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Reading your first TRT blood test

The five numbers that matter, the order to read them in, and the traps a first panel sets for everyone.

Updated 2026-09-26 · Part of the Magno guides

Your first panel on testosterone lands as a PDF with thirty rows, a few of them flagged in red, and no story. This is the order experienced users read it in.

1. Where in the injection cycle was the draw?

A draw two days after a shot reads high on everything: total testosterone, estradiol, hematocrit. A trough draw, the morning of the next injection, is the honest one. If you do not know when the draw was relative to the shot, the numbers are hard to compare with anything. From now on, draw at trough, same time of day, same lab.

2. Testosterone and its free fraction

Total testosterone above the lab range is normal on TRT at peak and common at trough on a solid dose. What matters is the free testosterone, which tracks how you feel, and SHBG, which explains the gap between the two. High SHBG means the total overstates what is available; low SHBG means the opposite.

3. Estradiol, as a ratio

Do not read estradiol on its own. Divide testosterone (ng/dL) by estradiol (pg/mL). Between 15 and 30 is where most men feel best. Below 15 means a lot of aromatising, usually from big infrequent shots or body fat. Above 30 means estradiol is being held down, usually by an aromatase inhibitor, and crashed estradiol feels worse than high estradiol. Ask for the sensitive assay next time if the lab used the standard one.

4. Hematocrit

This is the number that stops protocols. Under 50 percent is comfortable, 50 to 52 is creeping, over 52 is where doctors order a phlebotomy. It rises with the dose and the size of the peaks, and it reads higher when you are dehydrated. If it is high, donate blood, drink more before the next draw, and think about splitting the weekly dose.

5. Lipids, as a ratio too

Testosterone nudges LDL up and HDL down; orals do it violently. Divide total cholesterol by HDL. Under 3.5 is where people aim, over 5 is the risk zone. If HDL has fallen, cardio and dropping any oral move it back fastest.

Everything else

Liver enzymes are usually training, not liver, unless GGT is up too. Creatinine is usually muscle and creatine, not kidney. PSA a little higher than before TRT is expected in the first year. Fasting glucose and HbA1c matter if you use growth hormone or MK-677.

The trap

One panel is a snapshot. The second panel, drawn the same way, is where the story starts: what moved, by how much, since what change. Keep the PDFs, or better, keep every marker on one line with the change since last time.