Reading your first TRT panel: what to look at and what to skip

You sent off a panel and the report came back four pages long. There are values flagged in red, values flagged in yellow, normal-looking values with weird reference ranges, and three biomarkers your clinic never explained.

Here's the order to read it in, what each value actually means for TRT, and what to skip on a first pass.

The top six · read these first

These are the values that drive protocol decisions. Read them, in this order, every time.

1. Total testosterone

What it is: The total amount of testosterone in your bloodstream, bound and unbound, ng/dL.

What "normal" is: Most reference ranges show 264–916 ng/dL for adult males. That range is wide because it spans 18-year-olds and 80-year-olds. For TRT-optimized targeting, the goal is typically 700–1100 ng/dL at trough for symptomatic relief.

The catch: Reference ranges assume you're a treatment-naive natural producer. Once you're on exogenous T, the ranges shift in clinical relevance but not in lab text.

2. Free testosterone

What it is: The unbound, biologically active fraction. The one your tissues can actually use.

What "normal" is: Direct measurement is messy. Most labs use a calculation (Vermeulen formula) that uses total T, SHBG, and albumin. The optimized range is around 15–25 ng/dL for symptomatic relief, but lab-by-lab variance is large.

The catch: Calculated free T isn't always reliable. Equilibrium dialysis is the gold standard but rarely ordered. If your total T is high but you feel flat, your free T is the real story · and it might be lower than you'd expect if your SHBG is high.

3. SHBG (sex hormone-binding globulin)

What it is: A binding protein that holds testosterone in inactive form. The higher your SHBG, the lower your free T proportionally.

What "normal" is: 10–57 nmol/L. TRT users often run lower than baseline. Anything above 40 nmol/L typically means high total T is masking low free T · you may feel flat despite "good" total numbers.

The catch: SHBG is highly responsive to liver function, thyroid status, and insulin sensitivity. A sudden jump usually means something else changed · not your TRT dose.

4. Estradiol (E2 sensitive, LC-MS/MS)

What it is: Estrogen. Yes, men need it. Yes, TRT raises it because aromatase converts a fraction of T into E2.

What "normal" is: For TRT-optimized males, 20–45 pg/mL is the sweet spot. Below 20, you'll feel flat, joints will ache, libido drops. Above 50, you may get water retention, mood lability, gyno risk.

The catch: You have to order the sensitive E2 (LC-MS/MS), not the standard immunoassay E2. The standard test is designed for females and reads inaccurately at male ranges.

5. Hematocrit (HCT)

What it is: Percentage of your blood that is red blood cells.

What "normal" is: 38.3–48.6% for males. TRT pushes this up · exogenous T stimulates erythropoiesis. Above 52% is the rough cutoff where most clinicians start thinking about therapeutic phlebotomy.

The catch: This is one of the few values where TRT has a real safety risk if ignored. Chronically high hematocrit (>54%) increases thrombosis risk. If yours is creeping up, the protocol fix is either dose reduction, more frequent injections (smaller peaks), or scheduled blood donation.

6. Lipid panel (LDL, HDL, triglycerides)

What it is: Your cholesterol numbers.

What "normal" is: LDL < 100, HDL > 40, triglycerides < 150. TRT can drop HDL slightly and raise LDL. Most users see a modest negative shift that's clinically minor.

The catch: If your numbers shift dramatically (HDL down 15+ points, LDL up 40+), look at lifestyle factors first · diet, alcohol, training volume. TRT alone rarely moves lipids this much.

The mid-tier · read these for context

Free T3 / Free T4 / TSH

Thyroid status affects how you feel on TRT. Low T3 can mimic low T symptoms. If you're symptomatic at "good" T numbers, get a full thyroid panel.

Cortisol (AM)

High cortisol pushes SHBG up and free T down. Low cortisol leaves you flat. AM cortisol between 10–18 μg/dL is typical. Outside that range, your TRT response gets hard to read.

IGF-1

A growth hormone marker. Useful baseline. Some peptide protocols (MK-677, CJC-1295, sermorelin) move it.

Prolactin

Should be low. High prolactin (>15 ng/mL in males) needs follow-up · usually a prolactinoma workup, occasionally an indication of high aromatase activity.

LH / FSH

Pre-TRT, these tell you whether your low T is primary (testicular) or secondary (pituitary). Post-TRT, they'll be suppressed · that's expected, not a finding.

What to skip on a first read

Most TRT panels include 20+ markers. Some are routine bloodwork that matters for general health but doesn't drive TRT protocol decisions:

• CBC components (WBC, RBC, platelets) · for general health
• CMP (electrolytes, kidney function, liver enzymes) · for general health
• PSA · useful but moves slowly
• DHT · interesting, rarely actionable
• Pregnenolone · rarely actionable for most protocols

These matter for general health but they don't change what you do next with your TRT dose.

How to interpret the trend, not the value

A single panel is a snapshot. The protocol decision happens when you have 2–3 panels at the same draw timing (trough day, fasted, same lab).

A user might see:

• Panel 1 (Jan): Total T 1100, E2 35, HCT 49, SHBG 24
• Panel 2 (Apr): Total T 1050, E2 42, HCT 51, SHBG 22
• Panel 3 (Jul): Total T 1020, E2 48, HCT 53, SHBG 21

The total T trend is flat · but E2 is climbing, HCT is creeping up, SHBG is dropping. The fix isn't a T dose change. It's more frequent injections (smaller weekly peaks lower aromatization), and possibly a phlebotomy if HCT hits 54.

Regimio's lab tab in Pro builds this trend automatically. Drop in a Quest, LabCorp, or Function Health PDF, and the relevant biomarkers get parsed and plotted against your protocol timeline. You see what changed when.

The trough-day caveat

None of these numbers mean anything if you don't know when in your cycle you drew. A peak total T of 1400 is meaningless; the trough is what your body sees most of the time. Trough-day blood draws is the prerequisite for interpreting any of this.

What Regimio does with your panel

When you log a lab result · manually or via PDF import (Pro) · Regimio:

1. Tags the draw as trough, peak, random, or fasted based on your protocol
2. Plots it on a chart with your protocol timeline as the X-axis
3. Computes adherence percentage for the period covered by that panel
4. Flags any value outside the optimized TRT range (not the lab's general range)
5. Includes everything in the doctor PDF export for your next clinic visit

Trust your timing first. Trust your trend second. Trust a single value last.

The trough-day blood draw guide is essential reading before your next panel. And if you want the broader stack context, the GLP-1 ladder post covers the metabolic side.