What to Log
at Every Injection

Per Injection

The Minimum Viable Injection Log

Date and time establish the reference point for bloodwork timing — you want to test mid-cycle relative to your last injection, not peak or trough. Ester type matters because Testosterone Cypionate (half-life ~8 days) and Testosterone Propionate (half-life ~2 days) need different testing windows and produce different peak-to-trough variation. A log that records dose but not ester is incomplete data.

Injection site tracking prevents lipohypertrophy — thickened tissue from repeated injections at the same point. Common TRT sites include the ventrogluteal, vastus lateralis (outer thigh), and deltoid. Rotate systematically and log each site. After months of weekly or twice-weekly injections, the body map matters.

Per Blood Draw

What to Record Alongside Your Labs

Every bloodwork result should be logged against the protocol context at the time of the draw: your current dose, ester type, injection frequency, and how many weeks you've been on that exact protocol. A Total T of 750 ng/dL means different things depending on whether you're at week 3 of a new protocol or week 6 of a stable one.

The minimum bloodwork log: date of draw, days since last injection, Total T, Free T, Estradiol (sensitive assay), and Hematocrit. Add SHBG, Hemoglobin, and PSA at quarterly draws. The relationship between protocol changes and lab trend changes is the data that actually lets you optimize — without the protocol context alongside each draw, you have isolated numbers, not a trend.

See the full bloodwork reference at trttracker.health/trt-bloodwork-guide — includes target ranges, testing frequency, and what each marker indicates.

FAQ

TRT Logging Questions