Peptide Therapy · Reviewed by Ian K. Tseng, MD

Peptide Therapy Bloodwork: What Your Labs Need to Show

Bloodwork is the floor of the program. Before any peptide prescription, your physician needs to see what is true about your physiology — not what is true about your goals.

Published May 14, 2026 · Medical review by Ian K. Tseng, MD, Medical Director

Why bloodwork is required

Soothe IV's peptide program is built around a hard rule: we will not ship a peptide your labs say you should not take. That rule is not a marketing posture. It is the difference between a prescription drug program and an unregulated chemical purchase.

Three reasons your physician orders bloodwork before any prescription:

1. To rule out contraindications. Growth-hormone-axis peptides are not appropriate if your IGF-1 is already elevated or if you have a history of pituitary disease. Metabolic (GLP-1-class) peptides are not appropriate with certain thyroid histories or pancreatitis risk. Bloodwork surfaces these before they become problems.
2. To establish a baseline. Once you start therapy we monitor change. Without a baseline, "is this peptide working?" and "is this peptide safe?" have no anchor. We need the starting numbers before we can tell you what they should look like at 90 days.
3. To detect a treatable problem peptides do not fix. Sometimes the fatigue, weight, or recovery issue someone brings to us is actually thyroid, anemia, or a metabolic abnormality that should be treated directly — not papered over with a peptide.

What each marker is actually looking for

MarkerWhat it rules in or out

IGF-1

Growth-hormone axis

An already-elevated level, or a history of pituitary disease — either makes a growth-hormone-axis peptide inappropriate. It is also the only stable readout of GH activity, since GH itself is released in pulses.

TSH, free T4

Thyroid function

Thyroid disease is a common, treatable cause of the exact fatigue and weight complaints people bring to peptide therapy. It also rules in or out certain metabolic-class histories.

A1c, fasting glucose & insulin

Metabolic

Where a metabolic protocol is being considered, this establishes whether it is appropriate at all — and it is the baseline every follow-up panel is compared against.

Comprehensive metabolic panel

Kidney & liver

Organ function that changes what can be prescribed safely, and that must be monitored if persistent vomiting on a metabolic protocol raises dehydration risk.

CBC with differential

Blood count

Anemia and other findings that explain the presenting symptom directly — a problem to treat, not to paper over.

Lipid panel

Cardiovascular

Cardiovascular risk context, and a baseline for markers that metabolic therapy is expected to move.

What's on a typical baseline panel

The exact panel is set by your physician based on your goals and history. A representative Soothe IV baseline panel includes:

• Complete Blood Count (CBC) with differential — anemia, infection, marrow function.
• Comprehensive Metabolic Panel (CMP) — kidney function, liver enzymes, electrolytes, glucose.
• Lipid panel — total cholesterol, LDL, HDL, triglycerides. Critical before and during GLP-1 therapy.
• Hemoglobin A1c + fasting insulin + fasting glucose — metabolic baseline and GLP-1 eligibility.
• TSH and free T4 (sometimes free T3, reverse T3, antibodies) — thyroid function, often the hidden driver of "fatigue."
• IGF-1 — required before any growth-hormone-secretagogue peptide.
• Vitamin D, B12, ferritin — common deficiencies that mimic peptide-target symptoms.
• hs-CRP — systemic inflammation marker.
• Hormone panel — testosterone (total + free), estradiol, DHEA-S, SHBG when clinically indicated.
• PSA (men over 40) — required before any growth-hormone-axis intervention.

Most lab panels of this scope cost between $150 and $400 cash-pay, billed separately from your Soothe IV membership.

How the draw works

If you've had bloodwork in the last 12 months, upload the results inside your intake form. Your physician reviews what you have first — if the existing panel covers what he needs, no new draw is required and you move straight to your protocol options. If your labs don't cover what he needs, your physician sends a lab order to your email as part of your intake. You walk into any blood-testing center near you (most slots are walk-in; a few require a quick online appointment), the technician draws, and results return to your physician inside 48 to 72 hours. Your physician reviews them before sending your protocol options.

Mobile in-home draws by our hospital-trained RN team are launching for Orange County members.

What we retest, and how often

Repeat labs are drawn at least every 90 days while you are on therapy. Some peptides warrant earlier rechecks:

• Metabolic (GLP-1-class) peptides: 30 to 60 day recheck of glucose, A1c, and lipids during dose titration; full panel at 90 days.
• Growth-hormone-axis peptides: IGF-1, fasting glucose, and lipid panel at 90 days.
• Aesthetic, longevity, and energy peptides: standard 90-day panel with attention to inflammation markers and any baseline finding being tracked.

If your labs say you should not take a peptide

This is uncommon but it happens. When it does, your physician will explain which result is the concern, whether it is something to monitor or treat directly, and whether a different peptide or non-peptide approach is appropriate. We refund your first month in full if you cannot proceed. This is the safety floor of the program.

Why this looks different from research-chemical vendors

Online research-peptide vendors ship vials labeled "for research use only" or "not for human consumption" with no physician, no bloodwork, no prescription. The Certificate of Analysis on a vial tells you what is in the bottle. It does not tell you whether your body should receive it. Our physician-supervised peptide program is structurally different — a pharmacy program that requires a prescription that requires bloodwork that requires a physician — and that difference is what you are paying for when you choose a medical program over a research-chemical kit. If you are new to the topic, start with what peptides are and whether peptides are safe.

Frequently asked questions

This article is educational and is not medical advice. Statements have not been evaluated by the FDA. Peptide therapy is a physician-supervised medical service; specific protocols are determined individually after a Good Faith Examination and bloodwork, and not all applicants qualify. Some compounded medications used in physician-prescribed protocols are not FDA-approved. Data from clinical trials on FDA-approved medications should not be used to make assessments related to compounded medications. Soothe IV's peptide program is available nationwide via telehealth; prescriptions are issued by physicians licensed in your state.