Serum iron test: Procedure, results, and normal ranges

If a doctor suspects that a person does not have a healthy amount of iron in their blood, they may order a serum iron test.

In this article, learn more about the uses of a serum iron test. We also explain the normal ranges of iron in the blood and the treatment options for people whose iron levels are too high or too low.

What is a serum iron test?

A serum iron test provides a way for doctors to determine how much iron is in a person’s blood.

The test uses serum, which is the liquid that remains after a doctor removes the clotting elements and blood cells from a blood sample.

The primary purpose of the test is to check whether a person has abnormally high or low levels of iron in their blood, both of which can cause serious health complications.

The results of a serum iron test can help with the diagnosis and treatment of any symptoms that the individual is experiencing. They will typically undergo other types of iron-related serum tests at the same time.

Iron levels that are too high or too low may indicate several different health issues.

Low levels could indicate that a person is not consuming enough iron in their diet or that their body is not processing iron correctly.

For women, heavy menstrual cycles may also contribute to lower iron levels.

Other possible causes of low iron levels include:

  • blood loss in the gastrointestinal tract
  • blood loss from elsewhere in the body
  • pregnancy

When iron counts are too high, it could indicate that a person is consuming too much iron. High iron levels can also occur if a person has a disease called hereditary hemochromatosis.

Additional causes of high iron counts include:

  • chronic liver disease, including liver cirrhosis, liver failure, and hepatitis
  • iron poisoning, from taking too many iron supplements
  • hemolytic anemia, where the abnormal breakdown of red blood cells depletes their numbers
  • multiple packed red blood cell (PRBC) transfusions

How to correct iron levels

Following serum iron and other iron-related tests, a doctor will suggest ways in which a person can correct their iron levels.

People with low levels of iron may need to make changes to their diet or take iron supplements.

They may need to eat more iron-rich foods, which include:

  • molasses
  • beef liver
  • red meat
  • dark green, leafy vegetables
  • whole grains
  • beans

Conversely, those with an elevated iron level should avoid iron in their diet. They may also need to avoid vitamin C supplements, although this is unnecessary in most cases.

If a person has a high iron level as a result of chronic liver disease, they should avoid anything that could hurt the liver more, such as consuming alcohol.

A person with too much iron may also need to undergo a process called phlebotomy, which removes blood from the body.

A doctor will need to run more tests to determine the cause of the iron overload. This will allow them to treat the underlying condition effectively to reduce iron levels.


If a person is experiencing symptoms that indicate too much or too little iron in the blood, a serum iron test can help diagnose the underlying problem.

The serum iron test is a safe and straightforward way to test the level of iron in the blood. While normal ranges can vary between people, a high or low result can help a doctor determine the appropriate treatment.

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