Iron Deficiency Testing: Iron, Ferritin, and Anemia
Iron deficiency is a common cause of anemia and can occur before anemia develops, which is why iron stores are often checked early. Tests include serum iron, ferritin, transferrin saturation, and a complete blood count. Ferritin reflects stored iron and is often the first marker to fall. Causes include low intake, blood loss, and absorption problems, and results are interpreted together because inflammation can affect ferritin. Identifying the cause matters as much as confirming the deficiency.
Key Takeaways
- Iron deficiency is a common cause of anemia and can occur before anemia develops.
- Tests include serum iron, ferritin, transferrin saturation, and complete blood count.
- Ferritin reflects stored iron and is often the first marker to fall.
- Causes include low intake, blood loss, and absorption problems.
- Results are interpreted together, because inflammation can affect ferritin.
Frequently Asked Questions
What is the best test for iron deficiency?
Ferritin is often the most useful single marker, but it is interpreted with other iron studies and a complete blood count.
Do I need to fast for iron tests?
Fasting is often recommended for accurate serum iron and transferrin results. Follow the preparation notes on your order.
Can I order iron tests without a doctor?
Yes, iron panels are available through direct-access testing.
Can iron deficiency occur without anemia?
Yes. Iron stores can be depleted before hemoglobin drops, which is why ferritin is checked.
Sources
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