What it is: The body's primary iron-storage protein and the standard marker of iron reserves.
Why it matters: It also rises with inflammation, an important nuance, and iron status is a relevant variable in hair and follicle research.
Reference context: Public reference examples vary by lab, assay, sex, age, and inflammation status. Your lab's printed reference range and your provider's read take priority.
Key thing to know: No special fasting is typically required, but because recent illness or inflammation can elevate it, timing around acute illness matters. Interpret with a licensed provider.
What is ferritin?
Ferritin is the protein your body uses to store iron, and the blood ferritin level is the standard way to estimate how much iron is held in reserve. Lower ferritin is generally associated with depleted iron stores, while higher ferritin can reflect either iron overload or — importantly — inflammation, since ferritin is also an acute-phase reactant that rises when the body is inflamed. MedlinePlus notes that a higher ferritin level can result from causes such as inflammation (from infection or surgery), liver disease, or other conditions, which is why interpretation belongs to a licensed provider.
This dual nature is what makes ferritin both useful and easy to misread without proper context.
Because ferritin reflects stored iron rather than the iron actively circulating in the blood, it is usually the first marker checked when assessing iron status, and it gives a more stable picture than serum iron, which fluctuates throughout the day. For a complete view, ferritin is often interpreted alongside a full iron panel (serum iron, total iron-binding capacity, and transferrin saturation), which together help distinguish low stores from problems with iron transport or utilization.
Public reference examples
These are published reference examples cited in the scientific literature, not personal interpretation and not Pepvela cutoffs. Ferritin reference ranges vary by laboratory, assay, sex, age, inflammation status, iron status, and clinical context. Your lab's printed reference range and your provider's interpretation take priority.
Above 150–200 ng/mL (menstruating women)
Because ferritin is an acute-phase reactant, a value in or above the reference range can accompany inflammation as well as iron stores, which is why it is often reviewed alongside an inflammatory marker (such as hs-CRP) and a full iron panel. Reference ranges vary by laboratory, assay, sex, age, and inflammation status. Interpretation belongs to a licensed provider, working from your lab's printed reference range.
Why this marker matters before peptide research.
Iron status is a variable that appears across several research areas, including research into hair and follicles, where iron status is one of the factors studied.
Establishing a ferritin baseline before beginning a research protocol provides context, and tracking that baseline over time is generally more informative than a single reading.
Because ferritin is influenced by both iron stores and inflammation, it is most informative when reviewed alongside other markers by a qualified provider rather than read in isolation.
This dual sensitivity to both iron stores and inflammation is the practical reason a single ferritin value can be difficult to read on its own. In research settings, the clearest picture comes from establishing a baseline and tracking it over time alongside an inflammatory marker such as hs-CRP, so that a rise driven by inflammation is not read as a change in iron stores. It is also worth noting that the reference thresholds discussed in the literature vary by context, which is part of why a baseline and trend matter more than a single in-range or out-of-range reading.
How to get this test.
Where to order
Ferritin is available individually or as part of an iron panel through standard lab providers.
How to prepare
No special fasting is typically required, but follow lab guidance. Because recent illness or inflammation can elevate ferritin, timing around acute illness matters.
What to ask for
A ferritin test, ideally alongside a full iron panel (serum iron, TIBC, transferrin saturation) and an inflammatory marker such as hs-CRP for context.
Peptides commonly researched in connection with this marker.
Markers often reviewed alongside ferritin.
Because ferritin reflects both iron stores and inflammation, it is commonly reviewed alongside markers that add context. Explore the full set in the Biomarkers Library.
Sources
- MedlinePlus. Ferritin Blood Test. U.S. National Library of Medicine. medlineplus.gov
- Iron Overload and Toxicity. StatPearls. NCBI Bookshelf. ncbi.nlm.nih.gov
- Iron Deficiency Anemia. StatPearls. NCBI Bookshelf. ncbi.nlm.nih.gov
Reference examples above are drawn from these public sources and are not personal interpretation. Ranges vary by laboratory, assay, sex, age, inflammation status, iron status, and clinical context.