Peak / Trough Estimator
Predict Cmax/Tmax and the pre-dose nadir, plus the best window to draw trough bloodwork.
How often you dose — determines the trough interval.
Predicted levels
Peak (Cmax)
at Aug 18, 4 AM
Trough (pre-dose nadir)
at Aug 31, 10 PM
Best trough-bloodwork window
Draw labs around the trough for an accurate baseline reading:
Aug 31, 10 AM — Sep 1, 10 AM
Trough bloodwork reflects the lowest steady-state level — the standard for TRT dosing decisions and GLP-1 titration checks.
Educational use only — not medical advice. Estimates use a linear pharmacokinetic model (Bateman superposition) and assume regular dosing; individual metabolism, body composition, and dose vary results. Time bloodwork with a clinician.
About this tool
The peak/trough estimator predicts the highest (Cmax) and lowest (pre-dose nadir) concentration for a compound on a given schedule, and identifies the best window to draw trough bloodwork — essential for TRT and GLP-1 users timing their labs.
How to use it
- 1 Select a compound and enter your dose.
- 2 Choose your injection schedule and duration.
- 3 Read the predicted peak (Cmax) and trough levels.
- 4 Note the bloodwork-draw window (trough ± 12 hours).
Frequently asked questions
Why draw bloodwork at the trough?
Trough levels reflect the lowest steady-state concentration — the standard for TRT dose decisions and GLP-1 titration checks. Peak labs overstate your average exposure.
How accurate is the prediction?
It uses a linear pharmacokinetic model (Bateman superposition). Individual metabolism, body composition, and dose vary results — treat it as an estimate, confirmed by labs.
Educational use only — not medical advice. Results are estimates based on published formulas and models.