Two morning tests: what the Endocrine Society recommends before TRT
Before starting testosterone therapy, a clinic should confirm two things: that you have symptoms consistent with low testosterone, and that your total testosterone is low on at least two separate early-morning, fasting blood tests. That is the diagnostic standard in the Endocrine Society's 2018 clinical practice guideline. Once low testosterone is confirmed, the guideline adds LH and FSH to find the cause, plus baseline safety checks such as hematocrit and, depending on your age and risk, PSA.
If a clinic is ready to prescribe after one afternoon blood draw and a symptom quiz, it is not following that standard. Here is what each test does, why it matters, and how to use the list to judge any clinic, including ours.
Why one low testosterone reading is not enough
Testosterone is not a fixed number. It follows a daily rhythm, highest in the early morning and lower by afternoon, and it shifts from one day to the next. Poor sleep, a recent illness, alcohol, certain medications and even breakfast can pull a reading down.
The guideline authors point out that as many as 30% of men whose first result falls in the mildly low range test normal when the measurement is repeated (Bhasin et al., 2018). That is why a single low value is a reason to retest, not a reason to start a medication you may take for years.
| Factor | How it affects your result | What the guideline asks for |
|---|---|---|
| Time of day | Levels peak in the early morning | Draw blood in the morning |
| Food | Eating, especially sugar, can temporarily lower testosterone | Test fasting |
| Day-to-day variation | Values move between days | Repeat the test to confirm |
| Acute illness | Illness can suppress testosterone | Do not diagnose during an acute illness |
| Medications | Opioids and glucocorticoids can lower levels | Review what you take before testing |
What the Endocrine Society guideline actually says
The 2018 guideline, led by Dr. Shalender Bhasin and published in the Journal of Clinical Endocrinology and Metabolism (abstract on PubMed), recommends diagnosing hypogonadism only when both of these are true:
- You have symptoms and signs of testosterone deficiency. The more specific ones include reduced sex drive, fewer spontaneous erections, loss of body hair and shrinking testes. Fatigue, low mood and poor focus are common too, but they overlap with many other conditions. Our guide to the major symptoms of low testosterone walks through them.
- Your total testosterone is unequivocally and consistently low. That means fasting, morning samples, measured with an accurate and reliable assay, and confirmed with a repeat test.
The guideline does not set one universal cutoff for every lab. It asks clinicians to use the lower limit of a properly validated reference range, and it cites 264 ng/dL as the lower limit of the harmonized range for healthy, nonobese young men. A result near that line, without symptoms, is not a diagnosis.
When free testosterone matters. Most testosterone in your blood is bound to a protein called sex hormone binding globulin (SHBG). The guideline recommends measuring free testosterone when total testosterone is near the lower limit of normal or when SHBG is likely to be abnormal. Obesity and diabetes tend to lower SHBG; aging, liver disease, hyperthyroidism and HIV tend to raise it. Free testosterone should be measured by equilibrium dialysis or calculated from total testosterone, SHBG and albumin. For a deeper look, read our explainer on free vs total testosterone.
Follow-up labs that find the cause: LH, FSH, prolactin and iron
Confirming low testosterone answers "what." The next step answers "why." The guideline recommends measuring luteinizing hormone (LH) and follicle stimulating hormone (FSH), the pituitary signals that tell the testes to work.
| Pattern | Type | What it suggests | Typical next steps in the guideline |
|---|---|---|---|
| Low testosterone, high LH and FSH | Primary hypogonadism | The testes are not responding to the signal | Consider a karyotype for Klinefelter syndrome in selected men |
| Low testosterone, low or inappropriately normal LH and FSH | Secondary hypogonadism | The pituitary or hypothalamus is not sending enough signal | Prolactin, iron saturation, assessment of other pituitary hormones, and pituitary MRI in selected cases |
This step changes treatment. Secondary hypogonadism can come from obesity, opioid use, a prolactin-secreting pituitary tumor or iron overload (hemochromatosis). Some of those causes need their own treatment, and some are reversible. Men with secondary hypogonadism who want to protect fertility may also be candidates for medications that raise the body's own testosterone rather than replacing it, which is the idea behind BioCure's bioRestore tier.
Baseline safety labs before the first dose
Testosterone therapy affects more than testosterone. The guideline builds in safety checks before you start and on a schedule afterward.
| Test | Why it is checked | When the guideline places it |
|---|---|---|
| Hematocrit | Testosterone can raise red blood cell levels, which thickens blood | Baseline, at 3 to 6 months, then yearly; stop therapy if above 54% until it falls |
| PSA | Screens for prostate issues that testosterone could affect | Discuss screening with men 55 to 69, and men 40 to 69 at higher risk; recheck 3 to 12 months after starting |
| Bone density (DXA) | Long-standing low testosterone can thin bones | Men with very low testosterone or a fragility fracture |
| Lipids | Cardiovascular risk context | Not a guideline requirement, but a sensible baseline |
To be candid: lipids are not on the guideline's required list. They earn their place because heart health shapes many decisions in testosterone care, and having a baseline makes later changes easier to interpret.
On PSA, the guideline recommends urological evaluation before starting therapy if PSA is above 4 ng/mL, or above 3 ng/mL in men at increased risk, such as Black men and men with a first-degree relative who had prostate cancer.
Who should not start TRT, according to the guideline
The guideline recommends against starting testosterone in men with any of the following:
| Category | Condition |
|---|---|
| Fertility | Planning to father a child in the near term |
| Prostate and breast | Breast or prostate cancer; a palpable prostate nodule or induration; PSA above 4 ng/mL, or above 3 ng/mL in higher-risk men, without urological evaluation |
| Blood | Elevated hematocrit; thrombophilia (a tendency to form clots) |
| Sleep | Untreated severe obstructive sleep apnea |
| Urinary | Severe lower urinary tract symptoms |
| Heart and brain | Uncontrolled heart failure; heart attack or stroke within the last 6 months |
The fertility point surprises many men. External testosterone signals the pituitary to lower LH and FSH, which can sharply reduce sperm production. If children are in your near-term plans, say so at your first visit. Some items on this list, such as untreated sleep apnea, can be revisited once the underlying problem is managed.
How BioCure's Comprehensive Male Panel maps to the guideline
Longevity is not accidental, it is intentional, and so is a good diagnosis. At BioCure, testosterone care starts with labs, not a prescription. Our Comprehensive Male Panel covers hormones including testosterone, thyroid function, a lipid profile, and metabolic and organ markers. You can have blood drawn at home by an in-home phlebotomist or at a lab, with results in 7 to 14 days. A specialist then walks you through every result one on one.
| Guideline step | How it fits at BioCure |
|---|---|
| Symptoms and signs | Online intake (about 5 minutes) plus a physician video consultation |
| Morning, fasting total testosterone | Included in the panel; book the earliest draw slot and skip breakfast |
| Confirmatory repeat test | Discussed in your results review if your first value is low or borderline |
| Free testosterone, SHBG, LH, FSH, prolactin, hematocrit, PSA | Your physician confirms which markers your comprehensive Male panel covers and orders any others as needed |
| Thyroid, lipids, metabolic markers | Included; thyroid problems can mimic low testosterone symptoms and shift SHBG |
If testing supports treatment, your physician chooses among three tiers: bioOptimize (foundational), bioRestore (raising your own production without direct replacement) and bioTest (full replacement with ongoing hormone monitoring). The physician consultation is $199, which can be credited toward a membership. BioCure does not bill insurance directly, but many patients use HSA or FSA funds, and we provide documentation for reimbursement. See diagnostics and testosterone therapy for details.
How to use this list to judge any telehealth TRT clinic
Third-party rankings of telehealth clinics such as Hone Health, Henry Meds, Defy Medical and PeterMD tend to compare convenience and price. The guideline gives you a better yardstick. Before you sign up anywhere, ask:
- Do you require two morning, fasting total testosterone results before diagnosing?
- Will you measure free testosterone or SHBG if my total is borderline?
- Do you check LH and FSH to find the cause?
- Is hematocrit checked before I start and on a schedule afterward?
- How do you handle PSA for my age and risk?
- What happens if I want to keep my fertility?
A clinic that answers yes, clearly, is practicing medicine. One that skips these steps is selling a product.
Frequently asked questions
How many testosterone tests do I need before starting TRT?
The Endocrine Society recommends at least two total testosterone tests, drawn on separate mornings while fasting, both showing a consistently low level. Those results must line up with real symptoms. A single low reading is a reason to retest, not to start treatment.
Does a testosterone blood test have to be done in the morning?
Yes. Testosterone peaks in the early morning and falls later in the day, so an afternoon draw can look falsely low. The guideline also recommends fasting, because eating can temporarily lower testosterone.
What testosterone level is considered low by the Endocrine Society?
The guideline does not set one number for every lab; it uses the lower limit of a validated reference range. It cites 264 ng/dL as the lower limit of the harmonized range for healthy, nonobese young men. A low number counts only alongside symptoms and a confirmed repeat test.
Can I start testosterone therapy if I want to have kids?
The guideline recommends against starting testosterone in men planning fertility in the near term. External testosterone can sharply reduce sperm production. Tell your physician your plans, since options that raise your own production may fit better.
What labs should be monitored after starting testosterone?
The guideline calls for checking testosterone and hematocrit at 3 to 6 months, then yearly. PSA is rechecked 3 to 12 months after starting in men who are being screened. If hematocrit rises above 54%, therapy is paused until it comes down.
Can I get my testosterone tested at home?
Yes. BioCure offers an in-home phlebotomist visit or in-lab testing, with results in 7 to 14 days and a specialist review of every marker. Book an early-morning slot and stay fasting so your result meets the guideline standard.
Are you living by default or by design? The right testosterone decision starts with the right tests, done the right way, read by someone who explains them.
Let BioCure Health lead you in the right direction. Call or text us to schedule an introductory call at 754-206-0838. Your future self will thank you.