What Lab Tests Should You Get Before Starting Peptides?

Get a baseline blood draw before you start peptides. You want IGF-1, fasting glucose and insulin, HbA1c, liver and kidney function, blood counts, cholesterol, thyroid and inflammation. Those numbers show whether growth hormone peptides are working and catch blood sugar changes you cannot feel, and they give you a safety baseline when no proven marker exists.

What's the core baseline panel?

IGF-1 is your starting point for any growth hormone peptide. It is a blood protein your liver makes when growth hormone signals it, and it stays steadier through the day than growth hormone itself. Dr. Onwude lists 88 to 246 ng/mL as typical for adults 30 to 40, and he advises conservative dosing when you start in the upper quartile Dr. Onwude's baseline guide.

The rest of the panel checks metabolism and safety. Fasting glucose with fasting insulin plus HbA1c, your 3-month blood sugar average, show how you handle sugar before treatment. A comprehensive metabolic panel checks liver and kidney function, a complete blood count checks red and white cells, a full lipid panel checks cholesterol and triglycerides, and TSH with free T4 checks thyroid function FormationMed panel breakdown.

Add hs-CRP for low-grade inflammation. You want that number low and stable before you try to read changes in skin, weight or recovery.

Do repair peptides need different labs?

Repair peptides use the same safety labs but you read them differently. A review found only three small human pilots of BPC-157 for knee pain, bladder irritation and IV safety, with no adverse effects reported but no large trials, so the authors call it investigational with no proven blood marker BPC-157 review.

Keep the metabolic panel and blood count for safety and track hs-CRP and ESR, two inflammation markers, alongside pain, function and healing FormationMed panel breakdown. If you are deciding between a growth hormone path and a repair path, bring your recent labs to the HOD quiz to match your numbers to a plan.

When do you recheck?

Draw baseline, recheck at 4 to 6 weeks, then move to quarterly checks TestWell monitoring guide. That schedule fits how IGF-1 behaves. In two controlled trials of CJC-1295, IGF-1 stayed raised for 9 to 11 days after one injection and stayed above baseline for up to 28 days with repeat dosing CJC-1295 trial.

Recheck fasting glucose and insulin on the same schedule because growth hormone signaling can push them up without symptoms you would notice. Compare each draw to your own baseline so dosing decisions start from your numbers.