What Ferritin Actually Is

Ferritin is the protein your body uses to store iron in a safe, non-toxic form. Most of it lives inside cells, but a small amount circulates in blood, and that's what a ferritin test measures. The blood number reflects how much iron is in your storage tank.

Typical reference ranges (these vary slightly between labs):

• Men: roughly 30 to 400 ng/mL
• Women (premenopausal): roughly 15 to 150 ng/mL
• Women (postmenopausal): closer to the male range
• Children: 7 to 140 ng/mL, depending on age

The catch: ferritin is also an "acute phase reactant," which means it goes up when there's inflammation anywhere in the body. A high ferritin doesn't automatically mean you have too much iron.

What Counts as "Elevated"

The threshold most clinicians use is anything above 300 ng/mL in men or 200 ng/mL in women. Mildly elevated values (say, 300 to 500) are common and usually mean something benign: a recent infection, metabolic syndrome, or fatty liver. Numbers above 1000 ng/mL are taken much more seriously and usually trigger further investigation, including testing for hemochromatosis and looking for an inflammatory source.

The single most useful follow-up test is transferrin saturation. If both ferritin and transferrin saturation are high, the likely cause is iron overload. If ferritin is high but transferrin saturation is normal or low, the cause is more likely inflammation, liver disease, or alcohol.

What Drives Ferritin Up

Hereditary hemochromatosis. The most common genetic iron-overload disorder, especially in Canadians of Northern European descent. The HFE gene mutation (C282Y homozygous) causes the gut to absorb too much iron from food. Untreated, it can damage the liver, heart, joints, and pancreas. Treated with regular phlebotomy (blood removal), it's manageable.

Chronic inflammation. Rheumatoid arthritis, lupus, inflammatory bowel disease, chronic infections (including chronic hepatitis B or C, HIV), and any active infection at the time of the test. Ferritin can shoot up overnight from a flu.

Fatty liver disease. Probably the single most common cause of mildly elevated ferritin in adults today. Non-alcoholic fatty liver and metabolic-associated steatotic liver disease both push ferritin into the 300 to 800 range without true iron overload.

Alcohol. Even moderate regular drinking elevates ferritin. Cutting alcohol for a month often drops the number significantly.

Cancer. Some cancers (especially leukemia, lymphoma, and liver cancer) raise ferritin, sometimes dramatically. This is one reason persistently very high ferritin gets worked up carefully.

Iron infusions or transfusions. Recent IV iron or blood transfusions will spike ferritin for weeks.

Obesity and metabolic syndrome. Linked to chronic low-grade inflammation, which raises ferritin without iron overload.

Symptoms

Most people with mildly elevated ferritin feel completely fine. The number gets flagged on routine blood work and that's that. When symptoms do appear, they usually point to advanced iron overload from untreated hemochromatosis. The classic ones:

• Persistent fatigue
• Joint pain, especially in the second and third knuckles of the hand
• Right-upper-abdominal discomfort (the liver)
• A bronze or grey tint to the skin
• Loss of libido or erectile dysfunction
• New diabetes
• Irregular heartbeat or shortness of breath

Any of those, combined with very high ferritin, is a reason to push for hemochromatosis genetic testing.

Why It Matters

Mildly elevated ferritin from fatty liver or metabolic syndrome is the body's flare; the real problem is the underlying inflammation, not the ferritin number itself. Treat the cause (weight loss, alcohol reduction, exercise) and the number tends to follow.

True iron overload is a different story. Excess iron in cells generates free radicals, which over years damage the liver (cirrhosis, hepatocellular cancer), the heart (cardiomyopathy, arrhythmia), and the pancreas (diabetes). The good news: caught early, hemochromatosis is treated by donating blood every few months. People diagnosed before organ damage live a normal lifespan.

The Workup for High Ferritin

When ferritin comes back high, most doctors will order some combination of these next steps:

• Iron studies (serum iron, TIBC, transferrin saturation). The most important follow-up. Transferrin saturation over 45% to 50% points toward iron overload.
• Liver enzymes (ALT, AST, ALP, GGT). Looks for fatty liver, alcohol-related damage, or viral hepatitis.
• CRP. Checks whether inflammation is the explanation.
• HFE genetic test (C282Y, H63D). Ordered when transferrin saturation is high, or family history is suggestive.
• Fasting glucose, HbA1c, lipid panel. Screens for metabolic syndrome, which is the most common driver of mild elevations.
• Liver imaging (ultrasound or MRI). Used to assess fatty liver and, in suspected iron overload, to quantify liver iron content (MRI Ferriscan).
• Hepatitis B and C serology. Especially with elevated liver enzymes.

Rarely needed unless the picture is unusual:

• CBC and LDH (looking for a blood disorder)
• Bone marrow biopsy (for suspected leukemia or lymphoma)
• Liver biopsy (less common now that MRI Ferriscan exists)

Treatment

Treatment depends entirely on what's causing the high number. For most adults with mild elevation and metabolic risk factors, the recommendations are unglamorous but effective: lose weight, cut back on alcohol, move more, eat fewer ultra-processed foods. Numbers often drop 30% to 50% within six months.

For confirmed hereditary hemochromatosis: therapeutic phlebotomy. You essentially donate blood every 1 to 2 weeks until your ferritin is back in normal range, then every few months for maintenance. It's the same procedure as donating at Canadian Blood Services, just more often.

For patients who can't tolerate phlebotomy (such as those with anemia or heart failure), chelation therapy uses oral or IV medication (deferasirox, deferoxamine) to bind iron so it can be excreted.

Cutting iron from your diet alone doesn't fix iron overload. The body absorbs only a small amount each day, and stopping red meat won't undo years of accumulation. Phlebotomy works much faster.

The Short Version

A single high ferritin reading is rarely an emergency. The next step is always context: transferrin saturation, liver enzymes, inflammatory markers, and your overall health picture. Mild elevations are usually about lifestyle and metabolism. Numbers in the thousands warrant a careful workup. If you've had one high result, ask your doctor for the follow-up panel rather than just repeating the ferritin on its own.

FAQ Section

What's a normal ferritin?

Roughly 30 to 400 ng/mL for men, 15 to 150 ng/mL for premenopausal women, with postmenopausal women closer to the male range. Children and pregnancy have different ranges.

Can lifestyle changes lower ferritin?

Yes, often dramatically. Cutting alcohol, losing weight, and addressing fatty liver can drop a number from 600 to 200 within months. This won't help true iron overload, but it's almost always the right first step for mild cases.

What should I do if mine is elevated?

Don't panic from one reading. Ask your doctor to run iron studies (transferrin saturation in particular), liver enzymes, and CRP. The combination tells the real story.

Are home ferritin tests reliable?

Some are reasonably accurate, but a lab draw is still the gold standard and is what your doctor will use to make decisions.

Is high ferritin a sign of cancer?

Usually not. Cancer is well down the list of common causes. Very high ferritin (over 1000) with weight loss, night sweats, or persistent fevers does warrant prompt evaluation.

How often should I retest?

For mild elevations under observation, every 6 to 12 months is typical. For active treatment of hemochromatosis, much more often (sometimes every 2 weeks during initial phlebotomy).

Disclaimer: This blog post is intended for educational purposes only and should not be taken as medical advice. Always consult your healthcare provider for personal health concerns.