How to Get TRT: Step-by-Step Guide to Testosterone Therapy

Step 1: Recognize the Symptoms of Low Testosterone

The process starts with you, not a lab. Low testosterone (hypogonadism) produces a pattern of symptoms that overlap with depression, sleep disorders, and normal aging. Recognizing the pattern is what moves you from "I feel off" to "I should get tested."

Classic Symptom Cluster

The Endocrine Society's 2018 clinical practice guideline defines symptomatic hypogonadism as the combination of low serum testosterone and specific signs: reduced sexual desire, erectile dysfunction, decreased spontaneous erections, breast discomfort or gynecomastia, loss of body hair, and reduced shaving frequency [1]. Fatigue and diminished energy are reported by roughly 40% of men with total testosterone below 300 ng/dL [2].

Less Obvious Signs

Mood changes get missed often. A cross-sectional analysis from the European Male Ageing Study (EMAS, N=3,369) found that only three sexual symptoms (poor morning erection, low sexual desire, and erectile dysfunction) were consistently associated with low testosterone [2]. Non-sexual symptoms like difficulty concentrating, irritability, and reduced motivation showed weaker but real correlations once total T dropped below 320 ng/dL.

One practical screen: if you have two or more sexual symptoms plus fatigue or mood changes that have persisted for more than three months, testing is warranted.

Step 2: Get the Right Blood Work

A single blood draw does not confirm hypogonadism. Guidelines from both the American Urological Association (AUA) and the Endocrine Society require at least two morning samples showing total testosterone below 300 ng/dL [1][3].

Why Morning Draws Matter

Testosterone follows a circadian rhythm, peaking between 7:00 and 10:00 a.m. A study published in the Journal of Clinical Endocrinology & Metabolism showed that afternoon testosterone values can be 20 to 25% lower than morning values in men under 45 [4]. Drawing blood after noon inflates the false-positive rate.

The Complete Initial Panel

A responsible clinician orders more than just total testosterone. The minimum panel should include:

| Test | Why It Matters | |---|---| | Total testosterone (x2 mornings) | Confirms diagnosis threshold | | Free testosterone | Identifies cases where SHBG elevation masks true deficiency | | LH and FSH | Distinguishes primary (testicular) from secondary (pituitary) hypogonadism | | Prolactin | Screens for pituitary adenoma if LH/FSH are low | | CBC with hematocrit | Establishes baseline before TRT raises red cell mass | | PSA | Prostate safety baseline | | Comprehensive metabolic panel | Liver and kidney function | | Estradiol (sensitive assay) | Baseline for aromatase activity monitoring |

The AUA guideline explicitly states: "Clinicians should obtain a total testosterone level as the initial diagnostic test. If the total testosterone is low or borderline, a confirmatory test should include a total testosterone and free testosterone" [3].

What About At-Home Test Kits?

Finger-prick testosterone kits have grown popular. They can signal a trend, but most endocrinologists will not prescribe based on a capillary sample alone. Venous draws remain the standard for treatment decisions.

Step 3: Get a Formal Diagnosis

Two confirmed low readings plus symptoms equal a diagnosis. The distinction between primary and secondary hypogonadism matters because it shapes the treatment plan.

Primary vs. Secondary Hypogonadism

Primary hypogonadism means the testes themselves produce insufficient testosterone. LH and FSH are elevated because the pituitary is signaling hard but the testes cannot respond. Causes include Klinefelter syndrome, prior testicular injury, chemotherapy, and age-related Leydig cell decline.

Secondary (central) hypogonadism means the hypothalamus or pituitary fails to send adequate signals. LH and FSH are low or inappropriately normal. Causes include pituitary tumors, obesity, opioid use, and anabolic steroid abuse. The Endocrine Society guideline recommends MRI of the sella turcica when secondary hypogonadism is confirmed and prolactin is elevated [1].

Borderline Cases

Total testosterone between 264 and 300 ng/dL sits in a gray zone. Free testosterone calculation becomes decisive here. A man with total T of 290 ng/dL but SHBG of 55 nmol/L may have a calculated free testosterone well below the 5th percentile reference range reported in the Framingham Heart Study cohort (approximately 70 pg/mL for men aged 40 to 49) [5].

Step 4: Choose Your Prescribing Clinician

You have several paths to a prescription. Each carries different trade-offs in cost, speed, and depth of monitoring.

Urologist or Endocrinologist

Specialists offer the deepest diagnostic workup. They are the best fit when your labs suggest secondary hypogonadism, you have a history of prostate concerns, or you want fertility preservation strategies alongside TRT. Wait times for new-patient appointments average 3 to 6 weeks in most metro areas.

Primary Care Physician

Many internists and family medicine doctors prescribe TRT comfortably. If your PCP ordered the initial labs and your case is straightforward primary hypogonadism, staying within your existing care relationship avoids fragmentation.

Telehealth TRT Clinics

Licensed telehealth platforms prescribe testosterone in most states after reviewing uploaded labs and conducting a video consultation. Turnaround from lab upload to prescription can be as short as 48 hours. The trade-off: you need to be proactive about requesting the full monitoring panel at follow-up, since visit times tend to be shorter.

Regardless of the path, the prescribing clinician should document the diagnosis with ICD-10 code E29.1 (testicular hypofunction) to support insurance claims and pharmacy processing.

Step 5: Select a Testosterone Formulation

The formulation you choose affects injection frequency, absorption consistency, cost, and side-effect profile. The AUA guideline does not endorse one formulation over another but recommends individualized selection [3].

Injectable Testosterone (Cypionate and Enanthate)

Testosterone cypionate 100 to 200 mg intramuscularly every 1 to 2 weeks is the most common U.S. Protocol. It is inexpensive ($30 to $90/month for generic) and produces reliable serum levels. The downside is peak-trough fluctuation, which some men experience as mood swings or energy dips before the next injection. Subcutaneous injection of smaller doses (e.g., 50 to 80 mg twice weekly) has gained popularity for flattening peaks and troughs. A 2017 study in Translational Andrology and Urology found subcutaneous delivery produced comparable serum levels to intramuscular injection with less injection-site pain [6].

Topical Gels and Solutions

Testosterone 1% gel (e.g., AndroGel, Testim) is applied daily to the shoulders or upper arms. Steady-state levels are reached within 24 to 48 hours. The primary risk is transference to partners or children through skin contact. The FDA requires a black-box warning on all testosterone gel products for secondary exposure [7]. Monthly cost ranges from $50 (generic) to $500+ (brand).

Nasal Gel, Pellets, and Oral Options

Natesto (nasal testosterone) delivers 11 mg three times daily. Subcutaneous pellets (Testopel) are implanted every 3 to 6 months. Oral testosterone undecanoate (Jatenzo) was FDA-approved in 2019 and taken twice daily with food. Each has a niche: pellets suit men who want minimal daily intervention, nasal gel may preserve spermatogenesis better than injections, and oral options avoid needles entirely.

Step 6: Fill the Prescription and Start Treatment

Once your clinician writes the prescription, filling it requires a few practical steps that trip up first-timers.

Pharmacy Logistics

Testosterone is a Schedule III controlled substance under the DEA. Prescriptions cannot have more than five refills and expire after six months. Many retail pharmacies stock testosterone cypionate, but supply disruptions happen. Specialty or compounding pharmacies can be useful backups if your local pharmacy is out of stock.

Self-Injection Training

If you choose injectables, your prescribing clinic should provide a demonstration. Standard intramuscular injection sites are the vastus lateralis (outer thigh) and the ventrogluteal (hip). Subcutaneous injections use a shorter needle (27 to 30 gauge, 0.5 inch) into abdominal or thigh fat. A meta-analysis in Sexual Medicine Reviews confirmed that patient-administered subcutaneous testosterone injections are safe and effective, with high adherence rates exceeding 90% at 12 months [8].

What to Expect in the First Weeks

Libido improvements often appear within 3 to 6 weeks. Energy and mood changes can take 6 to 12 weeks. Body composition shifts (increased lean mass, decreased fat mass) require 12 to 16 weeks minimum. The Testosterone Trials (TTrials, N=790), a coordinated set of seven placebo-controlled trials funded by the NIH, found that testosterone gel significantly improved sexual desire and erectile function by week 12, but physical function improvements were modest [9].

As the Endocrine Society guideline states: "Patients should be informed that the full effect of testosterone treatment on different outcomes occurs at different time intervals" [1].

Step 7: Monitor, Adjust, and Maintain

TRT is not a one-time prescription. It is an ongoing treatment that requires regular blood work and dose adjustments.

First Follow-Up (6 to 12 Weeks)

Your clinician should draw labs midway between injections (for injectable users) to capture a trough level. Target trough total testosterone is 400 to 700 ng/dL per the AUA guideline [3]. Key labs at this visit include total testosterone, hematocrit, PSA, and estradiol.

Hematocrit: The Red Flag to Watch

TRT stimulates erythropoiesis. Hematocrit above 54% increases the risk of thromboembolic events. A retrospective cohort study of 38,000 men on TRT published in JAMA Internal Medicine found that injectable testosterone was associated with a higher rate of polycythemia compared to gels (odds ratio 3.2, 95% CI 1.8 to 5.7) [10]. If hematocrit climbs above 50%, your clinician may lower the dose, switch formulations, or recommend therapeutic phlebotomy.

Ongoing Monitoring Schedule

| Timepoint | Labs | |---|---| | 6 to 12 weeks | Total T, hematocrit, PSA, estradiol | | 6 months | Total T, free T, CBC, CMP, PSA, estradiol | | Annually thereafter | Full panel plus lipids and DXA bone density (if indicated) |

Dose Adjustments

If trough total testosterone is below 400 ng/dL and symptoms persist, a dose increase of 20 to 40 mg per injection is typical. If estradiol rises above 40 to 50 pg/mL and the patient develops nipple sensitivity or water retention, the clinician may reduce the dose or adjust injection frequency before considering an aromatase inhibitor.

Step 8: Address Fertility Before You Start

This step should actually happen before step 6, but many men learn about it too late. Exogenous testosterone suppresses the hypothalamic-pituitary-gonadal axis, which reduces or eliminates sperm production.

The Fertility Risk Is Real

A survey of 365 men on TRT published in Fertility and Sterility found that 88% were not informed about the contraceptive effect of testosterone therapy by their prescribing physician [11]. Recovery of spermatogenesis after stopping TRT takes 6 to 12 months on average, and some men do not fully recover.

Preservation Options

For men who want to keep fertility options open, clinicians may prescribe human chorionic gonadotropin (hCG) alongside testosterone at 500 to 1,000 IU two to three times weekly. Alternatively, clomiphene citrate (off-label) or enclomiphene can raise endogenous testosterone without suppressing spermatogenesis. The AUA guideline recommends against testosterone monotherapy in men desiring fertility and suggests semen cryopreservation before initiating treatment [3].

What TRT Will Not Fix

Testosterone therapy treats hypogonadism. It does not fix sleep apnea, insulin resistance, or relationship problems, even though all of these can contribute to the symptoms that drove you to get tested. Obstructive sleep apnea in particular should be treated before or alongside TRT, as the Endocrine Society notes that "testosterone therapy without treating OSA may worsen the condition" [1].

If your BMI is above 30, losing 5 to 10% of body weight through caloric deficit and resistance training can raise total testosterone by 50 to 100 ng/dL independently, according to data from the EMAS cohort [2]. Weight loss is not a substitute for TRT in confirmed hypogonadism, but it amplifies the response.