Your Labs Came Back Normal. You Still Feel Off.
Tired by 2 p.m. Drive gone. Workouts that stopped paying off. You asked for labs, the number came back "normal," and that was the end of the conversation. But a normal total testosterone does not mean your body is getting enough of it. Here is why, and what to ask for.
Total testosterone is not the whole story
The standard lab test measures total testosterone. That number counts every molecule of testosterone in your blood. Most of it is not available to your body.
Bound tightly to sex hormone binding globulin. Your tissues cannot use this portion.
Bound weakly, so some of it can break free when tissues need it.
Unbound and active. This is the part that reaches muscle, brain and sex organs.
So two men can have the same total testosterone and live in completely different bodies. One has plenty of free hormone. The other has most of his locked away.
SHBG is the swing factor
When SHBG runs high, it grabs more testosterone and leaves less free. Your total can look fine while your free level sits at the bottom of the range or below it. When SHBG runs low, the opposite happens, and a total that looks borderline may be adequate.
- Getting older
- An overactive thyroid
- Liver disease or heavy alcohol use
- Some seizure medications
- Very low body fat or under-eating
Higher SHBG means less free testosterone.
- Extra weight, especially around the middle
- Insulin resistance and type 2 diabetes
- An underactive thyroid
- Some steroid medications
Lower SHBG can make a low total look worse than it is.
A common example
A 52-year-old man has a total testosterone of 420 ng/dL. Well inside the lab's range. But his SHBG is high, and when free testosterone is calculated, it lands below the reference range. His symptoms match the free number, not the total. He was told he was fine. He was not.
What "normal" means on your report
Reference ranges are wide. The harmonized range used by many labs runs roughly 264 to 916 ng/dL, based on healthy men aged 19 to 39. The American Urological Association uses 300 ng/dL as its cutoff for low testosterone. A man sitting at 310 is technically normal. And he may feel nothing like the man at 800.
Normal is a range. Not a diagnosis. Your symptoms, your free level and your SHBG together tell us far more than one number with a green check next to it.
Getting a lab draw you can trust
- Test in the morning. Testosterone peaks early. Draw between 7 and 10 a.m.
- Come in fasting. Eating, especially sugar, can push testosterone down for a few hours.
- Skip testing while sick. Illness, a bad night of sleep, or a hard training week can all lower a single result.
- Repeat a low or borderline result. National guidelines call for two morning tests before anyone diagnoses low testosterone.
- Ask for SHBG and free testosterone. Free testosterone should be calculated from total testosterone, SHBG and albumin, or measured by equilibrium dialysis. The quick "direct" free testosterone test some labs run is not reliable.
The panel we look at
| Test | Why it matters |
|---|---|
| Total testosterone | The starting point. Not the finish line. |
| SHBG | Tells us how much of your total is locked up. |
| Free testosterone | The active portion. Often the number that matches how you feel. |
| LH and FSH | Shows whether the problem starts in the testes or in the brain's signal to them. This changes which treatments make sense. |
| Estradiol | Men need some estrogen. Too much or too little both cause symptoms. |
| Prolactin | A high level can shut testosterone production down and needs its own workup. |
| CBC, metabolic panel, lipids | Baseline safety labs, including red blood cell count. |
| Thyroid, A1c, vitamin D, iron studies | These problems look a lot like low testosterone and are common alongside it. |
| PSA | Prostate screening when it fits your age and history. |
It might not be testosterone
Fatigue, low drive and poor focus have more than one cause. Untreated sleep apnea, a slow thyroid, low iron, depression, alcohol, opioid pain medications and chronic stress all produce the same picture. Sometimes they are the reason testosterone dropped in the first place. A good workup looks for all of them, so you are not put on a medication that treats the wrong problem.
If your free testosterone is low
There is more than one way to treat it. Testosterone therapy replaces the hormone directly. But it also tells your body to stop making its own, which shuts down sperm production. If you want children now or later, that matters, and fertility-sparing options like enclomiphene work by getting your body to make more of its own testosterone instead.
Whatever the plan, it should be adjusted to how you respond. Rechecking labs and changing the plan when you are still symptomatic is part of the job, not an extra.
- Testosterone is a Schedule III controlled substance. In Texas it requires an in-person evaluation, and we prescribe it to Texas patients only.
- Not for anyone under 18.
- Never take testosterone from a gym, a friend or an online seller. Unregulated products carry real risks, including blood clots, high red blood cell counts and permanent fertility loss.
- Bhasin S, Brito JP, Cunningham GR, et al. Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2018;103(5):1715-1744.
- Mulhall JP, Trost LW, Brannigan RE, et al. Evaluation and Management of Testosterone Deficiency: AUA Guideline. J Urol. 2018;200(2):423-432.
- Travison TG, Vesper HW, Orwoll E, et al. Harmonized Reference Ranges for Circulating Testosterone Levels in Men of Four Cohort Studies in the United States and Europe. J Clin Endocrinol Metab. 2017;102(4):1161-1173.
- Vermeulen A, Verdonck L, Kaufman JM. A Critical Evaluation of Simple Methods for the Estimation of Free Testosterone in Serum. J Clin Endocrinol Metab. 1999;84(10):3666-3672.
This page is general education, not medical advice, and it does not replace a visit with your own clinician. Your diagnosis, treatment and any medication instructions come from your individual care plan. Reviewed by Jessica Boggs, MSN, APRN, FNP-C, ENP-C.
5301 Alpha Road, Suite 34, Dallas, TX 75240 · (469) 653-3124 · contact@navarahealthtx.com · navarahealthtx.com
Told you're fine, still don't feel fine?
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