How Do You Get TRT? Diagnosis to Prescription

Getting testosterone replacement therapy starts with proving two things at once: your blood testosterone is genuinely low, and you have symptoms consistent with that deficiency. Neither piece alone is enough. Guidelines from every major urology and endocrinology society agree that TRT requires both a confirmed hormonal deficit and a clinical picture that matches it, not just a number on a lab report or a vague feeling of fatigue. The path from suspicion to prescription typically runs through a few weeks of bloodwork, a conversation about reversible causes, and a screening step to rule out conditions that make testosterone unsafe.

Recognizing Symptoms That Warrant Testing

Most men start this process because something feels off. The symptoms of low testosterone overlap with a lot of other conditions, which is partly why doctors insist on lab confirmation rather than treating based on symptoms alone. The classic signs include reduced sex drive, erectile difficulty, persistent fatigue, loss of muscle mass, increased body fat, depressed mood, and difficulty concentrating. Not every man with low testosterone has every symptom, and severity varies widely.

Erectile dysfunction is one of the more common reasons men end up getting their testosterone checked. Research has found that lower free testosterone levels track with absence of nocturnal erections and lower erectile function scores, though many other factors contribute to erectile problems too.¹ A low testosterone level alone doesn’t mean testosterone is the cause of your symptoms, and fixing the number doesn’t always fix the complaint. That nuance is exactly why the diagnostic process exists.

The Blood Test That Starts Everything

The first concrete step is a blood draw measuring total testosterone. Guidelines recommend this sample be taken in the early morning, ideally before 10 a.m., because testosterone levels follow a daily rhythm and peak during those hours.² A sample drawn at 3 p.m. could read lower than your actual baseline simply because of when it was collected, not because anything is wrong. If your first test comes back low, you’ll need at least one more morning draw on a separate day to confirm the result. A single low reading isn’t sufficient for diagnosis, since testosterone levels fluctuate day to day due to stress, sleep quality, illness, and other factors.

The threshold for “low” isn’t a single universally agreed-upon number, but major guidelines from organizations including the American Urological Association, the European Academy of Andrology, and the Endocrine Society generally place it in the range of 250 to 350 ng/dL.³ Below 250, most clinicians agree treatment is warranted if symptoms are present. Between 250 and 350, the decision often depends on symptom severity and how the individual patient is doing. Above 350, most doctors won’t prescribe TRT regardless of symptoms.

If total testosterone is borderline or if the clinical picture doesn’t quite match the number, your doctor may also check free testosterone and sex hormone-binding globulin (SHBG). Total testosterone includes the portion bound to proteins in your blood, while free testosterone is the fraction actually available for your body to use. Some men have normal total testosterone but low free testosterone, which can still produce symptoms.

Figuring Out Why Testosterone Is Low

Before jumping to a prescription, a responsible provider will want to understand what’s driving the deficiency. This matters because some causes are reversible and don’t need lifelong hormone therapy. The distinction your doctor is trying to make is between organic hypogonadism, where something is structurally wrong with the testes or the brain’s signaling system, and functional hypogonadism, where the hormonal axis is being suppressed by some other condition.⁴

Your workup will usually include luteinizing hormone (LH) and follicle-stimulating hormone (FSH) levels. These hormones, produced by the pituitary gland, tell the testes to make testosterone. Their levels help classify the type of hypogonadism. Low testosterone with low or normal LH suggests the problem is in the brain’s signaling (secondary hypogonadism). Low testosterone with elevated LH means the testes are failing despite appropriate signals (primary hypogonadism).⁵ This classification guides both treatment choices and how aggressively your doctor investigates underlying causes.

Additional labs typically include a complete blood count, a metabolic panel, prolactin, and thyroid function. In some cases, particularly in younger men or those with very low levels, an MRI of the pituitary gland is ordered to rule out a tumor. Prolactin-secreting pituitary tumors are one treatable cause of secondary hypogonadism that should be caught before starting TRT.

Reversible Causes Your Doctor Should Rule Out First

Obesity is one of the most common and most fixable reasons men end up with low testosterone. Excess body fat suppresses the hormonal axis, and the resulting low testosterone is considered functional because it can reverse with significant weight loss.⁶ Multiple studies have confirmed that losing substantial weight, whether through diet, exercise, or bariatric surgery, can raise testosterone levels back into the normal range without any hormonal treatment.⁷

Other potentially reversible contributors include opioid use, which strongly suppresses testosterone production, certain medications like glucocorticoids, untreated sleep apnea, and excessive alcohol consumption. A good clinician will push you to address these before handing over a testosterone prescription. That said, it’s not always practical to delay treatment indefinitely. A man who is severely symptomatic and obese might reasonably start TRT while also working on weight loss, with the understanding that the need for TRT should be reassessed later.

Age alone, it’s worth noting, does not inevitably cause hypogonadism. While testosterone does decline gradually over the decades, research shows that aging by itself is not what precipitates true hormonal deficiency. It’s the health conditions that accumulate with age, like obesity, metabolic syndrome, and type 2 diabetes, that tend to drive testosterone levels down.⁸

Pre-Treatment Screening and Contraindications

Once your doctor has confirmed low testosterone on at least two morning blood draws, identified symptoms, and either addressed or accounted for reversible causes, the next step is screening for conditions that make TRT unsafe. Testosterone is contraindicated in men with untreated prostate cancer or breast cancer.⁹ This is why a baseline PSA (prostate-specific antigen) level and, sometimes, a digital rectal exam are part of the standard workup before prescribing.

Other red flags include untreated severe sleep apnea, an already elevated red blood cell count (hematocrit above roughly 50%), and a desire to father children in the near future. That last one is a critical conversation that gets overlooked more often than it should.

Why Fertility Is a Deal-Breaker for Some Men

Exogenous testosterone suppresses the brain’s signaling hormones, LH and FSH, which are the same hormones that drive sperm production.¹⁰ In practical terms, starting TRT can dramatically reduce your sperm count, sometimes to zero. For younger men or anyone planning to have children, this is not a minor side effect; it’s a major consideration that should be discussed before the first dose.

The good news is that alternatives exist. Human chorionic gonadotropin (hCG) mimics LH and can stimulate the testes to produce testosterone naturally while preserving sperm production.¹¹ Some providers prescribe hCG alongside TRT, while others use it as standalone therapy for men whose primary concern is fertility. Clomiphene citrate, an oral medication typically associated with female fertility treatment, is another off-label option. It blocks estrogen receptors in the brain, tricking the pituitary into producing more LH and FSH, which in turn stimulates the testes to make more testosterone on their own while keeping sperm production intact.¹² These alternatives are especially relevant for men in their 20s and 30s who are being diagnosed with hypogonadism in rising numbers.

Choosing a Formulation

Assuming you’re cleared for TRT, you and your provider will choose from several delivery methods. Each has tradeoffs in terms of convenience, cost, consistency of testosterone levels, and side effect profile.

Injections: Testosterone cypionate and testosterone enanthate are the most commonly prescribed forms. They’re given intramuscularly or subcutaneously, typically every one to two weeks. Injections are inexpensive, especially with insurance, and reliably raise testosterone levels, but they produce peaks and valleys between doses. Some men notice mood or energy swings in sync with that cycle.
Topical gels: Applied daily to the shoulders, upper arms, or abdomen. Gels provide steadier testosterone levels throughout the day but carry a risk of transferring the hormone to partners or children through skin contact. They’re more expensive than injections, especially without insurance.
Patches: Worn daily, usually on the back, abdomen, or thigh. They deliver consistent levels but can cause skin irritation at the application site, and many men find them inconvenient.
Oral formulations: The FDA has approved oral testosterone undecanoate products. These newer formulations use a specialized delivery system that gets absorbed through the lymphatic system rather than passing through the liver, which was the historic problem with oral testosterone.¹³ They need to be taken with food, preferably a meal containing fat, for adequate absorption.¹⁴
Pellets: Subcutaneous pellets implanted in the hip or buttock every three to six months. They offer hands-off convenience but require a minor in-office procedure for each insertion and carry a small risk of pellet extrusion.
Nasal gel: Applied inside the nose two to three times daily. It avoids the skin-transfer risk of topical gels but the frequent dosing schedule makes adherence challenging for some men.

The choice often comes down to lifestyle and budget. Injections dominate in terms of raw cost-effectiveness, while gels and oral formulations win on convenience for men who don’t want to handle needles.

Traditional Clinics Versus Telemedicine

A growing number of men now access TRT through direct-to-consumer telemedicine platforms. These services have made the process faster and more accessible, especially for men in areas without a nearby endocrinologist or urologist. Research comparing these platforms to traditional care found that their initial evaluations and follow-up protocols were broadly similar to standard guidelines.¹⁵

The catch is cost. A year of injectable testosterone through telemedicine platforms ranged from roughly $1,600 to $4,200, compared to about $130 to $1,330 at a traditional academic center depending on insurance coverage.¹⁵ Transdermal testosterone showed a similar markup on telemedicine platforms. If you have decent insurance, a traditional endocrinology or urology practice will almost always be cheaper in the long run. Telemedicine platforms tend to appeal to men paying cash, those who value speed and convenience, or those who’ve struggled to get a diagnosis through conventional channels.

One thing to watch for with any telemedicine testosterone clinic is how thoroughly they evaluate reversible causes. The best providers, whether online or in-person, will insist on understanding why your testosterone is low before treating it. A clinic that draws one testosterone level and ships you a vial the same week may be cutting corners in a way that costs you down the road.

What Happens After You Start

Getting the prescription is not the end of the process. Proper TRT requires ongoing monitoring. You should expect bloodwork within the first few months to confirm that your testosterone level has reached the therapeutic range and that you’re not developing side effects. The AUA emphasizes that follow-up should verify that therapeutic testosterone levels are reached and that symptoms are actually improving, not just that the number on the lab report looks better.¹⁶

The main things your doctor will track include hematocrit (red blood cell concentration), PSA, and liver function. TRT can stimulate red blood cell production, and if hematocrit climbs too high, it thickens the blood and raises the risk of clotting events.⁹ PSA is monitored because, while TRT doesn’t appear to cause prostate cancer, it would be irresponsible to miss a developing cancer in a man receiving testosterone. Most guidelines suggest checking these labs at three to six months after starting, then annually.

The Cardiovascular Question

For years, the biggest cloud hanging over TRT was whether it increased the risk of heart attacks and strokes. Observational data in the early 2010s triggered FDA safety warnings, and the uncertainty around this question was real. Meta-analyses of smaller trials produced conflicting results.¹⁷

The landscape shifted substantially with the TRAVERSE trial, the first large randomized study specifically designed to answer this question. It enrolled men aged 45 to 80 who had pre-existing cardiovascular disease or multiple risk factors. The primary cardiovascular endpoint, a composite of heart attack, stroke, and cardiovascular death, occurred at essentially the same rate in men receiving testosterone as in those receiving placebo. The trial found no increase in major cardiovascular events or prostate-related events, effectively addressing the FDA’s earlier concerns.¹⁸ The hazard ratio for the primary composite endpoint was 0.96, meaning no meaningful difference between groups.¹⁹

That said, the trial did observe a higher incidence of atrial fibrillation, acute kidney injury, and pulmonary embolism in the testosterone group.¹⁹ These secondary findings don’t mean TRT is risk-free, but the overall message is reassuring compared to the alarm of a decade ago: for men with a genuine indication, major cardiovascular events don’t appear to increase.

Mood, Energy, and What TRT Can Realistically Do

Many men pursue TRT hoping it will fix fatigue, brain fog, or low mood. The evidence here is genuinely encouraging for men with confirmed hypogonadism. A systematic review of clinical trials found that testosterone therapy produced meaningful improvements in mood, motivation, sexual function, and certain cognitive domains, particularly verbal memory and visuospatial performance, in men with biochemically confirmed low testosterone.²⁰ There’s even evidence that testosterone can serve as a useful addition to antidepressant therapy in men with treatment-resistant depression and documented hypogonadism.

The important qualifier is “biochemically confirmed.” Men with normal testosterone who take supplemental testosterone hoping for a cognitive or mood boost are unlikely to see the same benefits and are exposing themselves to side effects without a legitimate indication. The psychological improvements tracked in trials were specifically in men whose brains were running on insufficient androgen levels. TRT restores what’s missing; it doesn’t enhance beyond normal.

When TRT Leads to Legal Trouble for Providers

An interesting angle most patients never think about is the medicolegal landscape around testosterone prescribing. A review of lawsuits against providers from 2000 to 2024 found that the single most common basis for legal claims was not harm from testosterone itself but rather the withholding of treatment from men who arguably needed it. Out of 25 cases involving testosterone therapy, 10 involved allegations that the provider should have prescribed TRT but didn’t. Prostate cancer, cardiac events, death, and psychiatric effects made up the remaining claims.²¹ Internal medicine providers were the most frequently named specialty. This data reflects how the tension around testosterone prescribing runs in both directions: some doctors over-prescribe, others under-diagnose, and both patterns generate real harm.

For you as a patient, this is a practical reminder that getting TRT is partly about finding the right provider. An endocrinologist, urologist, or men’s health specialist who prescribes TRT regularly will be more comfortable with the diagnostic workup, monitoring schedule, and dosing adjustments than a generalist who rarely deals with hormonal therapy. If your primary care physician seems dismissive or unfamiliar with the guidelines, seeking a specialist referral is reasonable.

1
PubMed. Testosterone levels in men with erectile dysfunction
2
PubMed Central. PURLS: It’s time to reconsider early-morning testosterone tests
3
PubMed Central. The Optimal Indication for Testosterone Replacement Therapy in Late Onset Hypogonadism
4
The Journal of Clinical Endocrinology & Metabolism. Approach to the Patient: The Evaluation and Management of Men ≥50 Years With Low Serum Testosterone Concentration
5
The Journal of Clinical Endocrinology & Metabolism. Characteristics of Secondary, Primary, and Compensated Hypogonadism in Aging Men: Evidence from the European Male Ageing Study
6
PubMed Central. Male Obesity-related Secondary Hypogonadism – Pathophysiology, Clinical Implications and Management
7
PubMed Central. The Role of Diet and Weight Loss in Improving Secondary Hypogonadism in Men with Obesity with or without Type 2 Diabetes Mellitus
8
PubMed. Functional testosterone deficiency in aging men: Clinical impact, diagnostic pathways, and treatment strategies
9
PubMed Central. Risks of testosterone replacement therapy in men
10
PubMed Central. Testosterone Is a Contraceptive and Should Not Be Used in Men Who Desire Fertility
11
PubMed Central. Indications for the use of human chorionic gonadotropic hormone for the management of infertility in hypogonadal men
12
PubMed Central. Clomiphene citrate: A potential alternative for testosterone therapy in hypogonadal males
13
PubMed Central. Testosterone Replacement Therapy: A Narrative Review with a Focus on New Oral Formulations
14
PubMed Central. Is Oral Testosterone the New Frontier of Testosterone Replacement Therapy?
15
The Journal of Sexual Medicine. Practice Comparison and Cost Analysis of Direct-to-Consumer Telemedicine Platforms Offering Testosterone Therapy
16
PubMed. Evaluation and Management of Testosterone Deficiency: AUA Guideline
17
PubMed Central. The Effect of Testosterone on Cardiovascular Disease and Cardiovascular Risk Factors in Men: A Review of Clinical and Preclinical Data
18
PubMed Central. Long Term Cardiovascular Safety of Testosterone Therapy: A Review of the TRAVERSE Study
19
PubMed. Cardiovascular Safety of Testosterone-Replacement Therapy
20
PubMed Central. Psychiatric and Cognitive Effects of Testosterone Therapy in Adult Men: A Systematic Review of Clinical Evidence and Mechanistic Insights
21
Oxford Academic. Testosterone therapy and lawsuits against prescribers: a legal case review from 2000 to 2024