Five tests, each earning its place — and nothing padding the bill.
A testosterone workup can be a sprawling, expensive battery of tests — or it can be exactly the markers that change the decision in front of you. At Castellano Health Institute the basic panel is kept deliberately lean, on purpose, to save patients money. Here’s what each test in it actually measures, why it’s there, and what’s intentionally left out.
Castellano Health Institute · Serving Orange County
What’s in the panel, and what each one tells the doctor.
Total testosterone
The primary number — whether the body is running short on testosterone. Read against your symptoms and confirmed on two separate mornings, since a single draw swings too much to trust alone.
Estradiol
Testosterone converts to estrogen in the body, and the ratio matters. Measuring estradiol lets the approach be tuned to keep that balance in a healthy place.
LH (luteinizing hormone)
The pituitary signal that tells the testes to produce. It helps distinguish where a low level is coming from — the testes themselves, or the signaling above them.
Complete blood count (CBC)
A baseline picture of your blood, and the way hematocrit — red-cell concentration — is tracked. It's the marker most closely watched once therapy is underway.
PSA
Prostate-specific antigen, checked where age calls for it, as a standard part of prostate safety before and during therapy.
A lean panel is a choice, not a shortcut.
It’s worth being clear about what the basic TRT panel does not include, because some clinics add these by default and bill for them. Thyroid, adrenal, and broader metabolic panels are not part of the standard testosterone workup here. Free testosterone isn’t in the basic panel either — total testosterone answers the primary question.
That’s not cutting corners. It’s the opposite: ordering only the tests that actually change the decision. The wider thyroid-adrenal-metabolic evaluation is a real and valuable thing — it’s just a separate, more extensive service for when the picture is bigger than testosterone alone, and it belongs in the hormone-support workup rather than bolted onto a basic TRT panel. Keeping the two distinct is part of what keeps the standard workup honest and affordable.
The numbers only mean something next to your symptoms.
A lab panel is data, not a diagnosis. A testosterone deficiency is diagnosed by symptoms and labs together — a man can have a low number and feel fine, or real symptoms driven by something other than testosterone. That’s why the panel is confirmed on two separate mornings, when testosterone is at its natural peak, and always read against the clinical picture rather than in isolation.
A commonly used threshold is a total testosterone at or below 300 ng/dL, but the right reference is the normal range of the specific lab running the test. The same panel does double duty later: once therapy is underway, testosterone, estradiol, hematocrit, and PSA become the markers tracked over time. How that monitoring works is laid out on the TRT monitoring guide, and how the whole first visit unfolds is on your first consultation.
A number in range isn’t automatically the right answer.
Every lab result comes with a reference range — the band the lab considers normal for its population. It’s a useful guide, but it’s not a verdict. Reference ranges are wide, they differ from lab to lab, and they describe a population rather than the specific man in the chair. That’s why a testosterone value is never read as a standalone pass-fail number. A commonly cited threshold is a total testosterone at or below 300 ng/dL, but the right reference is always the range of the specific lab running the test, read against your symptoms.
The details of how the draw is done matter just as much as the number it produces. Testosterone follows a daily rhythm and can fall meaningfully from morning to afternoon, so the draw is done in the morning, at the hormone’s natural peak. And because it swings day to day, a low result is confirmed on two separate mornings before it’s trusted. One low afternoon draw, taken in isolation, can suggest a deficiency that a proper morning retest doesn’t support — which is exactly the kind of false signal a careful protocol is built to avoid.
None of the five markers is interpreted alone, either. Testosterone, estradiol, LH, the blood count, and PSA are read as a set, against each other and against your history. It’s the pattern across them — not any single value — that tells the doctor what’s actually going on.
What men ask about the bloodwork.
Don’t see yours? Call the office and ask Dr. Castellano directly.
What tests are in a TRT lab panel?
Why is total testosterone measured instead of free testosterone?
Why does a testosterone panel include estradiol?
What is LH testing for in a TRT workup?
Does the basic TRT panel include a thyroid or metabolic workup?
Why is the panel kept so lean?
How often is the lab panel repeated?
Related in the TRT knowledge cluster.
Your First TRT Consultation
How the panel gets ordered — the one-hour visit and the baseline draw.
TRT Monitoring & Follow-Up
How the same markers are tracked over time once therapy starts.
Low Testosterone
What the panel is looking for — symptoms, causes, and diagnosis.
TRT with Dr. Castellano
The service page — how testosterone replacement therapy is practiced here.
A lean panel, and a price you can see.
The lean lab panel is the same philosophy that runs the whole practice: order only what changes the decision, and be straight about the cost. If therapy is the right call, the ongoing TRT program is a flat $250 a month — medication, ongoing labs, and monthly follow-ups included, no per-lab surcharges and no long-term contract. The one-time initial consultation and first bloodwork is a separate step, handled directly with the office. No mystery add-ons, no bill that balloons.
Mon–Fri 9 AM – 5 PM · Serving Orange County