How to Track Bloodwork on TRT: Estradiol, Hematocrit, and SHBG

If you're on TRT, the most useful bloodwork panel includes total testosterone, free testosterone, estradiol (sensitive assay), hematocrit, and SHBG. Most clinicians retest every 8–12 weeks after a dose change, then every 6 months once levels stabilize. Logging each result next to your dose and injection schedule makes patterns obvious that a single lab printout never will.

Which markers actually matter

Total testosterone gets the headline, but it rarely tells the full story on its own. SHBG (sex hormone-binding globulin) determines how much of that testosterone is actually free and bioavailable. Two people with identical total T can feel very different if one has SHBG of 20 and the other 60.

Estradiol matters because testosterone aromatizes into E2. Too low and you get joint pain, low libido, and poor mood. Too high and you may notice water retention, nipple sensitivity, or emotional volatility. Always request the sensitive assay (LC-MS/MS) — the standard immunoassay can read inaccurately at male ranges.

Hematocrit is the safety marker most users underestimate. TRT can push red blood cell production up, and many providers want it kept under 52–54%. Rising hematocrit is one of the more common reasons to lower a dose or switch from once-weekly to more frequent injections.

How to actually use the data

A single lab draw is a snapshot. The signal lives in the trend. Three things make trend tracking work:

1. Consistent draw timing. Always test at the same point in your injection cycle — for example, the morning before your next shot. Levels swing significantly between peak and trough.
2. Log the protocol alongside the result. A hematocrit of 51 means something different on 200mg/week than on 100mg twice weekly. Without the protocol context, comparing labs is guesswork.
3. Note how you felt. Energy, sleep, libido, mood — these subjective markers often shift before lab values do, and they help explain why your numbers moved.

Many users keep this in a spreadsheet, but spreadsheets fall apart once you're tracking five markers across two years. A private logbook app like Trace keeps doses, lab values, and symptom notes on the same timeline, all stored locally on your device behind Face ID. No cloud, no sharing — just your data.

Frequently Asked Questions

How often should I get bloodwork on TRT?

Most protocols call for full panels at 6–8 weeks after starting or changing a dose, then every 3–6 months once stable. Your prescribing clinician will set the cadence based on your hematocrit trend and how your numbers look.

What's a "trough" lab and why does it matter?

A trough lab is drawn just before your next injection, when testosterone is at its lowest point in the cycle. It's the most reproducible time to test — peak levels can vary widely depending on exact timing, so trough draws make month-over-month comparisons meaningful.

Should I track estradiol if I don't take an aromatase inhibitor?

Yes. E2 still rises and falls with your testosterone dose even without an AI, and many users find symptom changes correlate more with estradiol than with total T. Tracking both lets you see the relationship over time and gives your doctor better information.