Low Testosterone: When to Test, and When to Actually Treat

Low T Is Real — and Frequently Mis-Managed

Low testosterone is a legitimate medical condition with meaningful effects on energy, sexual function, body composition, bone health, and mood. It is also, in 2026, one of the most over-diagnosed and over-treated conditions in men's health. Between aggressive direct-to-consumer clinics and well-meaning primary care offices writing testosterone for "fatigue," a lot of men end up on therapy they did not need — and sometimes miss a real underlying diagnosis in the process.

Let us walk through how to do it correctly: who should be tested, what the labs actually mean, when treatment is appropriate, and when it definitely is not.

Symptoms That Actually Warrant Testing

Fatigue alone is not a reason to check a testosterone level. Fatigue has too many causes — sleep apnea, thyroid disease, anemia, depression, deconditioning, medication side effects — to make testosterone a useful first test.

The symptoms that do warrant checking, per the Endocrine Society and the Urology Care Foundation, are the ones reflecting true androgen deficiency:

• Reduced libido or sexual desire
• Erectile dysfunction (though ED is more often vascular than hormonal)
• Unexplained loss of muscle mass or strength
• Decreased bone density, osteoporosis, or osteopenia in a man, or an unexpected fracture
• Hot flashes (uncommon, but specific)
• Loss of body hair, decreased shaving frequency
• Infertility
• Persistent depressed mood with other androgen-deficiency features

If several of these are present, testing makes sense. If it is just "I feel tired and I saw an ad," the first conversation should be about sleep, stress, alcohol, weight, and medications.

How to Test Correctly

This is where a lot of clinics go wrong. A proper workup looks like this:

1. Morning fasting total testosterone, drawn before 10 a.m. Testosterone has a pronounced diurnal rhythm — afternoon levels can be 20 to 30 percent lower and are not diagnostic.
2. Repeat an abnormal result on a separate morning before making a diagnosis. A single low value is not enough.
3. Measure free testosterone and SHBG in specific situations — obesity, diabetes, liver or thyroid disease, older age — where SHBG distortion can make total T misleading.
4. LH and FSH to distinguish primary (testicular) from secondary (pituitary/hypothalamic) hypogonadism.
5. Prolactin, especially if libido is prominently affected, to screen for a prolactinoma.
6. TSH, CBC, CMP, lipids, A1C, and PSA depending on age and risk.

Age-adjusted reference ranges remain a debated topic. Most labs use a single adult male range (roughly 300 to 1,000 ng/dL for total T), but clinically we weigh labs against symptoms. A man at 350 with classic symptoms and elevated LH is very different from an asymptomatic man at 280 whose SHBG is low from obesity.

Rule Out Reversible Causes First

Before diagnosing primary hypogonadism, we look for causes that, when corrected, restore testosterone without therapy:

• Obesity. Adipose tissue converts testosterone to estradiol and suppresses the HPG axis. Weight loss — particularly losing visceral fat — raises testosterone reliably.
• Obstructive sleep apnea. A huge driver of suppressed testosterone. Treating OSA often normalizes levels.
• Opioid use, including chronic prescription opioids, which suppress the hypothalamus
• Chronic heavy alcohol use
• Systemic illness, including uncontrolled diabetes
• Pituitary disease, including prolactinoma
• Certain medications, including long-term glucocorticoids and some psychiatric medications

If any of these apply, address them first. The NIDDK hypogonadism resource underscores the same point: treat the cause before reaching for the hormone.

Lifestyle Often Outperforms Supplementation

Men are frequently surprised how much of the "low T" experience responds to basics:

• Sleep. Seven to nine hours, consistent schedule, treatment of OSA
• Resistance training. Heavy compound lifts three times weekly raise testosterone meaningfully
• Weight loss of 5 to 10 percent if overweight
• Alcohol moderation
• Stress management and adequate recovery

Our men's health checklist covers these and other foundational pieces.

When Testosterone Replacement Therapy Is Appropriate

TRT is appropriate when a man has both confirmed laboratory hypogonadism (two low morning levels) and consistent clinical symptoms, reversible causes have been addressed, and he understands the tradeoffs.

Delivery Options

• Topical gels. Daily application, steady levels, risk of transference to partners or children if not handled carefully.
• Intramuscular or subcutaneous injections. Weekly or biweekly cypionate is most common. Stable for most men on weekly dosing.
• Pellets. Implanted every three to six months. Convenient but not easily dose-adjusted, and removal is a procedure.
• Nasal and oral preparations exist but are less commonly used.

Known Risks

• Erythrocytosis — elevated hematocrit, which raises stroke and clot risk. Monitor at three months, six months, then yearly.
• Fertility suppression. TRT shuts down natural sperm production. If fertility is desired, we do not use standard TRT — we use alternatives such as clomiphene or HCG.
• Acne, oily skin, sleep apnea worsening
• Prostate considerations. TRT does not cause prostate cancer, but it can stimulate an existing one. We check PSA at baseline and during therapy.
• Cardiovascular risk remains an evolving topic. Recent large trials have been reassuring in carefully selected men, but it is still a real part of the conversation.

Monitoring

Once on therapy, we recheck testosterone, hematocrit, PSA, and symptoms at three months, six months, and annually. Dose and delivery get adjusted based on what we find. If blood work is easier to get through our lab visits setup, we can streamline that.

When Not to Treat

TRT is not appropriate — or should be approached very cautiously — when:

• Fertility is actively desired
• Untreated prostate or breast cancer is present
• Hematocrit is already elevated
• Severe untreated sleep apnea is present
• Uncontrolled heart failure exists
• Symptoms do not match the numbers, or numbers do not confirm on repeat testing

The Honest Bottom Line

Real hypogonadism deserves real treatment — and the men who have it often feel like themselves again once we dial therapy in correctly. But getting there requires a careful diagnosis, attention to reversible causes, and honest monitoring over time. It is not a wellness subscription.

If you have symptoms that concern you, schedule a visit. We will run the right labs at the right time, rule out the things that commonly mimic low T, and — if treatment is genuinely indicated — build a plan that is safe, monitored, and tailored to your life.