Does this test have other names?
Serum ferritin level
What is this test?
This test measures how much iron is in your blood.
Ferritin is a protein that stores iron. Red blood cells need iron to form normally
and carry oxygen around your body. Other parts of your body, such as your liver, bone
marrow, and muscles, also need iron.
Low levels of ferritin lead to iron-deficiency anemia. This means you have too few
red blood cells. Iron deficiency can come from a poor diet or blood loss. Or your
body may have trouble absorbing iron from food. It would take a very poor diet for
a healthy adult to get a nutritional iron deficiency. But a low iron level is the
most common nutritional deficiency in children. Children need extra iron during times
of rapid growth.
In adults, low iron levels usually happen because of long-term (chronic) blood loss.
If you have ulcers or tumors in your gut, intestinal bleeding, or very heavy menstrual
periods, you could lose more iron than you take in and develop an iron deficiency.
This can also happen if you are pregnant or breastfeeding.
High levels of iron can damage your joints, heart, liver, and pancreas. Too much iron
is most often caused by an inherited disease called hemochromatosis. Many people with
this disease never have any symptoms, especially women who lose iron through menstruation.
But men and some women slowly build up excess iron over the years. They may begin
to feel joint and belly pain in their 20s or 30s. Heavy alcohol use increases the
amount of iron that is absorbed.
Iron poisoning happens when a large amount of iron is taken in all at once. This happens
to children who accidentally take too many iron supplements.
Why do I need this test?
You may need this test if your healthcare provider thinks that you have low iron levels.
Pale or yellow skin
Extreme tiredness and dizziness
Heavy menstrual cycles
Bleeding in your digestive tract
Blood in your stool
Shortness of breath or chest pain, especially with activity
Brittle nails or loss of hair
Pounding or "whooshing" sound in your ears
A sudden spinning sensation (vertigo)
Children who eat a lot of ice and toddlers and babies who drink too much whole cow's
milk may also get this test.
You might also have this test done to check your ferritin level after treatment for
What other tests might I have along with this test?
Your healthcare provider may also order other blood tests. These include:
Serum iron level to measure the iron in the liquid part of your blood.
Total iron binding capacity (TIBC) to measure the amount of transferrin in your blood. Transferrin is the protein that
carries ferritin from the gut to the cells that need it.
Hemoglobin and hematocrit to measure the number of your red blood cells.
Complete blood count (CBC) to look at many different qualities of your blood, including the size of cells.
HFE gene test to see if you have hemochromatosis.
Zinc protoporphyrin to measure iron deficiency or levels of lead toxicity.
What do my test results mean?
Test results may vary depending on your age, gender, health history, and other things.
Your test results may be different depending on the lab used. They may not mean you
have a problem. Ask your healthcare provider what your test results mean for you.
Results are given in nanograms per milliliter (ng/mL). The normal range for ferritin
in your blood serum is:
24 to 336 ng/mL for adult males
24 to 307 ng/mL for adult females
25 to 200 ng/mL for newborns
200 to 600 ng/mL at 1 month old
50 to 200 ng/mL at 2 to 5 months old
7 to 140 ng/mL for children 6 months to 15 years
If your results are lower, it may mean that you have iron-deficiency anemia. Lower
levels may also be caused by certain medicines. Antacids can cause absorption problems,
and nonsteroidal anti-inflammatory medicines can cause blood loss in your digestive
If your results are higher, it may mean you have:
You may also have higher levels if you are getting iron-replacement therapy or had
a recent blood transfusion.
How is this test done?
The test is done with a blood sample. A needle is used to draw blood from a vein in
your arm or hand.
Does this test pose any risks?
Having a blood test with a needle carries some risks. These include bleeding, infection,
bruising, and feeling lightheaded. When the needle pricks your arm or hand, you may
feel a slight sting or pain. Afterward, the site may be sore.
What might affect my test results?
Eating foods that are high in iron, including meat, leafy green vegetables, and beans,
or taking iron supplements can affect your results. Drinking a lot of milk, donating
blood frequently, and running long distances regularly can also affect your results.
How do I get ready for this test?
You don't need to prepare for this test. Be sure your healthcare provider knows about
all medicines, herbs, vitamins, and supplements you are taking. This includes medicines
that don't need a prescription and any illegal drugs you may use.