You had your blood drawn. The results came back. And now you are staring at a page of numbers, abbreviations, and reference ranges trying to figure out what any of it actually means. Hormone lab results are genuinely confusing, not because the biology is impossibly complex, but because the way results are reported was designed for clinicians, not patients. The difference between “your testosterone is in range” and “your testosterone is in the range where most men your age feel well” is clinically enormous, but most lab reports do not make that distinction.
This guide explains the most important hormone markers, what each one actually measures, how to read your results in context rather than just comparing to a reference range, and what questions to ask when your numbers look borderline. For a full overview of what happens at the appointment where these labs are ordered and reviewed, see our article on what to expect at your first hormone therapy appointment.
Key principle
Reference ranges on lab reports show where 95% of the tested population falls — not where you feel your best, not an optimal target, and not an individually calibrated number. A result can be technically “normal” and still represent a meaningful deficiency for a specific person. Understanding the difference between a population reference range and a clinical target range is the single most important concept in reading hormone labs.
Why “Normal” on a Lab Report Does Not Mean Optimal
Standard laboratory reference ranges are established by collecting results from a large population sample and identifying the values that capture 95% of results. This means that 2.5% of completely healthy individuals will fall below the “normal” range and 2.5% will fall above it — purely based on statistical definition, not biological function. More importantly, the population used to establish the range may include unhealthy individuals, people with subclinical conditions, and people of widely varying ages lumped into a single bracket.
For hormone testing specifically, this creates three practical problems. First, the ranges are often very wide, capturing such a broad population that a result near the bottom of “normal” and a result near the top represent entirely different hormonal states. Second, the ranges are often not age-adjusted in ways that reflect individual biology. A 45-year-old man with the testosterone level of the average 75-year-old in the reference population is technically “normal” but clinically deficient for his age. Third, a person’s individual baseline matters: if your testosterone was 750 ng/dL at age 35 and is now 310 ng/dL at age 45, you have lost 60% of your testosterone, but a lab report will call both values “normal.”
Reference range vs optimal range
Many specialist clinics use target ranges that differ from standard laboratory reference ranges. For example, standard laboratory reference ranges for total testosterone in men are often listed as 264 to 916 ng/dL. A hormone specialist treating a 42-year-old man with symptoms of deficiency might target 600 to 900 ng/dL as a clinical goal, regardless of where the standard range begins. Understanding which range your provider is using, and why, is essential for interpreting your results meaningfully.
Testosterone: Total, Free, and SHBG
Testosterone results are the most frequently misread values on a hormone panel. The most common mistake is relying on total testosterone alone. Total testosterone measures all testosterone in the bloodstream, but most of it is bound to proteins and biologically inactive. Only free testosterone, the unbound fraction that can actually enter cells and activate androgen receptors, determines what your body experiences. Understanding all three values together is essential.
Understanding Your Testosterone Panel
Marker
What it measures
Typical range
What to watch
Total testosterone
All T in blood, bound and unbound
Men: 264–916 ng/dL Women: 15–70 ng/dL
Alone, it is insufficient. Always review with free T and SHBG.
Free testosterone
Unbound T available to cells and receptors
Men: 5–21 ng/dL Women: 0.3–2.0 ng/dL
The most clinically relevant value. Symptoms correlate better with free T than total T.
SHBG
Protein that binds and inactivates testosterone
Men: 10–57 nmol/L Women: 18–114 nmol/L
High SHBG means less free T even when total T looks fine. Common with thyroid issues and oral estrogen.
Estradiol (E2)
Estrogen derived from testosterone conversion (aromatization)
Men: 10–40 pg/mL Women (premenopause): 30–400 pg/mL
Men with high E2 relative to T experience low libido, mood changes, water retention. Essential to check on TRT.
The most common clinical scenario is a man with total testosterone of 350 ng/dL, free testosterone of 4.2 ng/dL, and SHBG of 58 nmol/L. His total testosterone is within the standard reference range. His free testosterone is not, and the reason is high SHBG binding most of his total testosterone before it can reach tissue receptors. Without the SHBG result, the picture looks normal. With it, the deficiency is clear. For more on how testosterone deficiency is evaluated and diagnosed, see our article on understanding testosterone deficiency.
LH and FSH: Reading the Pituitary Signal
LH (luteinizing hormone) and FSH (follicle-stimulating hormone) are produced by the pituitary gland and tell the gonads to produce sex hormones. These two values tell you not just whether sex hormone levels are low, but why they are low — which fundamentally changes the treatment approach.
In men, LH signals the testes to produce testosterone and FSH stimulates sperm production. In women, LH and FSH regulate the ovarian cycle and estrogen and progesterone production. Reading these values alongside sex hormone levels reveals the location of the problem:
Low testosterone + high LH/FSH = primary hypogonadism. The pituitary is sending the right signal but the gonads are not responding. The problem is in the testes or ovaries.
Low testosterone + low or normal LH/FSH = secondary hypogonadism. The pituitary is not sending enough signal. The problem is in the brain, pituitary, or hypothalamus. This pattern is important for men under 40 because it may indicate elevated prolactin, stress-related suppression, or pituitary dysfunction.
High FSH in women = declining ovarian reserve or perimenopause. FSH rises as the pituitary works harder to stimulate increasingly unresponsive ovaries.
Normal LH and FSH with low sex hormones = often indicates pituitary dysfunction or chronic suppression (stress, medications, or ongoing illness).
Prolactin: The Most Missed Marker on a Standard Panel
Prolactin is a pituitary hormone primarily known for its role in lactation, but in both men and women, elevated prolactin suppresses sex hormone production by inhibiting GnRH at the hypothalamus. Prolactin elevation (hyperprolactinemia) is one of the most commonly missed causes of low libido, low testosterone in men, menstrual irregularity in women, and unexplained fatigue.
Normal prolactin in men is below 20 ng/mL and in women below 25 ng/mL (outside pregnancy and breastfeeding). Mildly elevated prolactin (up to 50 ng/mL) may reflect acute stress, recent sexual activity, or blood draw stress. Significantly elevated prolactin (above 100 ng/mL) warrants investigation for a pituitary adenoma (prolactinoma), which is the most common pituitary tumor and is highly treatable. Any single elevated prolactin result should be confirmed with a repeat fasted morning draw before any treatment decisions are made, since prolactin is highly sensitive to acute stressors.
Tip: when to redraw prolactin
Prolactin should be drawn in the morning, fasted, at least 2 hours after waking (not immediately after waking, as prolactin is elevated during sleep). Avoid sexual activity and vigorous exercise in the 24 hours before your draw. A stress-free, quietly seated blood draw produces the most accurate result. If your first prolactin comes back mildly elevated, request a repeat before any treatment changes are made.
The Thyroid Panel: Why TSH Alone Is Not Enough
Thyroid function is the most commonly tested and most commonly misinterpreted part of a hormone panel. The standard primary care approach measures only TSH (thyroid-stimulating hormone). While TSH is a useful screening tool, relying on it alone misses a significant subset of people with functional hypothyroidism whose TSH is “normal” but whose actual thyroid hormone availability at the tissue level is inadequate.
Understanding Your Full Thyroid Panel
Marker
What it measures
Standard range
Clinical context
TSH
Pituitary signal to the thyroid gland
0.5–4.5 mIU/L
High TSH = thyroid not producing enough hormone. Many clinicians target 1.0–2.5 mIU/L for symptomatic patients.
Free T4
Primary thyroid hormone produced by the gland
0.8–1.8 ng/dL
T4 must be converted to T3 to be active. Normal T4 with low T3 indicates a conversion problem.
Free T3
Active thyroid hormone that enters cells and drives metabolism
2.3–4.2 pg/mL
Most important for metabolic rate and symptom correlation. Low free T3 with normal TSH is a common missed finding.
Reverse T3
Inactive T3 isomer that blocks T3 receptors
9.2–24.1 ng/dL
Elevated in chronic stress, severe calorie restriction, and illness. Blocks free T3 even when free T3 is technically adequate.
TPO Antibodies
Immune attack against the thyroid gland
Below 35 IU/mL
Elevated in Hashimoto’s thyroiditis. Can be present for years before TSH becomes abnormal.
A complete thyroid panel should include at minimum: TSH, free T4, and free T3. Adding reverse T3 and TPO antibodies provides the most complete picture for patients with persistent symptoms despite “normal” TSH.
Cortisol: Reading Your Adrenal Function
Cortisol is the body’s primary stress hormone, produced in a diurnal pattern that peaks sharply in the early morning (between 6 and 9 AM) and declines throughout the day to its lowest point at night. A single morning cortisol reading gives a snapshot of this peak, which is why timing of the blood draw is critical. A cortisol drawn at 2 PM will look artificially low even in someone with normal adrenal function.
Normal morning cortisol ranges from approximately 6 to 23 mcg/dL. Values below 6 mcg/dL in a morning draw suggest adrenal insufficiency and warrant further investigation with a stimulation test. Values at the very high end of normal (above 20 mcg/dL) in a patient with central obesity, sleep disruption, and mood changes suggest chronically elevated cortisol as a clinical driver rather than just a stress response. Cortisol directly suppresses testosterone, disrupts thyroid T4-to-T3 conversion, and promotes visceral fat storage. The interaction between cortisol and other hormones means it must be interpreted alongside the rest of the panel, not in isolation. For a detailed explanation of how cortisol drives belly fat accumulation, see our article on the cortisol and belly fat connection.
IGF-1: Your Growth Hormone Proxy
Growth hormone (GH) cannot be reliably measured with a single blood draw because it pulses throughout the day with the largest release occurring during deep sleep. IGF-1 (insulin-like growth factor 1), produced by the liver in response to GH signaling, remains stable throughout the day and accurately reflects the cumulative GH output over the preceding 24 hours. IGF-1 is therefore the standard proxy for growth hormone status in clinical practice.
IGF-1 reference ranges are age-stratified because natural GH output declines with age. A result that is “normal for a 60-year-old” may represent a meaningful decline for a 40-year-old. Hormone specialists typically target the upper half of the age-appropriate range as a clinical goal for patients with GH-related symptoms, rather than simply confirming the result is within range. For context on how IGF-1 is used to guide HGH therapy dosing and monitoring, and what the expected timeline of changes looks like, see our article on how long before HGH therapy shows results. For a comparison with low testosterone symptoms see our article on GH deficiency vs low testosterone.
IGF-1 age-appropriate targets
IGF-1 ranges by age decade (approximate): ages 20 to 30: 180 to 340 ng/mL. Ages 30 to 40: 150 to 290 ng/mL. Ages 40 to 50: 120 to 250 ng/mL. Ages 50 to 60: 100 to 220 ng/mL. Ages 60 and over: 80 to 180 ng/mL. A 45-year-old with an IGF-1 of 90 ng/mL is technically within the reference range for their decade but falls in the lower quartile associated with fatigue, reduced body composition, and cognitive decline in clinical studies. The goal of treatment is restoration to the upper half of the age-appropriate range.
Metabolic Markers: Insulin, Glucose, and HbA1c
Insulin resistance is both a cause and consequence of hormonal imbalance. Chronically elevated insulin suppresses testosterone, impairs GH pulsatility, and drives visceral fat accumulation. Yet fasting insulin is not included on most standard metabolic panels, leaving the diagnosis of early insulin resistance invisible until it progresses to prediabetes or type 2 diabetes. A comprehensive hormone panel should always include both fasting glucose and fasting insulin, from which HOMA-IR (a validated insulin resistance index) can be calculated.
Key Metabolic Markers and What They Tell You
Fasting glucose
Optimal: below 90 mg/dL Prediabetes: 100–125 mg/dL. “Normal” up to 99 mg/dL but values 90–99 with elevated insulin suggest early insulin resistance.
Fasting insulin
Optimal: below 8 mcIU/mL Standard “normal” goes to 25 mcIU/mL — but 15–25 mcIU/mL in a fasted patient already indicates significant insulin resistance. Not on most panels. Request specifically.
HOMA-IR
Formula: (Glucose × Insulin) ÷ 405 Below 1.0 = excellent insulin sensitivity. 1.0–2.0 = mild resistance. Above 2.5 = significant resistance. Calculate from your fasting glucose and insulin values.
HbA1c
Optimal: below 5.4% 3-month average of blood glucose. Prediabetes: 5.7–6.4%. Normal up to 5.6% but specialists target below 5.4% in optimization context.
Lipid panel
Watch triglycerides and HDL ratio Triglycerides above 150 mg/dL suggest insulin resistance. HDL below 40 mg/dL (men) or 50 mg/dL (women) is a risk marker. Low testosterone directly raises LDL and triglycerides.
CMP / Liver panel
Baseline before hormone therapy ALT and AST (liver enzymes) should be in normal range before initiating testosterone or HGH therapy. Elevated liver enzymes affect hormone metabolism and clearance.
Safety Markers: CBC, PSA, and Ferritin
Several markers on a hormone panel serve primarily as safety baselines rather than diagnostic tools. Understanding what they monitor protects you during treatment and flags issues before they become clinically significant.
CBC (Complete Blood Count) — Hematocrit and Hemoglobin
Testosterone stimulates red blood cell production. Hematocrit (the percentage of blood volume made up of red blood cells) must be monitored on testosterone therapy because excessively high hematocrit (above 52 to 54%) increases blood viscosity and clot risk. A baseline hematocrit before TRT and regular monitoring during treatment is standard protocol. Normal male hematocrit is 38.3 to 48.6%. Values approaching 50 to 52% on TRT require dose adjustment, increased hydration, or therapeutic phlebotomy.
PSA (Prostate-Specific Antigen) — Men Over 40
PSA is drawn as a baseline before initiating testosterone therapy in men over 40, not because TRT causes prostate cancer (the evidence does not support this), but because undiagnosed prostate cancer can be stimulated by rising testosterone. A baseline PSA allows monitoring for unexpected rises during treatment. Values below 4 ng/mL are generally considered normal, but rapid changes from one reading to the next are more clinically significant than any single absolute value.
Ferritin and Iron
Ferritin (stored iron) deficiency is a common and frequently missed contributor to fatigue, poor exercise recovery, and hair loss that overlaps symptomatically with many hormonal conditions. Normal ferritin ranges are broad (12 to 300 ng/mL in women, 12 to 400 ng/mL in men), but functional symptoms of iron deficiency are common at levels below 30 to 50 ng/mL. Confirming adequate ferritin before attributing fatigue entirely to hormonal causes is an important diagnostic step.
Common interpretation errors to avoid
Do not interpret any single marker in isolation. Low testosterone with normal LH can look like a minor abnormality until you add prolactin and find hyperprolactinemia. Normal thyroid TSH can hide severe free T3 deficiency from poor T4 conversion. A “normal” ferritin of 15 ng/mL in a woman with profound fatigue represents functional iron deficiency at the tissue level even though it is within range. Hormone labs should always be interpreted as a system, not as isolated individual values.
How to Read Your Results: A Practical Checklist
When your lab report arrives, work through it systematically rather than scanning for red flags. The following sequence produces the most clinically useful reading.
Note the draw time and conditions. Were you fasted? Was it a morning draw? Did you exercise the day before? These affect testosterone, cortisol, insulin, and prolactin significantly.
Never look at total testosterone in isolation. Always find free testosterone and SHBG on the same report. If free testosterone is not on your report, ask your provider to add it.
Check LH and FSH relative to your sex hormone results. Low sex hormones with high LH/FSH points to a gonadal problem. Low sex hormones with low LH/FSH points to a brain or pituitary problem.
Look at where your values fall within the range, not just whether they are in it. A value in the bottom 10% of a reference range with significant symptoms is clinically different from the same value without symptoms.
Calculate your HOMA-IR if fasting glucose and fasting insulin are both on your report. Most lab reports do not calculate this automatically.
Look for patterns that explain each other. High cortisol plus low free testosterone plus high reverse T3 is a recognizable hormonal stress pattern with a coherent treatment approach.
Identify what is missing. If your report does not include free T3, prolactin, fasting insulin, or DHEA-S, ask for a repeat draw with the full panel before any treatment decisions are made.
Frequently Asked Questions
My doctor says all my results are normal but I still feel terrible. What does that mean?
It most commonly means one of three things. First, the panel may be incomplete, missing key markers like free testosterone, free T3, prolactin, or fasting insulin. Second, your values may be in the lower quarter of a wide reference range that does not reflect where you as an individual function well. Third, there may be a pattern across multiple borderline values that each look fine in isolation but collectively point to a hormonal issue. A second opinion from a hormone specialist who reviews the full panel in the context of your symptoms often reveals what a standard primary care review misses.
What time of day should I get my hormone labs drawn?
Morning, between 7 and 10 AM, fasted (nothing but water for 10 to 12 hours). Testosterone peaks in the early morning and declines by 20 to 30% by early afternoon. Cortisol also peaks in the morning. Drawing labs in the afternoon or after eating can artificially lower both values and produce misleading low results. Prolactin should be drawn at least 2 hours after waking and after a calm, non-stressful period. For premenopausal women, the timing of the menstrual cycle also matters for estradiol and progesterone accuracy.
Do I need to stop any medications before my hormone labs?
Several medications significantly affect hormone lab results and should be discussed with your ordering provider before your draw. Oral contraceptives and hormonal IUDs raise SHBG and suppress free testosterone in women. Biotin supplements above 5 mg/day interfere with many immunoassay hormone tests. Corticosteroids suppress HPA axis function and affect cortisol, DHEA, and testosterone results. Some antidepressants, particularly SSRIs, raise prolactin. Do not stop any medication without your provider’s guidance, but do bring a complete medication and supplement list to your appointment so these interactions can be accounted for in interpretation.
What is the difference between total testosterone and free testosterone on a lab report?
Total testosterone measures all testosterone in the bloodstream including the fraction bound to SHBG (about 60%) and the fraction loosely bound to albumin (about 38%). Only the unbound free fraction, approximately 1 to 3% of total testosterone, is biologically active and available to enter cells. Free testosterone is therefore the more clinically meaningful number for symptom correlation. A person with total testosterone of 500 ng/dL and high SHBG may have a free testosterone of 5 ng/dL — which is functionally deficient despite a seemingly normal total. Free testosterone is not always included on standard panels. Request it specifically if it is not already ordered.
How often should I get hormone labs after starting treatment?
The standard monitoring schedule for most hormone therapies is: first follow-up labs at 4 to 6 weeks after initiation to confirm levels are in the therapeutic range and guide dose adjustment. Then at 3 months for a comprehensive review. Then every 6 months in the first year, and annually thereafter once stable. Men on testosterone therapy should have hematocrit checked at every draw. PSA should be checked annually in men over 40 on TRT. IGF-1 for patients on HGH therapy or Sermorelin should be checked at 4 to 6 weeks and with any dose change.
What does a high DHEA-S result mean?
DHEA-S (dehydroepiandrosterone sulfate) is produced by the adrenal glands and serves as a precursor to both testosterone and estrogen. It declines with age and is sometimes used as a marker of adrenal reserve. In most adults presenting to a hormone clinic, the concern is low DHEA-S rather than high. Significantly elevated DHEA-S in the absence of supplementation warrants investigation for adrenal pathology including adrenal hyperplasia or, rarely, adrenal tumors. In women, elevated DHEA-S alongside elevated testosterone and irregular periods suggests PCOS and should prompt a full androgenic and metabolic workup.
Should I test hormones at home or in a clinical lab?
Home finger-prick tests (saliva or dried blood spot) for hormones have limitations that clinical serum draws do not share. Saliva cortisol testing has some evidence for daily pattern mapping, but salivary testosterone and thyroid values are less standardized and harder to interpret against clinical reference ranges established from serum. For initial evaluation and for monitoring during treatment, a morning fasted serum draw through a clinical laboratory provides the most accurate, reproducible, and clinically interpretable results. Home tests can be useful for daily cortisol pattern assessment but should not replace serum panels for diagnosis or treatment decisions.
What if my labs are borderline and my doctor does not want to treat?
Borderline labs with significant symptoms are exactly the scenario where a hormone specialist consultation adds the most value. General practitioners are trained to treat laboratory abnormalities, not to optimize individuals within a broad normal range. A hormone specialist will interpret your labs in the context of your symptom burden, your individual baseline, your age-related expectations, and whether other hormonal patterns on the panel support a clinical intervention. A second opinion in this situation frequently changes the clinical picture and the treatment plan. See our article on what to expect at a hormone therapy consultation for how to prepare.
Have your labs and want a proper interpretation?
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This article is for informational and educational purposes only. Reference ranges cited are representative of common clinical laboratory standards and may vary between laboratories. Hormone lab interpretation requires individual clinical assessment by a licensed healthcare provider. No value or pattern described in this article should be used to self-diagnose or to modify your treatment without provider guidance. If you are experiencing symptoms associated with hormonal imbalance, consult a licensed provider for appropriate evaluation and testing.
