Several types of doctors can diagnose and treat low testosterone, but the three most common are primary care physicians, endocrinologists, and urologists. Which one you start with, and where you end up, depends on how straightforward your case is, whether you’re trying to have children, and what’s actually causing your levels to drop.
Start With Your Primary Care Doctor
For most men, the first step is a primary care physician. They can order the initial blood work, evaluate your symptoms, and determine whether your testosterone is genuinely low or whether something else is going on. A diagnosis requires at least two separate fasting blood draws taken before 10 a.m. on different days, spaced at least four weeks apart. Testosterone levels fluctuate throughout the day and drop after eating, so morning fasting samples give the most accurate reading.
The American Urological Association defines low testosterone as a total level below 300 ng/dL, though different medical societies use thresholds ranging from 230 to 350 ng/dL. If your numbers come back low, your doctor will also check additional hormones to figure out whether the problem originates in the testes or in the brain’s signaling system. They’ll likely measure PSA (a prostate marker) and your hematocrit, which reflects red blood cell concentration. Both of these need to be within safe ranges before any treatment can begin.
Primary care doctors are well positioned to manage cases where low testosterone has a reversible cause, like obesity, poorly controlled diabetes, or certain medications. In those situations, addressing the underlying problem often improves testosterone without hormone therapy. If the cause is more complex or treatment requires specialist oversight, your primary care doctor will refer you.
When to See an Endocrinologist
Endocrinologists specialize in the hormone system. They’re particularly useful when low testosterone has an unclear cause, when it’s linked to other hormonal problems like thyroid disorders or insulin resistance, or when the issue traces back to the pituitary gland in the brain. If initial blood work shows that the signaling hormones from the brain are also low or abnormal, that points to a pituitary problem that may require imaging and a more detailed workup.
An endocrinologist will look beyond testosterone itself. As UChicago Medicine’s men’s health team puts it, treating low testosterone isn’t just about starting hormone therapy. It involves evaluating factors like blood sugar, weight, and metabolic health that can drive levels down. This broader perspective matters because simply prescribing testosterone to correct a lab number, without addressing the root cause, can mask a more serious condition or create unnecessary risks.
When to See a Urologist
Urologists handle the male reproductive system, so they’re the go-to specialists when low testosterone overlaps with fertility concerns, erectile dysfunction, or prostate health. A urologist can also manage testosterone therapy while monitoring for prostate-related side effects, which is especially relevant for men over 40.
If you’re planning to have children, this distinction becomes critical. Standard testosterone therapy actually shuts down sperm production. A urologist or reproductive specialist can prescribe alternative medications that raise testosterone while preserving fertility, including drugs that lower estrogen levels or mimic the brain hormones that stimulate the testes. These medications need to be dosed carefully because incorrect use can paradoxically lower sperm counts.
What About Low T Clinics?
Private “men’s health” or “Low T” clinics have grown rapidly in recent years, marketing directly to men with fatigue, low libido, and other nonspecific symptoms. Some provide legitimate care, but many operate on a model that prioritizes selling testosterone products over careful diagnosis. A physician writing in the Journal of General Internal Medicine described patients paying over $3,000 for basic prescriptions at such clinics, and another who was advised to start medication despite having a completely normal testosterone level above 450 ng/dL.
The core problem with these clinics is that they often skip the diagnostic process that distinguishes true hormone deficiency from symptoms caused by poor sleep, stress, weight gain, or depression. They may also downplay real risks of testosterone therapy, including infertility, elevated red blood cell counts, and breast tissue growth. If you’re considering one of these clinics, check whether the prescribing physician is board-certified in endocrinology, urology, or internal medicine. A reputable provider will insist on proper blood work, repeat testing, and a thorough evaluation before writing a prescription.
Insurance Requirements Shape Your Path
Insurance coverage for testosterone therapy typically requires documentation that mirrors good diagnostic practice: at least two low fasting testosterone levels drawn before 10 a.m. on separate days, ideally from the same lab. Medicare also requires a PSA test, a hematocrit check, and a digital prostate exam within the past 12 months before coverage kicks in. Some insurers, like Blue Cross Blue Shield of Arizona, go further and require that the prescribing doctor be a specialist in endocrinology or urology, or at least be consulting with one.
These requirements mean that even if your primary care doctor starts the process, you may need a specialist visit for your insurance to approve ongoing treatment. It’s worth calling your insurer before your first appointment to understand what they require.
Ongoing Monitoring Once Treatment Starts
Whoever prescribes your testosterone therapy will need to see you regularly afterward. The standard monitoring schedule involves a check at 3 to 6 months after starting treatment, then annually. At each visit, your doctor will measure your testosterone levels to confirm the therapy is working, check your hematocrit to watch for a dangerous rise in red blood cells, and assess whether your symptoms have actually improved.
If your hematocrit climbs above 54%, testosterone therapy needs to be paused until levels normalize. For men over 40, PSA testing and prostate exams are recommended at baseline, again at 3 to 12 months, and then yearly. Testosterone therapy is not a one-time prescription. It requires consistent follow-up regardless of which type of doctor manages it.
Who Should Not Receive Testosterone Therapy
Certain conditions rule out testosterone treatment entirely. Men with prostate or breast cancer cannot receive it. The same applies to men with a PSA above 4 ng/dL (or above 3 ng/dL for those at higher prostate cancer risk), a hematocrit above 48 to 50%, untreated severe sleep apnea, uncontrolled heart failure, or a heart attack or stroke within the past six months. Men with blood clotting disorders are also excluded. Your doctor should screen for all of these before starting treatment, which is another reason a thorough diagnostic workup matters more than a quick prescription.