Blood Tests for Peptide Users: What to Track
The panels people ask about are a complete blood count, a metabolic panel, lipids, HbA1c and fasting glucose, thyroid, hormone panels, IGF-1, and vitamin D, B12 and ferritin. The one credible device on Amazon is the A1CNow HbA1c kit in the US and Canada; everything else comes from a doctor or a proper lab.
Last edited · written by PepPrep · not medical advice
People ask us which blood tests they should get. This is a supplies site, not a clinic, so the honest answer has three parts: what tests people commonly get around peptide use, which of them Amazon can and cannot sell you, and where the proper ones come from in each country. Your doctor decides what you need and reads the results; this page just makes that conversation shorter.
The panels people ask about
- Complete blood count (CBC / FBC) — the general health screen.
- Metabolic panel (CMP / U&E and LFTs) — kidneys, liver and electrolytes: sodium, potassium, and the liver enzymes.
- Lipids — cholesterol and triglycerides.
- HbA1c and fasting glucose — blood sugar over three months and right now. The one most asked about on weight-loss peptides.
- Thyroid (TSH, free T4) — commonly checked when weight is changing.
- Hormone panels — testosterone, oestradiol and related, for people on anything hormone-adjacent.
- IGF-1 — the marker doctors use around growth-hormone-type therapies.
- Vitamin D, B12, ferritin — the ones that drop when meals shrink; see the supplements guide.
Which of these apply to you is a doctor's call. What you can do is know the names, so you can ask.
What Amazon offers, honestly
Most of what comes up in the Amazon stores is ten-minute finger-prick "rapid" kits for vitamin D, iron or thyroid. They give a yes/no line, and we do not list them; a wrong reassurance is worse than no test. The one credible device is the A1CNow, made by the company that makes the clinic version, sold in the US and Canada. Mail-in lab panels are barely on Amazon and the ones that are have thin reviews. Everything else worth having comes from a real lab.
Where the proper tests come from
- United States: your doctor, or direct-to-consumer ordering from the big labs (Quest and Labcorp both sell panels online and you walk in to a draw centre). Prices are listed up front.
- Canada: a requisition from your doctor or a walk-in clinic, drawn at LifeLabs or Dynacare. Private online ordering exists in some provinces.
- United Kingdom: your GP for anything clinical; private finger-prick-to-lab services (the well-known ones post you a kit and a proper lab runs it) for routine panels.
- European Union: your GP (the Hausarzt in Germany) or a private lab; several EU mail-in lab services run accredited panels.
- Australia: your GP for a Medicare-covered request; private pathology providers take direct requests for routine panels.
Before the draw
- Ask whether to fast; lipids and glucose usually mean nothing to eat for 8–12 hours, water is fine.
- Tell the lab if you take biotin: high doses interfere with thyroid and heart tests and the lab cannot tell. Whether to pause it beforehand depends on the test, so ask.
- Go at the same time of day for repeat tests, morning if you can; several hormones swing through the day.
- Tell the lab and the doctor everything you take, supplements included.
After the draw
Keep the PDF. A single result is a snapshot; two or three over months are a trend, and the trend is what matters. Bring them to the doctor rather than a forum, alongside anything you noted from injection side effects and flushing — a symptom and a number together are far more use than either alone. Flags on a lab sheet are set for the general population and are not a diagnosis on their own, and a value just outside the range is a question, not a verdict.
Supplies mentioned: Measuring & Tracking
Equipment only: nothing on this page is advice about what to inject, how much, or whether a product is fit to use. That comes from the product's labelling and whoever supplied it.