This article is sponsored by Yes Clinic.
Think your testosterone might be low? Before you look at TRT, enclomiphene or anything a forum swears by, you need real numbers. And a single blood test won’t give you them.
A proper low testosterone blood test is an early-morning draw for total testosterone, repeated on a second morning and read alongside your symptoms. One low result diagnoses nothing. In the Endocrine Society’s guideline, about 30% of men whose first result came back in the low range were normal on the repeat.
Let’s go through what the test actually measures, total vs free testosterone, why timing matters so much, the rest of the panel a clinician will want, and who won’t be started on testosterone at all. Whether treatment is on the table depends on your labs and a clinician, and no forum thread knows yours.
Key Takeaways💡
- One low result diagnoses nothing. About 30% of men with a low first result test normal on the repeat. 🔁
- Test early. MedlinePlus puts the draw window at 7 to 10 a.m., and two morning tests on separate days come before any diagnosis. ⏰
- The AUA calls a total testosterone under 300 ng/dL a reasonable cut-off, but symptoms have to be part of the picture too. 📊
- Near the line? Ask for free testosterone and SHBG, and tell the clinician about any SARMs or steroids you’ve used. 🧬
- Yes Clinic’s lab panels start at $129 in most states, priced separately from any medication. 💵
What Does a Low Testosterone Blood Test Measure?
Total testosterone, the standard first test, counts all the testosterone in your blood. Most of it is bound to proteins, mainly SHBG (sex hormone binding globulin) and albumin. A small unbound “free” share is what MedlinePlus describes as more available for your body to use. US labs report it in ng/dL. If yours says nmol/L, multiply by 28.84.
So what’s a normal testosterone level for a man? That depends on who’s drawing the line. For healthy, non-obese men aged 19 to 39, measured on CDC-certified assays, the Endocrine Society’s guideline gives a harmonized range of 264 to 916 ng/dL. The AUA guideline calls a total under 300 ng/dL a reasonable cut-off. Your own lab’s range, printed on the report, beats any number quoted online.
Even then, a low number is only half a diagnosis. Both guidelines want symptoms or signs alongside results that are, in the Endocrine Society’s phrase, “unequivocally and consistently low.”
Total vs Free Testosterone (and Where SHBG Comes In)
SHBG holds most of your testosterone. If yours runs high or low, your total moves with it while the free share may not. That means a total near the bottom of the range can mislead you in either direction.
That’s why the total vs free testosterone question matters most near the line. The Endocrine Society recommends adding free testosterone when your total sits near the lower limit or a condition changes SHBG. It should be measured by equilibrium dialysis or an accurate formula, never by the direct “analog” immunoassays the guideline calls inaccurate. Ask how your lab got the free number.
Here’s what moves SHBG, according to the Endocrine Society:
| Pushes SHBG down | Pushes SHBG up |
|---|---|
| Obesity, diabetes | Aging |
| Glucocorticoids, some progestins, androgenic steroids | HIV |
| Hypothyroidism | Hyperthyroidism |
| Nephrotic syndrome, acromegaly | Cirrhosis, hepatitis |
| SHBG gene variants | Some anticonvulsants, estrogens, gene variants |
Notice androgenic steroids sitting in the left column. They aren’t the only compounds that move these numbers.
What You've Already Taken Changes How Your Numbers Read
This is the part most SARM users need to hear. In a 2023 systematic review of SARM trials in healthy adults (Vignali and colleagues, Journal of Xenobiotics), the four studies that reported hormone levels found lower total testosterone and lower SHBG. Anabolic steroids have their own effect: per the Endocrine Society, stopping prolonged, high-dose use can markedly suppress your own production, and recovery can take months to years and may be incomplete.
The FDA’s position on SARMs is short: they “are not FDA approved.” Its consumer warning lists liver injury and acute liver failure, increased risk of heart attack or stroke, infertility, testicular shrinkage and sexual dysfunction among the reported problems.
So tell the clinician everything you’ve used, and when you last used it: SARMs, steroids, prohormones, anything labelled for research. Leave it out and your labs get read blind. You won’t find a recovery protocol here, and a prescription doesn’t cancel any of those risks.
If erections or libido are part of the picture, read our piece on SARMs and erectile dysfunction.
Why the Draw Happens Early (and Whether to Fast)
The best time to test testosterone is early morning, when levels peak. MedlinePlus puts the window at 7 to 10 a.m. In data the AUA guideline cites, afternoon values in men aged 30 to 40 ran 20 to 25% below their 8 a.m. values. Book your blood test for 4 p.m. and you can read low on a day you aren’t.
The guidelines split on fasting. The Endocrine Society includes it in its method, because glucose and food suppress testosterone; the AUA advises clinicians not to insist on it. An overnight fast keeps both happy.
Being sick skews it too. The Endocrine Society says not to test during or while recovering from an acute illness, or while on short-term opioids, and the AUA cites respiratory infections cutting testosterone by about 10% on average, and up to 30% in some men. A draw the week you had the flu mostly measures the flu.
Why One Low Testosterone Blood Test Isn't Enough
Both guidelines and the FDA label land on the same rule: test twice, in the morning. The AUA gives that a strong recommendation, and FDA-approved labeling for testosterone cypionate tells prescribers to confirm the diagnosis by “ensuring that serum testosterone concentrations have been measured in the morning on at least two separate days.”
Repeat results swing widely depending on the assay, the AUA reports, and two or three measurements cut that variability by 30 to 43%. Add the 30% of low first results that come back normal, and one draw is a thin basis for years of treatment. Your clinician picks the gap between tests (the AUA doesn’t set one) and decides on a third if the first is under 300 and the second is normal.
Book both draws like this:
- Before 10 a.m., after an overnight fast
- Not while you’re sick or still recovering
- Same lab and the same early window each time
- With a written list of every medicine and compound you’ve used, with dates
- With free testosterone, SHBG, LH and FSH on the order if your clinician agrees
The Rest of the Panel a Clinician Will Want
Once low testosterone is confirmed, the next tests look for a cause and check whether treatment can safely start.
| Test | Why it’s ordered | Who gets it |
|---|---|---|
| LH and FSH | Testicular (primary) vs pituitary or hypothalamic (secondary) cause | Confirmed low testosterone (Endocrine Society; AUA for LH) |
| Prolactin | Screens for a pituitary cause | Low testosterone with low or low-normal LH (AUA) |
| Estradiol | Checks estrogen | Breast symptoms or breast tissue growth (AUA) |
| Hemoglobin and hematocrit | Testosterone can raise red blood cell counts | Before testosterone, then periodically (AUA; FDA labeling) |
| PSA | Prostate check | Men over 40, before testosterone (AUA) |
LH helps a clinician see where the problem sits. A high LH means your brain is pushing and the testes aren’t answering. A low or low-normal LH points at the signal itself.
TRT, Enclomiphene or Lifestyle: How a Clinician Chooses
| TRT (testosterone) | Enclomiphene | Lifestyle changes | |
|---|---|---|---|
| What it is | Testosterone itself, such as cypionate injections | A SERM taken by mouth that changes how the brain reads the estrogen signal; one of the two isomers in clomiphene | Weight, blood sugar and medicine changes |
| Fertility | Suppresses sperm production (Endocrine Society) | Ask your clinician whether a route that doesn’t supply testosterone fits you | No drug effect |
| FDA status | Testosterone cypionate is FDA-approved; compounded versions are not | Not FDA-approved | Not a drug |
TRT has the narrowest door. The FDA says testosterone is “approved solely for use in men who lack or have low testosterone levels in conjunction with an associated medical condition” (FDA, Feb 2025), and the label says its safety and efficacy in “age-related hypogonadism” haven’t been established. It’s also a Schedule III controlled substance.
Enclomiphene vs TRT is your clinician’s call. Enclomiphene supplies no testosterone; it works through the HPTA, the loop from your brain to your testes. The AUA names men with low testosterone and low or low-normal LH as candidates for SERMs, a conditional recommendation on lower-grade evidence.
Of clomiphene, enclomiphene’s parent drug, the Endocrine Society says neither efficacy nor safety has been shown in randomized trials. Enclomiphene isn’t FDA-approved, and FDA does not review compounded drugs for safety, effectiveness or quality. The FDA still lists it as under evaluation for compounding, and its advisers voted against adding it in 2022.
Lifestyle sits under both routes, and the AUA tells clinicians to counsel every man with low testosterone on it. Obesity and diabetes are on the “lowers SHBG” list, and chronic opioid or corticosteroid use is on the AUA’s list of reasons to test, so bring your medicine list.
Who a Clinician Won't Treat With Testosterone
A clinician can say no. Expect a no, or a pause for more tests, if any of these fit you:
- Your numbers are normal, or one low result was never confirmed. Normal labs with symptoms aren’t a testosterone diagnosis under either guideline.
- You’re trying to conceive now (AUA), or planning to soon (Endocrine Society).
- You have breast cancer or known or suspected prostate cancer (FDA labeling), or a prostate nodule or a PSA above 4 ng/mL (3 at higher risk) without a urology workup (Endocrine Society).
- Your hematocrit is already high: the Endocrine Society counts a baseline above 48% (50% at altitude) against starting.
- You have untreated severe obstructive sleep apnea, severe urinary symptoms, uncontrolled heart failure, a clotting disorder, or a heart attack or stroke in the last six months (Endocrine Society).
- You’re 65 or older with low numbers and no symptoms. The Endocrine Society suggests against routine treatment there.
- You live in Connecticut, Pennsylvania, Arkansas, Minnesota, Louisiana, Alabama or Rhode Island, where Yes Clinic can’t offer TRT by telehealth as of October 2026.
And if what you’re really after is testosterone for performance, a prescription isn’t the route. FDA labeling says testosterone “has been subject to abuse, typically at doses higher than recommended for the approved indication,” and that anabolic steroid abuse can lead to serious heart and psychiatric reactions.
How Yes Clinic Fits
Yes Clinic is a LegitScript certified telehealth company. LegitScript is a private company that Yes Clinic pays for the review, so the certification isn’t a government or FDA approval. You can look up the certification yourself, and run these seven checks on Yes Clinic or any other online clinic.
- Get your numbers. A low testosterone blood test panel through Yes Clinic starts at $129 a draw in most states (New York and New Jersey cost more), so two draws cost twice that. It’s priced separately from any medication.
- See a licensed clinician live. TRT and enclomiphene both need one, plus labs. Federal telehealth rules for prescribing testosterone are temporary.
- The clinician decides. A prescription is written only if treatment is appropriate. If a clinician doesn’t prescribe, you aren’t charged for medication.
- A licensed US pharmacy prepares the order in your name. Dispensed medication can’t be returned or refunded.
The consultation is included. Yes Clinic prescribes only if a clinician decides it’s appropriate, and whether that could include enclomiphene or TRT depends on your labs and history. Outside California, Yes Clinic’s testosterone is compounded; California orders use a commercially manufactured product. Compounded medications, enclomiphene included, are not FDA-approved, and FDA does not review compounded drugs for safety, effectiveness or quality.
If you’re weighing a research-labelled product against a prescription, read who checks a research vial versus a prescription.
Where Yes Clinic falls short. Labs cost extra. Its $129 panel doesn’t include LH or FSH, so bring a result from any lab. Enclomiphene and compounded testosterone (outside California) aren’t FDA-approved, and the AUA prefers commercially manufactured testosterone to compounded when possible. A clinician may say no. There’s no phone line: you reach the care team through the patient portal or at support@yesclinic.com, which isn’t monitored around the clock, and health information shouldn’t go by email. In an emergency, call 911.
Conclusion
Low testosterone gets diagnosed with numbers, not vibes. That means two early-morning draws on separate days, read against your symptoms and your own lab’s range, with free testosterone and SHBG added if you’re near the line.
If you’ve used SARMs, steroids or prohormones, your results can read low for reasons that have nothing to do with how your body normally runs, so the clinician needs your full history before anyone talks treatment. Get the numbers first, then let a clinician decide between TRT, enclomiphene, lifestyle changes, or nothing at all.
FAQ's
Frequently Asked Questions
The Endocrine Society’s harmonized range for healthy, non-obese men aged 19 to 39 is 264 to 916 ng/dL, and the AUA treats a total below 300 ng/dL as a reasonable cut-off for low testosterone. Read any result against the range printed on your own lab report.
Early morning, between 7 and 10 a.m. according to MedlinePlus, when testosterone peaks. The Endocrine Society also asks for a fasting sample; the AUA doesn’t require one.
Total testosterone counts all the testosterone in the blood; free testosterone is the small unbound share, since most is bound to SHBG and albumin. The Endocrine Society recommends adding free testosterone when total testosterone is near the lower limit or SHBG is likely altered.
With two early-morning total testosterone tests on separate days, both low, plus symptoms or signs. The AUA and the Endocrine Society both require this, and FDA labeling for testosterone cypionate asks prescribers to confirm it the same way.
Not under the US guidelines, which diagnose testosterone deficiency only when consistently low testosterone meets symptoms or signs. FDA says testosterone is approved solely for men with low testosterone in conjunction with an associated medical condition.
They can. A 2023 systematic review of SARM trials in healthy adults found lower total testosterone and lower SHBG in the studies that reported hormone levels. SARMs are not FDA-approved, so tell the clinician what you’ve taken and when.
Important safety information. Prescription required; a licensed clinician decides whether treatment is appropriate. Testosterone is a Schedule III controlled substance: use it only as prescribed and store it securely. Do not use testosterone if you have breast cancer, known or suspected prostate cancer, or serious heart, liver or kidney disease; it is not for women who are pregnant. Testosterone can increase blood pressure, which can increase cardiovascular risk over time. Blood clots in the legs or lungs (DVT and PE) have been reported. Testosterone can raise red blood cell counts (polycythemia), which your clinician checks with bloodwork, and it can reduce sperm production and fertility. Abuse, usually at doses higher than prescribed, has been linked to serious heart and psychiatric reactions, and stopping high doses can cause withdrawal symptoms lasting weeks or months. Tell your clinician about heart, liver or kidney problems, high blood pressure, sleep apnea, urinary symptoms, or any prostate or breast condition. Enclomiphene and compounded testosterone are not FDA-approved. Tell your clinician right away about any change in vision. Clomiphene’s label calls for stopping and an eye exam. Full information: yesclinic.com/important-safety-information.
Yes Clinic is a LegitScript certified telehealth company. It is not a pharmacy and does not make or compound medication; a licensed US pharmacy prepares your prescription. Compounded medications are not FDA-approved, and FDA does not review them for safety, effectiveness or quality before marketing. A prescription is issued only if a licensed clinician decides treatment is appropriate; availability varies by state, and TRT is not available in Alabama, Arkansas, Connecticut, Louisiana, Minnesota, Pennsylvania or Rhode Island. The Endocrine Society, the American Urological Association, FDA, MedlinePlus and the authors of the review named in this article have no connection to Yes Clinic and do not endorse it.
DISCLAIMER: The information provided above is not intended to substitute professional medical advice, diagnosis, or treatment. Always seek your physician’s advice or another qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have seen or read.We bear no responsibility or liability for your use of any compound.
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