Peptide Therapy Monitoring Panel

Your body's response — IGF-1, hormones, metabolic and organ markers. It cannot verify the identity, purity, or concentration of what's in a vial; that's a chemical assay (mass spec / HPLC) from a substance-testing lab, not a medical blood test. See the peptide therapy bloodwork guide for the full distinction.

It's built for GH-releasing peptides (CJC-1295, ipamorelin, sermorelin, MK-677), BPC-157 and repair peptides, and hormone-adjacent stacks. IGF-1 is the standout efficacy marker for the GH group. If you're only on a GLP-1 for weight loss, the GLP-1 Monitoring panel is purpose-built and cheaper — see the GLP-1 lab monitoring guide.

For injectable peptides, draw at trough — right before your next scheduled dose — so results are comparable over time. Fast 10-12 hours (water is fine) and aim for a morning draw before 10 AM for accurate cortisol and hormone levels. A baseline before you start is the single most valuable draw.

Many research peptides, including BPC-157, are not FDA-approved for general human use and have limited human safety data — so no one can promise they're safe for you. Bloodwork can't change that, but it's the practical harm-reduction tool: baseline and periodic organ, blood, and inflammation markers catch problems early. There's no test that measures BPC-157 itself — see the BPC-157 bloodwork guide.

The standard cadence is baseline (before starting), a follow-up at 4-6 weeks, then quarterly for as long as you're on the protocol. Because peptide therapy is ongoing, monitoring is ongoing — many users set up a recurring quarterly plan so the retest happens automatically rather than being remembered.

$259.99 at Quest for all 53 biomarkers (19 tests) — roughly half the ~$500 Quest Direct charges for the equivalent. HSA/FSA eligible, no doctor's visit or referral needed.

Your body. It measures how your physiology is responding to a peptide — IGF-1, hormones, metabolic and organ markers. It cannot verify the identity, purity, or concentration of what's in a vial; that's analytical chemistry from a substance-testing lab, not a medical blood test.

For injectable peptides, draw at trough — right before your next scheduled dose — so every draw is comparable over time. Fast 10-12 hours (water is fine) and aim for a morning draw before 10 AM for accurate cortisol and hormone levels.

The Peptide Therapy Monitoring Panel is built for GH-releasing peptides, BPC-157, and hormone-adjacent stacks — it leads with IGF-1 and a full hormone workup. The GLP-1 Monitoring panel is purpose-built for semaglutide/tirzepatide weight-loss therapy and is cheaper if that's all you're on. Choose by what you're actually taking.

TestWell takes no position on how you obtain peptides, and many research peptides aren't FDA-approved for general human use. What's true regardless: the less clinical oversight your source comes with, the more valuable independent monitoring is — baseline and quarterly bloodwork is how you catch a problem before it's serious. Every result is physician-reviewed.

Peptide Therapy Monitoring Panel results are typically ready in 2–4 business days after your draw at Quest or Labcorp. TestWell emails you the moment they post, and your results dashboard shows each marker against its reference range with a plain-English explanation.

Yes. Fasting for 10–12 hours is required. Morning blood draw (before 10 AM) is preferred for accurate cortisol and hormone levels. Water is okay. If on injectable peptides, draw blood at trough (before next dose) for most accurate baseline.

Oral contraceptives and estrogen, smoking and nicotine and keto and high-protein diets can change a Peptide Therapy Monitoring Panel result without anything being wrong. Oral contraceptives and estrogen can raise SHBG and Free T3 and 4 more markers on this test and can lower DHEA-Sulfate and Estradiol — expected; interpret testosterone with it. Smoking and nicotine can raise RBC and WBC and 3 more markers on this test and can lower HDL Cholesterol and 25-Hydroxy Vitamin D — tell the clinician; a high hematocrit in a smoker is usually smoking, not polycythemia. Keto and high-protein diets can raise LDL Cholesterol and HDL Cholesterol and 2 more markers on this test and can lower Triglycerides, Sodium and Glucose — recheck with ApoB; discuss cardiovascular risk rather than dismissing the rise as 'diet noise'. Each factor is covered on our physician-reviewed "Before your test" pages; when one applies, the fix is usually to remove it and retest.