My hemoglobin is normal but ferritin is low — am I iron deficient?

Yes — and this is actually a useful early finding. Ferritin (iron stores) drops first in developing iron deficiency, before hemoglobin starts to fall. So low ferritin with normal hemoglobin indicates 'iron deficiency without anaemia' — an early stage that often responds well to supplementation and prevents progression to anaemia. Many Indian women and adolescents have this pattern, particularly with vegetarian diets and menstrual loss.

My ferritin is high — does that mean I have too much iron?

Not necessarily. Ferritin is also an acute-phase reactant — it rises during inflammation, infection, liver disease, obesity, and many other conditions, independent of iron status. The most common Indian reasons for raised ferritin are non-alcoholic fatty liver disease, chronic infection, recent acute illness, and obesity-related inflammation — not iron overload. Iron overload work-up usually combines ferritin with transferrin saturation (typically >45% in true overload) and the clinical picture.

I take iron tablets — when should ferritin be rechecked?

Ferritin rises more slowly than hemoglobin after starting iron replacement. Most doctors recheck CBC at 4–8 weeks (to confirm hemoglobin is improving) and ferritin at around 3 months (to confirm stores are being rebuilt). The goal of iron treatment is not just normal hemoglobin — it is rebuilt iron stores, indicated by ferritin returning to the middle of the reference range. Stopping iron once hemoglobin normalises but ferritin is still low often leads to recurrence.

I am vegetarian — why is my ferritin so low?

Several reasons combine. Plant-source (non-heme) iron is less efficiently absorbed than animal-source (heme) iron. Common dietary habits — tea or coffee with meals, calcium-rich foods at the same meal — further block iron absorption. Menstrual loss in women adds an ongoing drain. Pregnancy and breastfeeding pull large amounts of iron. The good news is that targeted dietary changes (vitamin C with meals, separating tea/coffee from meals, more pulses and dark leafy greens) plus appropriate supplementation under medical guidance usually corrects ferritin over months.

Do I need to fast for a ferritin test?

Most labs do not strictly require fasting for ferritin alone. However, ferritin is usually drawn alongside the full iron panel (Serum Iron, TIBC, saturation), which is best on a fasting morning sample with iron supplements paused for 24–48 hours. Inflammation in the days before testing — even from a cold or dental work — can raise ferritin and complicate interpretation, so when possible, test when you have been well.

Ferritin Test: Normal Range & Iron Stores

Also seen on reports as: S. Ferritin, Iron Stores, Iron Storage Protein

What is Ferritin?

Ferritin is the protein the body uses to store iron — mainly in the liver, spleen, bone marrow, and to some extent in every cell. A small portion of stored ferritin spills into the blood, and the amount in the blood reflects the size of the body's iron stores. So serum ferritin is the most useful single test of iron stores.

Ferritin is also an 'acute-phase reactant' — its level rises during any inflammation, infection, liver injury, or significant illness, independent of iron status. This is the central complication of ferritin interpretation. A normal-looking ferritin in someone with chronic inflammation can mask underlying iron deficiency; a high ferritin during acute illness does not necessarily mean iron overload.

The test is run on a small blood sample drawn from a vein. NABL-accredited Indian labs typically report ferritin in nanograms per millilitre (ng/mL) or micrograms per litre (µg/L) — the numbers are equivalent.

Why doctors order it

Ferritin is most commonly ordered to confirm iron-deficiency anaemia. Low ferritin is the most reliable single marker of true iron deficiency — it falls before hemoglobin does, so low ferritin can identify iron deficiency before it has caused anaemia. It is part of routine work-up for tiredness, recurrent infections, restless legs, hair loss, and women with heavy menstrual bleeding.

It is also used in pregnancy and pre-conception evaluation, in vegetarian and vegan adults, in patients before starting or during iron supplementation, in children with growth concerns or poor dietary intake, and in unexplained microcytic anaemia. Ferritin is part of the Anaemia Mukt Bharat strategy's screening recommendations in some settings.

At the other end, ferritin is used to investigate possible iron overload — hereditary haemochromatosis, repeated blood transfusions (thalassaemia major, sickle cell), or chronic alcohol-related liver disease. Very high ferritin (well above the reference range), particularly with high transferrin saturation, raises the question of iron overload.

What the result means

Low ferritin (below the lab's lower limit, often <12–15 ng/mL) confirms true iron deficiency — almost diagnostically specific, because no other condition lowers ferritin. This is the single most useful number in iron deficiency work-up. Some Indian and international guidelines treat ferritin <30 ng/mL as 'iron deficient' in symptomatic adults, particularly women of reproductive age — recognising that early deficiency can show low ferritin even before levels drop below the formal cut-off.

Normal or high ferritin does NOT rule out iron deficiency in the presence of inflammation. Because ferritin rises in chronic infection, autoimmune conditions, chronic kidney disease, liver disease, and obesity, a 'normal' ferritin of 50–100 in someone with chronic inflammation can hide iron deficiency. In these situations, doctors use cut-offs that are different from the lab's reference range — for example, in chronic kidney disease, ferritin under 100 ng/mL is often considered iron deficient.

Very high ferritin (well above the reference range — often >300 ng/mL in men or >200 in women, particularly if >1,000) raises concern about iron overload, severe inflammation, certain liver conditions, or specific blood disorders. Hereditary haemochromatosis is relatively uncommon in Indian populations but exists; transfusion-related iron overload is more common, particularly in thalassaemia. High ferritin always needs context — recent illness, alcohol use, or supplementation can all push it up.

Reference range

Values in ng/mL (equivalent to µg/L). Reference ranges vary by lab and sex.

Adult men — typical range: Roughly 12 – 300 ng/mL
Adult women — typical range: Roughly 12 – 150 ng/mL (varies by life stage)
Iron-deficient (strict): Below 12–15 ng/mL — almost diagnostic of iron deficiency
Iron-deficient (functional / clinical): Below 30 ng/mL in symptomatic adults often treated as iron-deficient
In chronic kidney disease or chronic inflammation: Below 100 ng/mL often considered iron-deficient (the lab's lower limit is misleading)
High ferritin: Above the upper limit — check for inflammation, liver, or iron-overload causes
Very high (>1,000 ng/mL): Less common; usually severe inflammation, iron overload, or specific conditions

Ferritin is an acute-phase reactant — it rises during inflammation, infection, liver injury, or any significant illness, independent of iron status. In chronic conditions, the lab's reference range can be misleading and stricter (higher) cut-offs are used to identify functional iron deficiency.

Common factors that affect the result

Inflammation in any form raises ferritin — acute infections, chronic infections (untreated TB), autoimmune diseases, chronic kidney disease, liver disease, obesity (a low-grade inflammatory state), and many cancers. Recent intense exercise can also push ferritin up. This is why ferritin is best interpreted alongside the rest of the clinical picture and CRP or ESR when inflammation is suspected.

Liver disease raises ferritin substantially — hepatitis B and C, alcoholic liver disease, non-alcoholic fatty liver disease (very common in urban Indian adults), and various other liver conditions all release ferritin from damaged liver cells. A raised ferritin in someone with abnormal liver enzymes is often from this rather than from iron overload.

Iron supplementation can raise ferritin meaningfully over weeks to months — sometimes used to monitor response to iron treatment. Recent blood transfusion also raises ferritin. Conversely, repeated heavy menstrual bleeding, frequent blood donation, chronic gut bleeding, malabsorption, and poor dietary iron intake (particularly in vegetarian Indian diets) all lower ferritin over time.

When to talk to your doctor

Your ferritin is below the lab's lower limit (often <12–15 ng/mL), with or without anaemia — this confirms true iron deficiency and the cause should be investigated.
Your ferritin is in the 15–30 ng/mL range and you have symptoms suggestive of iron deficiency — tiredness, hair loss, restless legs, frequent infections — supplementation is often considered, particularly in women of reproductive age.
Your ferritin is 'normal' but you have chronic inflammation (untreated TB, chronic kidney disease, untreated autoimmune disease, obesity) and anaemia — functional iron deficiency may be present and stricter cut-offs apply.
Your ferritin is well above the reference range (particularly >500–1,000 ng/mL) — this warrants investigation for liver disease, inflammation, iron overload, or other underlying causes.
You are on long-term blood transfusions (thalassaemia major, sickle cell disease) and ferritin is being tracked for iron overload — iron chelation may be needed.

Related tests

Minerals

Iron Studies

Ferritin