July 5, 2026
Peptide Bloodwork: Which Panels Map to Which Compounds, and When to Test
A practical cheat sheet for baseline and follow-up labs on common peptide and GLP-1 protocols — what to test, why, and how to line results up against your dose log.
Tracking doses and side effects tells you how you feel. Bloodwork tells you what is happening underneath. One of the most-upvoted peptide threads of the last month was a full bloodwork cheat sheet — clear evidence that people want to connect compounds to the labs that actually reflect them. Here is a practical version.
The principle: baseline first, then follow up
The single most useful habit is a baseline panel before you start anything. Without a "before" number, a follow-up result is just a number floating in space. Test before, then re-test on a schedule that matches the compound.
General baseline panel (almost everyone)
Regardless of compound, a sensible baseline usually includes:
- Complete blood count (CBC)
- Comprehensive metabolic panel (CMP) — includes glucose, kidney, and liver markers
- Lipid panel
- HbA1c (average blood glucose)
- Fasting insulin
Compound-to-panel cheat sheet
| Compound class | Most relevant markers | Why |
|---|---|---|
| GLP-1s (semaglutide, tirzepatide) | HbA1c, fasting glucose, fasting insulin, lipids | These are the metabolic outcomes the drugs act on |
| GH peptides (CJC-1295, ipamorelin) | IGF-1, fasting glucose, HbA1c | IGF-1 is the downstream marker of GH activity; watch glucose |
| Repair peptides (BPC-157, TB-500) | CBC, CMP (liver/kidney) | General safety monitoring; no specific efficacy marker |
| Any injectable protocol | CMP (liver, kidney), CBC | Baseline organ-function safety check |
Note that IGF-1 is the practical stand-in for "is this GH peptide doing anything?" — GH itself is pulsatile and hard to measure on a random draw, so IGF-1 is the steadier signal.
When to re-test
Timing should match how fast the compound acts:
- GLP-1s: HbA1c reflects roughly 3 months of glucose, so re-testing it sooner than about 8 to 12 weeks tells you little. Fasting glucose and lipids can be checked earlier.
- GH peptides: IGF-1 can be re-checked after a few weeks at a stable dose.
- Safety markers (CMP, CBC): a follow-up after 8 to 12 weeks on any new protocol is a reasonable general habit.
Line the labs up against your log
A lab result is far more useful next to your dose history. If HbA1c dropped, was the last month at a stable dose or mid-titration? If a liver marker moved, what else changed — a new compound, a new supplier batch? The value is in the overlay, not the isolated number.
Draw-day tips
- Fast if the panel calls for it (glucose, insulin, lipids usually do).
- Be consistent — same lab, similar time of day, similar hydration.
- For GH peptides, note your last dose timing relative to the draw.
TrackPep lets you record lab values alongside your dose and weight history, so a bloodwork result sits on the same timeline as the protocol that produced it — not in a separate spreadsheet.
Educational only — not medical advice. Lab interpretation belongs with a licensed healthcare provider. Reference ranges and appropriate panels vary by individual.