Difference Between Ferritin and Iron? Full Clinical Insights

Ferritin	Iron
A globular protein that stores iron in an inactive form.	An essential mineral needed for oxygen transport and cellular functions.
Stores around 25% of the body’s total iron.	Most of the body’s iron is in haemoglobin.
Mostly found in the liver, spleen, bone marrow, and immune cells.	Primarily located in red blood cells and muscle myoglobin.
Releases stored iron when the body needs it, acting as a reserve.	Supports haemoglobin production, oxygen delivery, and energy metabolism.

How Ferritin and Iron Work Together?

Ferritin and iron work collectively to perform essential functions in the body. Iron is essential for haemoglobin production and energy metabolism, and ferritin helps maintain iron balance by storing excess iron and releasing it when needed. It acts as a backup system, ensuring iron levels remain optimal. Any surplus iron is stored in the liver in the form of ferritin, safeguarding the body from overload.

What are the Normal Ferritin and Iron Levels?

Normal ferritin levels vary by age and gender, and laboratories may use slightly different reference ranges. Below are the standard values commonly followed by most UK laboratories.

Normal Ferritin Levels in UK Adults

Men:

• <15 µg/L - Iron Deficiency
• 15–29 µg/L - Low Iron Stores
• >518 µg/L - High/Raised Level

Women:

• <15 µg/L - Iron Deficiency
• 15–29 µg/L - Low Iron Stores
• >400 µg/L - High/Raised Level

Normal Iron Level in UK Adults

Causes and Symptoms of Low Ferritin

Low ferritin is a key indicator of iron deficiency anaemia and may be caused by poor absorption of iron or chronic bleeding. However, it is possible to have normal iron levels but low ferritin, as the body uses stored iron first before blood levels drop. 

Therefore, reduced ferritin levels often require additional tests, such as the Iron test, TIBC, and Transferrin, to confirm iron deficiency.

Common symptoms include:

• Pale skin
• Constant fatigue
• Dizziness
• Heart palpitations
• Restless Leg Syndrome
• Breathlessness

Do Low Ferritin Levels Make You Anaemic?

Ferritin is an iron-storage protein that reflects the body’s iron levels. Low ferritin itself doesn’t cause anaemia; instead, anaemia develops when iron deficiency becomes significant.

How to Increase Ferritin Levels?

You can usually increase low ferritin levels through simple dietary changes unless advised otherwise by your doctor. Red meat, dark green leafy vegetables, fortified cereals, and pulses are rich sources of iron. Adding them to your routine diet can significantly improve your ferritin levels. Moreover, eating iron-rich foods along with vitamin C can significantly improve your iron absorption.

Causes and Symptoms of High Ferritin

Ferritin levels can rise in response to infection, inflammation, or physical trauma, as ferritin behaves like an acute-phase reactant. Abnormally high levels may also occur with an overactive thyroid, chronic liver or kidney disease, or excessive iron supplementation.

Another common cause is haemochromatosis, a condition in which the body cannot eliminate excess iron effectively, leading to a gradual buildup of iron stores.

Common symptoms include:

• Muscular weakness
• Joint pain
• Abdominal pain
• Unexplained weight loss
• Reduced libido
• Hair loss

How to Reduce Ferritin Levels Safely?

Raised ferritin levels are often caused by infection or inflammation and usually return to normal as your health improves. Mild increases can be managed through dietary changes, such as reducing red meat intake, limiting vitamin C with iron-rich foods, and stopping iron supplements. However, if ferritin levels are significantly elevated, you should consult your doctor for proper guidance.

Causes and Symptoms of Low Iron (Anaemia)

Iron levels in the body usually decrease due to inadequate dietary intake, poor absorption, or blood loss. Common symptoms include:

• Pale skin
• Breathlessness on even mild physical activity
• Persistent Fatigue
• Reduced concentration
• Irregular Heartbeats

If you’re experiencing signs of iron deficiency, book our Iron Blood Test today to check all key iron-related biomarkers and get clear insights into your iron status.

How to Improve Iron Levels?

Improving your iron content in the body depends on several factors, such as how much iron you consume a day, your absorption capacity, and any health condition that causes poor absorption or leakage. 

Haem iron from meat, fish, and poultry is absorbed more efficiently than non-haem iron found in plant foods like leafy greens, cereals, and legumes, making red meat a particularly rich source.

Those relying on non-haem iron should ensure adequate intake and include vitamin C–rich foods to boost iron absorption. 

Causes and Symptoms of High Iron

A raised iron level may be the result of excessive supplementation, chronic liver disease, an infection, or a genetic condition, such as haemochromatosis. Common symptoms of abnormally high iron include:

• Abdominal cramping and discomfort
• Fatigue
• Muscle and Joint Pain

Ferritin vs Iron Blood Tests: Which One Do You Need?

The ferritin test measures your body’s iron stores, while iron blood tests assess the amount of iron circulating in your blood. Both provide valuable insights, but depending on your symptoms, such as fatigue, weakness, or unexplained anaemia, your doctor may recommend one or both tests to get a complete picture of your iron status.

You can book an individual Iron Panel covering both ferritin and iron levels, or choose a broader profile such as our Fatigue Test or Multivitamin Test, which also evaluates these key biomarkers.

When to See a Doctor About Iron or Ferritin Levels

You should see a doctor if your iron or ferritin levels are consistently too low or too high, or if you experience symptoms like fatigue, weakness, or unusual bruising, as these may indicate an underlying health issue.