Your testosterone labs came back ‘normal’ but you feel awful? Here’s what LH, FSH, SHBG, free T and prolactin actually tell us, and our approach in Sandy, UT
You came in because something was off. Maybe it’s fatigue that coffee stopped fixing. Brain fog like you’re thinking through wet cement. Muscle that’s harder to build and easier to lose. A drive that’s just… quieter than it used to be.
You got labs drawn. You waited. Someone told you everything looked “normal.”
But you don’t feel normal.
Here’s what most providers won’t tell you about low testosterone labs: a single lab result is a snapshot, and a snapshot of one morning can miss the entire movie. At Nervana Medical in Sandy, UT, we don’t just check labs once. We don’t treat off labs alone either. We look at your symptoms and your numbers together, and we trend them over time. This post walks through exactly what we check, why each marker matters, and how we interpret the pattern.
(This is the men’s edition. A women’s hormone lab post is coming next.)
“Normal” Isn’t the Same as Optimal
Before we walk through each lab, this is the single most important concept to understand.
Lab reference ranges are built from large populations that include sick people, sedentary people, people on multiple medications, and people who haven’t slept well in years. “Normal” means you’re not an outlier in that group. It does not mean you’re functioning at your best.
We’re not trying to get you to “normal.” We’re trying to find your optimal: the level at which you feel, perform, and recover the way you want to. That target is different for every patient, and it can only be found by watching your numbers and symptoms respond to treatment over time.
Total Testosterone: The Starting Point, Not the Whole Story
Total testosterone measures all the testosterone in your blood, including the portion bound to proteins your body can’t use. It’s where we start. It’s not where we stop.
Two men with identical total testosterone can feel completely different. One feels great. The other feels awful. The difference is almost always in what’s biologically available to their cells.
Why we trend it: Testosterone follows a diurnal rhythm: highest in the morning, dropping through the day. It also fluctuates with sleep, stress, alcohol, and illness. A single draw can catch you on an unusually good or bad day. Two draws, over time, give us a better baseline.
Free Testosterone: The Number That Actually Matters
Free testosterone is the portion not bound to proteins. It’s the biologically active fraction. What your brain, muscles, bones, and libido are actually using.
You can have a total testosterone that looks fine while your free testosterone is low. This happens when a protein called SHBG is elevated. It binds more testosterone and leaves less available for your body to use.
This is one of the most common reasons men walk out of an appointment with a “normal” lab result and still feel terrible. Total looked okay. Free was tanked. No one checked.
Why we trend it: Free testosterone is more sensitive to treatment than total. As we adjust a protocol, free T is often the first marker to move, and the best indicator that what we’re doing is working.
SHBG: The Hidden Variable
Sex Hormone Binding Globulin is a protein that binds testosterone (and other hormones) in the blood, making them unavailable for use. High SHBG = more testosterone bound = less free testosterone, even if total looks fine.
SHBG rises with age, certain thyroid conditions, and insulin sensitivity. It drops with insulin resistance, obesity, and high androgen states.
We check SHBG because it explains the gap between total and free testosterone, and because it often tells us we need to address something else entirely (insulin resistance, weight, thyroid) before adjusting a hormone dose.
Why we trend it: SHBG changes slowly. Lifestyle changes, weight loss, and metabolic improvements can lower it over months, meaning your free T can improve without ever touching a hormone prescription.
LH: Where Is the Problem?
Luteinizing Hormone is released by the pituitary and travels to the testes with one job: signal Leydig cells to make testosterone. Low testosterone paired with a clear LH reading tells us two completely different stories.
- LH high + testosterone low → primary hypogonadism. The pituitary is signaling loudly, the testes aren’t responding. The factory is broken. Treatment usually means testosterone replacement, because there’s no stronger signal that fixes a failing factory.
- LH low + testosterone low → secondary hypogonadism. The pituitary isn’t sending the signal. The factory works fine, it’s just not getting its orders. This is where Clomid or HCG can often restore your own production. Clomid alone typically produces ~50% increase, enough for some men, not enough for others to feel fully optimized, so we sometimes still pair with exogenous testosterone.
Why we trend it: If we’re treating with Clomid or HCG, LH is how we know it’s working. If you go on testosterone replacement, LH will drop. That’s expected. Watching it helps us understand your HPG axis response over time.
FSH: The Fertility Hormone
Follicle-Stimulating Hormone works alongside LH but targets a different part of the testes: the Sertoli cells, which produce sperm.
FSH follows the same high/low logic as LH:
- FSH high + testosterone low = testicular failure. Signal is there, factory isn’t responding. Fertility may be compromised or irreversible.
- FSH low + testosterone low = the signal isn’t being sent. Fertility is often recoverable with the right treatment.
This matters enormously for men who want to preserve fertility. Testosterone replacement suppresses both LH and FSH in almost all its forms, which stops sperm production. Before we start any man on testosterone, we check FSH and have a direct conversation about what it means for his plans.
Why we trend it: For men on Clomid or HCG, FSH recovery is a key sign that spermatogenesis is restarting. For men on TRT who later want children, FSH is one of the markers we monitor if we add HCG to the protocol. We typically don’t recommend testosterone therapy for men who want to maintain fertility unless HCG is part of the plan from day one.
Prolactin: The Most Commonly Missed Cause
Most people associate prolactin with breastfeeding. But elevated prolactin is one of the most underdiagnosed causes of low testosterone in men, and it’s one of the first things we rule out when total testosterone comes back low.
Prolactin suppresses the HPG axis. Elevated prolactin → reduced GnRH from the hypothalamus → less LH and FSH from the pituitary → less testosterone from the testes. The result looks exactly like secondary hypogonadism, but the cause is a prolactin problem, not a testosterone problem.
The most common culprit is a small, benign pituitary tumor called a prolactinoma. It’s treatable. But if we put someone on testosterone without checking prolactin first, we’re managing a symptom and ignoring a cause.
Why we trend it: Once prolactin is managed, LH and FSH often recover, and with them, endogenous testosterone. We don’t want to be stuck giving you a replacement hormone when the real fix is upstream.
Estradiol, Thyroid, and Metabolic Markers
A complete men’s hormone panel isn’t just the HPG axis. We also look at:
- Estradiol: because testosterone aromatizes to estrogen, and managing that balance affects how you feel
- TSH and free T3/T4: thyroid issues frequently mimic low T symptoms
- Fasting insulin and HbA1c: insulin resistance drives SHBG down and throws the whole system off
- Cortisol: chronic stress suppresses the HPG axis and worsens symptoms independently
Treating testosterone in a vacuum is how protocols fail. Treating the full picture is how patients actually feel better.
How We Work With Labs at Nervana Medical in Sandy, UT
Our approach to BHRT in Sandy, UT and men’s hormone therapy is not “one lab, one prescription.” It’s:
- Comprehensive initial panel: total and free testosterone, SHBG, LH, FSH, prolactin, estradiol, thyroid, fasting insulin, HbA1c, and cortisol
- Symptom mapping: how you feel, what’s changed, what you want back
- Treatment plan matched to the pattern (not a preset protocol)
- Re-check at 6–8 weeks, then quarterly, trending over time
- Adjustments based on both labs and symptoms
If your numbers look “optimal” but you still feel awful, we keep digging. If your numbers look “low” but you feel fine, we don’t overtreat. The labs inform. They don’t dictate.
Serving Sandy, Draper, South Jordan & the Salt Lake Valley
Nervana Medical is based in Sandy, Utah and sees men from Draper, Midvale, Cottonwood Heights, South Jordan, and the greater Salt Lake City area for hormone evaluation, TRT, and BHRT. We also offer telehealth for follow-up visits and lab reviews.
If you’ve been told your labs are “fine” but something’s still off, come in. Bring your labs. We’ll look at the pattern.
Book a men’s hormone panel consult in Sandy, UT →
Cassie Debenham, APRN, is a licensed provider at Nervana Medical in Sandy, Utah. She specializes in hormone therapy, BHRT, and lab-driven medical wellness. All clinical content is reviewed by our medical director.
Next in this series: Hormone Labs for Women. How estrogen, progesterone, testosterone, thyroid, and cortisol interact across cycles, perimenopause, and menopause. Subscribe to be notified when it publishes.
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