Can ferritin be normal in a patient who is iron deficient?

Yes — and this is the most clinically important limitation of ferritin interpretation. Ferritin is a positive acute phase reactant, and systemic inflammation from any cause — infection, rheumatoid arthritis, inflammatory bowel disease, cancer, CKD, or metabolic syndrome — elevates ferritin independently of iron stores. A patient with iron deficiency and concurrent inflammatory disease may have a 'normal' ferritin of 50–100 ng/mL masking absent iron stores. Transferrin saturation below 16–20% identifies iron-restricted erythropoiesis even when ferritin is normal or elevated in an inflamed patient. A concurrent hs-CRP measurement is essential when interpreting ferritin in any patient with chronic inflammatory disease.

What ferritin level is considered optimal in functional medicine compared to the standard reference range?

Mainstream haematology defines iron deficiency at ferritin below 12–15 ng/mL. Functional medicine practitioners apply substantially higher targets — typically 70–150 ng/mL for premenopausal females and 100–200 ng/mL for males — based on observational data associating low-normal ferritin (12–50 ng/mL) with fatigue, hair loss, restless legs, cold intolerance, and thyroid hormone synthesis impairment even when haemoglobin is normal. These functional optimal targets are not endorsed as supplementation thresholds in mainstream haematology guidelines; practitioners applying them should communicate the evidence basis clearly and distinguish them from the diagnostic deficiency threshold.

What does an elevated ferritin result indicate?

Elevated ferritin above the sex-specific upper limit requires systematic interpretation using transferrin saturation. Elevated ferritin with elevated transferrin saturation (>45%) indicates iron overload — most commonly hereditary haemochromatosis — requiring HFE gene testing and specialist assessment. Elevated ferritin with normal transferrin saturation is more commonly caused by systemic inflammation, liver disease, alcohol use, haematological malignancy, or the genetic hyperferritinaemia-cataract syndrome than by iron overload, and warrants investigation for these secondary causes before haemochromatosis evaluation.

What is haemochromatosis and how does ferritin help diagnose it?

Hereditary haemochromatosis is the most common single-gene disorder in populations of Northern European descent — affecting approximately 1 in 200–300 individuals — caused by HFE gene mutations (most commonly C282Y homozygosity) that dysregulate hepcidin-mediated iron absorption, producing progressive iron accumulation in liver, heart, pancreas, joints, and pituitary. Elevated ferritin alongside elevated transferrin saturation (>45%) in the absence of inflammatory or hepatic cause is the primary biochemical signal prompting HFE gene mutation testing. Early detection and regular therapeutic phlebotomy to maintain ferritin below 50 ng/mL prevents end-organ damage entirely.

Is fasting required before a ferritin test?

No. Fasting is not required for serum ferritin — ferritin is not affected by recent dietary intake. If concurrent serum iron and transferrin saturation are also being ordered (for a complete iron panel), a 9–12 hour fast is recommended for serum iron, which is subject to postprandial variation. Current oral iron supplementation timing should be documented, as recent supplementation transiently elevates ferritin.

How long does it take to receive ferritin results from LabCorp?

Results are typically available within 1–2 business days from specimen receipt at the LabCorp processing laboratory. Serum ferritin is a high-throughput automated immunoassay.

What causes extremely high ferritin levels above 1000 ng/mL?

Ferritin above 1000 ng/mL in the absence of confirmed iron overload or haemochromatosis most commonly indicates severe hepatic disease (fulminant hepatitis, hepatocellular carcinoma), haematological malignancy (particularly haemophagocytic lymphohistiocytosis — HLH — a diagnostic emergency when ferritin exceeds 500–10,000 ng/mL in an acutely unwell patient with fever and cytopenias), adult-onset Still's disease, or severe systemic sepsis. Extreme hyperferritinaemia requires urgent clinical evaluation including FBC, liver function tests, LDH, and assessment for HLH diagnostic criteria rather than attributing solely to iron stores without investigation.

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Ferritin, Serum

The Ferritin Serum test quantifies the primary iron storage protein in serum — the most sensitive single marker for iron deficiency, detecting depleted iron stores before haemoglobin or MCV become abnormal. Ferritin below 12–15 ng/mL confirms absent iron stores; below 30 ng/mL is highly specific for iron deficiency regardless of inflammatory status.

Biomarkers

Blood (serum)

Sample

1–2 business days

Turnaround

No — fasting is not required for serum ferritin measurement. However, if concurrent iron studies (serum iron, TIBC, transferrin saturation) are also being ordered, a 9–12 hour fast is recommended as serum iron is subject to postprandial variation. Ferritin itself is not meaningfully affected by fasting status. Recent oral iron supplementation timing should be documented on the requisition form.

Fasting

What is the Ferritin test?

The Ferritin Serum test quantifies the primary iron storage protein in serum, providing the most sensitive single-marker assessment of body iron reserve status available through routine clinical laboratory networks. Ferritin is ordered across a wide clinical spectrum — from confirming suspected iron deficiency anaemia to investigating elevated ferritin in haemochromatosis or inflammatory disease — and serves as the definitive iron status baseline measurement from which supplementation decisions, treatment monitoring, and investigation pathways are initiated. Ferritin occupies a unique position in clinical biochemistry because its clinical utility operates at both extremes of the result range with distinct diagnostic implications. At the low end, even a modestly reduced ferritin — below 30 ng/mL — is highly specific for iron deficiency regardless of whether anaemia has yet developed, enabling pre-anaemic iron depletion to be identified and treated before haemoglobin falls. At the high end, markedly elevated ferritin — particularly when accompanied by elevated transferrin saturation — is the primary biochemical signal for hereditary haemochromatosis, the most common single-gene disorder in populations of Northern European descent, affecting approximately 1 in 200–300 individuals and causing progressive iron-mediated organ damage to the liver, heart, pancreas, and joints that is fully preventable through phlebotomy when detected early. Between these extremes, ferritin in the normal range in the context of systemic inflammation is a critically important interpretive challenge — because inflammation elevates ferritin independently of iron stores, a 'normal' ferritin in an inflamed patient may reflect iron deficiency masked by inflammatory upregulation, the clinical scenario in which full iron panel assessment (serum iron, TIBC, transferrin saturation) alongside inflammatory markers is mandatory.

What does the Ferritin test measure?

Ferritin(Ferritin, Serum)

Range: Female (18–39): 10–154 ng/mL; Female (≥40): 13–150 ng/mL; Male (18+): 22–322 ng/mL # REVIEWER FLAG: Confirm LabCorp sex-specific and age-stratified ferritin reference ranges — LabCorp applies age-banded female ranges and a broader male range reflecting higher physiological iron stores in males; confirm exact age bands and lower/upper limits from LabCorp's current assay documentation. Confirm assay methodology — most platforms use electrochemiluminescence immunoassay (ECLIA) or chemiluminescent microparticle immunoassay (CMIA); confirm which LabCorp uses, as methodology affects calibration and may produce slightly different absolute values from other platforms.Optimal: Functional medicine optimal: 70–150 ng/mL (females); 100–200 ng/mL (males) — reflecting replete iron stores with full cellular iron-dependent enzyme saturation and symptom resolution in most patients. Many integrative practitioners target a minimum of 50 ng/mL for women with fatigue, hair loss, or thyroid-related symptoms, and above 70 ng/mL for optimal erythropoietic support and hair follicle cycling. # REVIEWER FLAG: The 70–150 ng/mL functional optimal for females substantially exceeds the mainstream lower limit of normal (10–12 ng/mL) and is not endorsed as a supplementation target in mainstream haematology guidelines — reviewer to confirm appropriate framing distinguishing the functional optimal from the diagnostic deficiency threshold, and whether the hair loss and fatigue associations for low-normal ferritin should be cited with specific evidence references.ng/mL / µg/L

Ferritin is a 24-subunit spherical nanocage iron storage protein — composed of variable ratios of heavy (H) and light (L) chain subunits — capable of sequestering up to 4,500 iron atoms per molecule in a soluble, non-toxic ferric oxyhydroxide core. It is the principal intracellular iron storage and buffering protein, expressed in virtually all cell types but most abundantly in hepatocytes (primary iron storage depot), reticuloendothelial macrophages (recycling senescent erythrocytes), and intestinal enterocytes. A small glycosylated fraction of intracellular ferritin is secreted into the circulation — serum ferritin — whose concentration is directly proportional to total body iron stores under steady-state conditions and constitutes the most practical clinical index of iron reserve. Iron regulatory proteins (IRP1 and IRP2) post-transcriptionally control ferritin synthesis through iron-responsive element (IRE) binding — when intracellular iron is abundant, IRP binding is suppressed and ferritin mRNA is translated; when iron is scarce, IRP binding blocks ferritin translation. Ferritin also functions as an acute phase reactant — its synthesis is upregulated by interleukin-1β, interleukin-6, and TNF-α through transcriptional mechanisms independent of the IRP-IRE system — meaning serum ferritin rises with systemic inflammation, infection, liver disease, and malignancy independently of iron stores.

Ferritin is the most sensitive and specific single serum marker for iron deficiency — falling below normal before haemoglobin, MCV, serum iron, or transferrin saturation become abnormal, enabling detection of depleted iron stores in the pre-anaemic phase when intervention is most effective and least disruptive. A ferritin below 12–15 ng/mL confirms absent iron stores with near-certainty and requires no additional iron status confirmation. Conversely, ferritin is an indispensable marker for iron overload assessment — elevated ferritin with high transferrin saturation triggers HFE gene mutation testing for hereditary haemochromatosis. In functional and integrative medicine, ferritin carries significant clinical actionability at concentrations well above the reference range lower limit — values in the 12–50 ng/mL range that are technically 'within normal' but functionally insufficient for optimal cellular iron-dependent processes (erythropoiesis, thyroid hormone synthesis, mitochondrial function, neurotransmitter production, hair follicle cycling) are a primary clinical focus in fatigue and symptom assessment, particularly in premenopausal women. The dual identity of ferritin as both an iron status marker and an acute phase reactant requires concurrent inflammatory marker assessment for accurate iron status interpretation in patients with chronic disease.

Why is the Ferritin test ordered?

Iron deficiency anaemia diagnosis and confirmation — ferritin below 12–15 ng/mL confirms absent iron stores with high specificity and establishes the basis for iron repletion therapy; it is the most efficient single marker for confirming iron deficiency anaemia aetiology when haemoglobin is low and MCV is low or normal
Pre-anaemic iron store depletion detection — ferritin in the 12–50 ng/mL range in a symptomatic patient with fatigue, hair loss, cold intolerance, restless legs, or impaired exercise tolerance where iron store depletion is the clinical target even before haemoglobin falls; this is the primary clinical application of the functional medicine optimal range
Iron supplementation monitoring — serial ferritin at 4–8 week intervals to confirm adequate iron store repletion during oral or intravenous iron therapy; target ferritin levels and monitoring intervals depend on the clinical indication and the degree of initial depletion
Hereditary haemochromatosis screening and monitoring — elevated ferritin (>200 ng/mL in females, >300 ng/mL in males) alongside elevated transferrin saturation (>45%) in a patient without inflammatory cause triggers HFE gene mutation testing (C282Y homozygosity); serial ferritin monitors iron-depletion progress during phlebotomy therapy
Anaemia of chronic disease differential diagnosis — ferritin combined with serum iron and TIBC differentiates iron deficiency anaemia (low ferritin, high TIBC) from anaemia of chronic disease (normal or elevated ferritin from inflammatory upregulation, low TIBC) in patients with chronic inflammatory, infectious, or malignant conditions
Premenopausal women with menorrhagia or heavy menstrual bleeding — ferritin to screen for iron store depletion from ongoing menstrual iron losses before anaemia develops; the most prevalent nutritional deficiency in this population and the most readily preventable
Bariatric surgery and malabsorptive condition post-operative monitoring — ferritin as the iron status monitoring marker in patients following Roux-en-Y gastric bypass, sleeve gastrectomy, Whipple procedure, or with coeliac disease, Crohn's disease, or short bowel syndrome where iron absorption is chronically impaired
Hyperferritinaemia investigation — unexplained elevated ferritin in the context of normal or low transferrin saturation to investigate non-iron-overload causes: systemic inflammation (hs-CRP, ESR assessment), alcoholic or non-alcoholic liver disease, haematological malignancy (particularly haemophagocytic lymphohistiocytosis — HLH — when ferritin exceeds 500–10,000 ng/mL), and adult-onset Still's disease

Sample collection and turnaround

Sample type

Blood (serum)

Fasting required

Collection method

Venipuncture at patient service centre

Turnaround

1–2 business days

Collection notes

Standard venipuncture into a serum separator tube (SST / gold top). No special preparation or timing requirements. Document on the requisition form: (1) current iron supplementation — type, dose, and duration — as recent supplementation transiently elevates ferritin; (2) known chronic inflammatory, autoimmune, or infectious conditions — essential for interpreting normal or elevated ferritin in the inflammatory context; (3) liver disease history — alcoholic, viral, NAFLD, or autoimmune hepatitis; (4) known haematological malignancy or haemophagocytic features; (5) alcohol consumption history; (6) current or recent acute illness, hospitalisation, or surgery within the preceding 4 weeks — all elevate ferritin through acute phase response. # REVIEWER FLAG: Confirm LabCorp SST tube type, minimum serum volume, centrifugation and separation requirements, and specimen stability data for ferritin before publication.

Specimen requirements

Minimum 0.5 mL serum. Centrifuge and separate serum from cells within 2 hours of collection. Stable at 2–8°C for up to 7 days; stable frozen at −20°C for extended storage. # REVIEWER FLAG: Confirm minimum volume and stability data with LabCorp assay documentation.

What can affect Ferritin results?

elevatesAcute phase response and systemic inflammation — the dominant clinical confounder

Ferritin is a positive acute phase reactant whose hepatic synthesis is strongly upregulated by pro-inflammatory cytokines — interleukin-1β, interleukin-6, and TNF-α — through transcriptional pathways completely independent of iron stores. Any condition producing systemic inflammation elevates ferritin independently of body iron: active infection, rheumatoid arthritis, inflammatory bowel disease, SLE, malignancy, chronic kidney disease, and metabolic syndrome with adipose-driven low-grade inflammation all elevate ferritin in proportion to inflammatory activity. This is the most clinically consequential ferritin interference — a patient with iron deficiency and concurrent active inflammatory disease may present with a 'normal' ferritin of 50–100 ng/mL, masking absent iron stores. Concurrent hs-CRP or ESR measurement is mandatory for accurate ferritin interpretation in any patient with known or suspected chronic inflammatory or infectious disease. A ferritin below 30 ng/mL is diagnostic of iron deficiency regardless of inflammatory status; ferritin 30–100 ng/mL in the context of elevated hs-CRP warrants further iron panel assessment rather than reassurance.

elevatesLiver disease — hepatic ferritin release

Hepatocytes are the primary intracellular ferritin storage depot — any hepatic parenchymal injury, inflammation, or necrosis releases intracellular ferritin into the circulation independently of iron stores. Acute hepatitis (viral, alcoholic, autoimmune, or ischaemic), cirrhosis, non-alcoholic steatohepatitis, and hepatocellular carcinoma all produce ferritin elevations — sometimes markedly — that reflect hepatocellular injury rather than iron overload. Liver function tests (ALT, AST, ALP, bilirubin) must be assessed alongside ferritin whenever hepatic disease is a plausible contributor to hyperferritinaemia.

elevatesHaematological malignancies and haemophagocytic lymphohistiocytosis (HLH)

Haemophagocytic lymphohistiocytosis — a life-threatening hyperinflammatory syndrome triggered by infection, malignancy, autoimmune disease, or genetic immunodeficiency — produces extreme ferritin elevation, typically above 500 ng/mL and often above 10,000 ng/mL, through massive macrophage activation, erythrophagocytosis, and ferritin release from activated histiocytes. A ferritin above 500 ng/mL in an acutely unwell patient with fever, cytopenias, and organomegaly must raise clinical suspicion for HLH as a diagnostic emergency. Other haematological malignancies — acute leukaemia, lymphoma, multiple myeloma — produce moderate ferritin elevation through malignant cell ferritin secretion and tumour-associated inflammation.

elevatesAlcohol consumption

Chronic alcohol use elevates ferritin through multiple mechanisms: direct hepatotoxic injury releasing hepatic ferritin, alcohol-driven increased intestinal iron absorption, and alcohol-associated macrophage activation producing pro-inflammatory cytokine elevation. Heavy drinkers may have ferritin in the range of 200–500 ng/mL without iron overload — alcohol history is an essential confounding variable when interpreting moderately elevated ferritin. Transferrin saturation remains normal or modestly elevated in alcohol-associated hyperferritinaemia, distinguishing it from the high transferrin saturation pattern of hereditary haemochromatosis.

elevatesOral iron supplementation timing

High-dose oral iron supplementation — particularly ferrous sulphate, ferrous gluconate, or ferrous fumarate — can transiently elevate serum ferritin within days to weeks of initiation, reflecting iron being absorbed and stored before it has been incorporated into haemoglobin. This is not a spurious interference but a genuine reflection of iron loading and should not be mistaken for inflammatory or pathological ferritin elevation. Ferritin monitoring during iron supplementation should document the current dose and duration for accurate treatment response interpretation.

elevatesHyperferritinaemia-cataract syndrome (HCS) — hereditary cause of elevated ferritin without iron overload

Hereditary hyperferritinaemia-cataract syndrome is an autosomal dominant condition caused by mutations in the IRE (iron-responsive element) of the ferritin L-chain mRNA, disrupting IRP-mediated translational repression and causing constitutively elevated ferritin production independent of iron stores. Patients with HCS have markedly elevated ferritin (often 800–4000 ng/mL) with normal transferrin saturation and normal iron stores, and develop bilateral nuclear cataracts in the second to fourth decades of life. This condition is frequently misdiagnosed as hereditary haemochromatosis, leading to unnecessary phlebotomy. # REVIEWER FLAG: HCS is an underdiagnosed condition that should be considered in any patient with markedly elevated ferritin and normal transferrin saturation — reviewer to confirm whether this caveat is appropriately prominent given its clinical impact.

What do Ferritin results mean?

Elevated

Ferritin above the sex-specific upper reference limit requires a systematic diagnostic approach based on transferrin saturation. Elevated ferritin with elevated transferrin saturation (>45%): hereditary haemochromatosis is the primary consideration — HFE gene mutation testing (C282Y/H63D) is indicated; confirm liver function, fasting glucose (diabetes from pancreatic iron deposition), and arrange hepatology referral for liver assessment and phlebotomy scheduling if C282Y homozygosity confirmed. Elevated ferritin with normal transferrin saturation: investigate secondary causes — liver disease (ALT, AST, ALP), inflammatory disease (hs-CRP, ESR, LFTs), haematological malignancy (FBC, LDH, protein electrophoresis), alcohol consumption history, and hyperferritinaemia-cataract syndrome. Extreme ferritin (>500–1000 ng/mL) in an acutely unwell patient with cytopenias and fever: urgent HLH exclusion is required. Moderately elevated ferritin (200–500 ng/mL) in a patient with metabolic syndrome, NAFLD, or chronic inflammatory disease: most commonly reflects inflammatory and hepatic upregulation rather than iron overload — transferrin saturation distinguishes these.

Normal

A ferritin within the sex-specific reference range in a patient without inflammatory disease or liver pathology confirms adequate iron stores at the time of testing and effectively excludes iron deficiency as a primary haematological contributor. In functional medicine assessment of fatigue, hair loss, or cold intolerance, practitioners may identify a 'functional inadequacy' at ferritin values that are technically within the reference range but below the functional optimal — particularly in premenopausal women with ferritin in the 12–50 ng/mL range. In patients with active inflammatory disease or liver pathology, a 'normal' ferritin does not confirm iron adequacy — transferrin saturation below 16–20% in this context identifies functional iron deficiency masked by inflammatory ferritin upregulation.

Reduced

Ferritin below 12 ng/mL confirms absent iron stores and establishes iron deficiency as the aetiological diagnosis requiring repletion regardless of haemoglobin, MCV, or other parameters. Ferritin below 30 ng/mL is highly specific for iron deficiency in both non-inflammatory and inflammatory contexts and warrants iron repletion, particularly in symptomatic patients. Ferritin 30–50 ng/mL in a patient with fatigue, hair loss, restless legs, or other iron-depletion-associated symptoms warrants further iron panel assessment (serum iron, TIBC, transferrin saturation) and hs-CRP to contextualise whether inflammatory masking is possible; many integrative practitioners apply a functional optimal threshold and treat at this level regardless of the mainstream lower limit of normal. The root cause of iron depletion must always be investigated — dietary iron intake, blood loss (gastrointestinal, gynaecological), absorption impairment (coeliac disease, atrophic gastritis, PPI use) — to ensure repletion is combined with source treatment.

Note: The single most clinically impactful caveat is the acute phase reactant behaviour of ferritin — a normal or elevated ferritin in a patient with active systemic inflammation does not confirm adequate iron stores, and iron deficiency can be completely masked in inflamed patients. This caveat is responsible for a significant proportion of missed iron deficiency diagnoses in patients with chronic inflammatory disease, cancer, and CKD, where ferritin is routinely normal or elevated despite functional iron restriction impairing erythropoiesis and tissue function. Transferrin saturation — specifically below 16–20% — identifies iron-restricted erythropoiesis even when ferritin is elevated or normal. The second caveat is the distinction between hereditary haemochromatosis and the many secondary causes of hyperferritinaemia — the majority of patients with elevated ferritin do not have haemochromatosis; transferrin saturation is the critical discriminating parameter, and HFE testing should only follow confirmed elevated transferrin saturation above 45%. The third caveat is the hyperferritinaemia-cataract syndrome — a genetic cause of markedly elevated ferritin with normal transferrin saturation that should be considered before phlebotomy is initiated in any patient with very high ferritin and normal iron studies.

Frequently asked questions

Serum ferritin measures a small glycosylated fraction of the intracellular iron storage protein secreted into the bloodstream in proportion to total body iron stores. It is the most sensitive single iron status marker because it falls below normal before haemoglobin, MCV, serum iron, or transferrin saturation become abnormal — allowing detection of iron store depletion in the pre-anaemic phase when intervention is simplest and most effective. A ferritin below 12–15 ng/mL confirms absent iron stores with high specificity and requires no further iron status confirmation.

How to access the Ferritin test

The Ferritin reference page is free and open to all practitioners. Create a free practitioner account to see pricing, save tests to your list, and generate requisition forms. Verification takes 1–2 business days.

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About this page

Published: May 24, 2026

Last reviewed: May 24, 2026

References:

This content is for licensed healthcare practitioners only and does not constitute medical advice. Clinical decisions should be based on the full clinical picture and not on any single test result.

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