How to Read Your First TRT Bloodwork Without Panicking

Most TRT-focused clinicians look at four numbers before anything else: total testosterone, free testosterone, SHBG, and estradiol. Together they tell you whether your protocol is working, whether your dose is reasonable, and whether you're set up to feel good.

Total testosterone is the sum of all testosterone in your blood. It's the easiest number to push and the one most clinicians anchor to. Reference is 264–916 ng/dL; most TRT protocols aim for the upper half of that range (700–1,100 ng/dL trough).

Free testosterone is the ~1–3% of total T that's not bound to SHBG or albumin. It's the fraction that actually enters cells and binds receptors. Reference: 9–30 pg/mL; TRT optimization target is the upper third (20–30 pg/mL).

SHBG is the protein that binds testosterone in the blood. It's the single biggest determinant of your free T after total T itself. Optimal SHBG for TRT is 20–40 nmol/L.

Estradiol is the primary estrogen in men, made by aromatizing testosterone. Target is 20–35 pg/mL by sensitive (LC-MS/MS) assay — make sure your lab uses that, not the standard ECLIA which reads ~30–50% higher in men.

Your complete blood count tells you whether TRT is doing something to your red cells that needs attention.

Hematocrit (HCT) is the percentage of your blood volume made up of red blood cells. Normal is 38.5–50%. TRT consistently raises HCT — most men land in the high 40s within a year. Above 52% you should be paying attention. Above 54% you need to act: split your dose, lower it, or donate blood.

Hemoglobin and RBC count track with HCT — when one goes up, the others do too. If HCT is fine but HGB or RBC are off independently, look at iron stores or B12.

WBC and platelets rarely change with TRT itself. Persistent abnormalities mean something else is going on (infection, inflammation, autoimmune, occasionally hematologic disease).

MCV, MCH, MCHC, RDW are red cell quality metrics. Useful for spotting iron, B12, or folate deficiencies that anemia panels miss.

Your basic and comprehensive metabolic panels cover glucose handling, electrolytes, kidney and liver function. On TRT, the big metabolic story is usually positive — most men's insulin sensitivity improves and fasting glucose drifts down.

Fasting glucose above 100 mg/dL is prediabetes; above 126 (on two draws) is diabetes. TRT often pulls glucose down by 5–15 mg/dL in men who were trending high.

HbA1c is your three-month average glucose. Optimal is 5.0–5.4%. A small caveat: TRT-induced high hematocrit can artifactually *lower* HbA1c readings, so if your A1c is dropping while your symptoms aren't improving, check your HCT first.

Electrolytes (sodium, potassium, chloride, CO2) are tightly regulated and rarely flag in healthy TRT users.

Albumin and total protein matter for free T calculation. The Vermeulen equation needs albumin to work; if your lab doesn't include it, 4.3 g/dL is a reasonable default.

TRT and lipids have a complicated relationship — much of what was once considered settled has been revised in the last decade.

LDL — the established cardiovascular risk factor. Injectable TRT has a roughly neutral effect; oral and topical can be worse. Above 100 mg/dL is elevated; high-risk patients aim for < 70.

HDL — typically drops 5–15 mg/dL on TRT. Historically this caused alarm. Modern interpretation: HDL is more a marker than a mediator of CV risk. Don't chase HDL with niacin or other interventions just because TRT dropped it modestly.

Triglycerides — usually improve modestly on TRT via better insulin sensitivity. High trigs combined with low HDL flag metabolic syndrome — work on visceral fat and refined carb intake.

ApoB — if your lab measures it, it's a better predictor than LDL of atherogenic particle burden. Aim under 90 mg/dL; under 60 for high-risk patients.

Injectable testosterone is not hepatotoxic. Oral methylated AAS are. So if your ALT or AST are mildly elevated on a TRT-only regimen, the cause is usually diet, alcohol, or a hard workout the day before — not the testosterone itself.

ALT above 56 U/L is worth investigating, especially if persistent. Common causes: fatty liver, alcohol, intense exercise (settles in days), some medications.

AST is similar but also released from muscle and heart. Heavy training routinely raises AST without any liver issue.

GGT is sensitive to alcohol use — useful for catching that.

On the kidney side, creatinine rises with muscle mass (which TRT increases), so a slightly elevated creatinine in a muscular man may not indicate kidney trouble. eGFR corrects for age and sex but still uses creatinine — for muscular men who care about a precise number, ask for cystatin-C-based eGFR.

BUN rises with high protein intake — common among TRT users. Often elevated without indicating problems.

Untreated hypothyroidism is the single most commonly missed reason men don't feel right despite 'perfect' TRT labs. It mimics low T (fatigue, weight gain, low libido) AND raises SHBG (which suppresses your free T).

TSH above 2.5 mIU/L in a symptomatic man warrants checking free T3 and free T4.

If thyroid is genuinely off, fix that first before re-tuning your TRT. Many men's 'I need a higher TRT dose' problem evaporates once they're correctly treated for subclinical hypothyroidism.

LH and FSH are pituitary hormones that drive testicular function. On TRT, both crash to near-zero — that's expected, not a problem. It does mean sperm production stops in most men, so if fertility matters, add hCG (which mimics LH).

Prolactin matters even on TRT. Elevated prolactin (>2x upper limit) suppresses the testosterone axis and causes low libido / ED independently of testosterone levels. If your numbers all look good but libido is off, prolactin is one of the first places to look. Pathologic elevation warrants pituitary imaging.

TRT doesn't cause prostate cancer. But TRT can fuel growth of pre-existing cancer, which is why every man on TRT — especially over 40, or with family history — needs regular PSA monitoring.

Baseline PSA before starting TRT. Recheck at 3 months, 6 months, then annually. PSA velocity (rate of change) matters more than the absolute number. A jump of >1.4 ng/mL within 12 months warrants urology referral.

False elevations are common — avoid ejaculation, prostate exams, and cycling for 48 hours before the draw.

Vitamin D below 30 ng/mL is deficient — supplement to push into the 40–60 range. Correcting deficiency modestly raises testosterone (50–100 ng/dL) in deficient men.

Ferritin is iron stores. TRT increases red cell production, which can deplete iron over time. Persistently low ferritin causes fatigue that mimics low T. Persistently high ferritin combined with high transferrin saturation (>45%) warrants HFE genetic testing for hemochromatosis — a surprisingly common reason men's hematocrit climbs uncontrollably.

B12 and folate below the reference range mimic low T fatigue. Vegetarians, vegans, men on metformin, and chronic PPI users are at risk.

CRP (C-reactive protein) is a marker of systemic inflammation. High-sensitivity CRP (hsCRP) predicts cardiovascular risk. Optimal is < 1.0 mg/L; > 3.0 suggests significant inflammation.

TRT generally lowers CRP modestly via improved body composition and insulin sensitivity. Persistently high CRP on TRT is a flag — usually visceral fat, dental health, or untreated metabolic issues.

The first time you read a TRT bloodwork report it looks overwhelming — 40+ numbers, some flagged, some normal, no obvious priority order. After 6–12 months of tracking, the same report takes you 60 seconds.

The core questions you're answering each time:

• Is my total testosterone where I want it? Total T + Free T + SHBG together • Is my estradiol in the optimal window? Sensitive E2 assay • Is my hematocrit safe? HCT + HGB + RBC • Are my prostate and lipids stable? PSA + LDL/HDL/Trigs • Are there any silent contributors I'm missing? Thyroid + Vitamin D + Ferritin

If all five answers are good, your protocol is dialed. If one or two are off, you have a specific lever to work on. The men who stay on TRT successfully over decades are the men who learn to read their own reports.

A single bloodwork draw is a snapshot. The real value emerges over multiple draws — trends tell you whether your protocol is converging to a stable steady state, whether your hematocrit is creeping up, whether your estradiol is drifting.

This is what MyTRT is built for. Upload your lab PDFs and the app extracts every marker, every range, every unit — and trends them over time alongside your dose history. Free on iOS and Android. Pro adds AI extraction and unlimited history.