Iron: About This Test

What is it?

This test measures the amount of iron in your blood. It is done on blood taken from a vein in your arm.

Too little iron can cause anemia, which can cause weakness, tiredness, or lack of stamina.

Too much iron can cause hemochromatosis. This is usually an inherited disease that can cause tiredness, weakness, liver problems, and pain in the joints.

Why is this test done?

A test for iron is done to:

• Check for too much or too little iron in the blood.
• See if your diet is providing enough iron.
• Find out if treatment to keep the right amount of iron in your blood is working.

How do you prepare for the test?

Do not eat or drink (other than water) for 12 hours before the test. You will also need to avoid iron supplements for 12 to 24 hours before your test. Your doctor will give you specific instructions. This test is often done first thing in the morning.

How is the test done?

A health professional uses a needle to take a blood sample, usually from the arm.

What happens after the test?

• You will be able to go home right away.
• You can go back to your usual activities right away.