, a double hit to free testosterone. Weight loss typically normalizes SHBG. This is another reason the metabolic picture matters: see our guide on how weight loss improves hormonal health.
Estradiol (E2)
The primary estrogen in men. Produced mainly through aromatase conversion of testosterone in fat tissue. Too high causes gynecomastia, water retention, mood changes, and can worsen ED. Too low causes joint pain, bone loss, and libido issues. Balance is the goal.
Optimal range: 20–35 pg/mL (sensitive LC/MS/MS assay recommended)
Elevated: >40 pg/mL — common with obesity or on TRT without management
If your estradiol is elevated alongside low T, aromatase in visceral fat is the likely driver. Weight loss addresses this directly. For more on the testosterone-estrogen balance, see Estrogen in Men: The Hidden Hormone.
Prolactin
Elevated prolactin suppresses GnRH, which suppresses testosterone production and can directly cause ED, reduced libido, and even galactorrhea (breast discharge) in men. Causes include certain medications (antipsychotics, SSRIs), stress, and rarely pituitary adenomas.
Elevated: >25 ng/mL warrants investigation
Significantly elevated: >100 ng/mL — pituitary imaging recommended
Prolactin is often overlooked in standard panels but is critical for men with ED and low T that doesn't respond to treatment. If your prolactin is elevated, fixing it often resolves the testosterone deficit without TRT.
Thyroid Panel (TSH, Free T3, Free T4)
Thyroid dysfunction mimics many symptoms of low testosterone — fatigue, weight changes, mood disturbance, sexual dysfunction. Both hypothyroidism (underactive) and hyperthyroidism (overactive) affect erectile function and testosterone metabolism.
Free T4: 0.8–1.8 ng/dL
Free T3: 2.3–4.2 pg/mL
A TSH of 4.0 is "normal" by lab standards but may indicate subclinical hypothyroidism. If you have symptoms that don't fully respond to testosterone treatment, thyroid function is the next place to look. AntiAgingBrain.com covers cognitive and metabolic biomarkers in depth.
The Metabolic Panel
Fasting Glucose and HbA1c
Insulin resistance is the metabolic engine behind the obesity → low T → ED cycle. Fasting glucose captures a snapshot; HbA1c shows your average blood sugar over 2–3 months.
Prediabetic: 100–125 mg/dL
HbA1c optimal: Below 5.5%
Prediabetic: 5.7–6.4%
Men with prediabetes are at significantly elevated risk for both low testosterone and ED. GLP-1 medications address insulin resistance directly alongside weight loss — GLP-1Men.com covers the metabolic benefits for men specifically.
Lipid Panel (Total Cholesterol, LDL, HDL, Triglycerides)
Cardiovascular risk and erectile function are intimately connected. ED is often called an early warning system for cardiovascular disease — penile arteries are among the smallest in the body, so they show damage first.
HDL optimal: Above 50 mg/dL (higher is better)
Triglycerides optimal: Below 100 mg/dL
Total cholesterol: Below 200 mg/dL
Elevated triglycerides plus low HDL is the metabolic syndrome pattern that strongly correlates with ED and low T. It's also the pattern that responds best to weight loss.
Safety and Monitoring Markers
PSA (Prostate-Specific Antigen)
Essential baseline before any hormonal treatment. TRT does not cause prostate cancer (the TRAVERSE trial confirmed this), but it can stimulate growth of pre-existing prostate cancer. You need a baseline to compare against.
Optimal baseline: Below 2.0 ng/mL for men under 50
Hematocrit and CBC
TRT stimulates red blood cell production. Elevated hematocrit (blood thickness) increases clotting risk. This is the most common reason men on TRT need dose adjustments or therapeutic blood donation.
On TRT — concerning: Above 52%
On TRT — requires intervention: Above 54%
Vitamin D
Vitamin D deficiency is correlated with low testosterone in multiple studies, and supplementation in deficient men has shown modest testosterone improvements. It also affects mood, energy, and bone density.
Optimal: 50–80 ng/mL
Deficient: Below 30 ng/mL
DHEA-S
DHEA-S is a precursor hormone produced by the adrenal glands. Low levels can indicate adrenal insufficiency and are associated with fatigue and low libido independent of testosterone. It declines with age more predictably than testosterone.
Low: Below 100 mcg/dL warrants investigation
Where to Get Tested
You have several options for getting a comprehensive men's health panel:
Through a telehealth platform: Many men's health platforms include lab work as part of their initial evaluation. PeterMD includes comprehensive lab panels in their TRT and multi-condition programs. Sesame Care offers affordable wellness consultations that can include lab orders.
Through your primary care doctor: Request a "comprehensive men's health panel" and specifically ask for free testosterone (not just total), estradiol via the sensitive LC/MS/MS assay, and SHBG. Many PCPs only order total T by default.
Direct-to-consumer labs: Services like Quest, Labcorp, and others allow you to order panels directly without a doctor's order in most states. Expect to pay $150–$400 out of pocket for a comprehensive panel.
Get a Men's Health Evaluation →What to Do With Your Results
Once you have your numbers, use our treatment sequencing guide to determine your best next step based on the pattern your bloodwork reveals.
If your results show low testosterone with obesity and metabolic dysfunction, weight loss is the evidence-based first step. If they show primary hypogonadism with normal metabolic markers, TRT may be appropriate. If they reveal a thyroid issue or elevated prolactin, treating those first may resolve your symptoms without hormonal intervention.
The bloodwork tells the story. Everything else follows from the data.
Medical Disclaimer: This article is for informational purposes only and does not constitute medical advice. Lab ranges provided are general guidelines; your healthcare provider should interpret results in the context of your individual health history, symptoms, and clinical picture.
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