Why Is Iron Important? Iron and Anemia for the NCLEX
Nurseclex Editorial Team · Updated · 7 min read · Written around the NCSBN test plan
Short answer
Iron is essential because the body uses it to make hemoglobin, the protein in red blood cells that carries oxygen. Too little iron causes iron-deficiency anemia: fatigue, pallor, shortness of breath and a fast heart rate. On the NCLEX, expect questions on recognizing anemia and teaching clients about iron supplements and iron-rich foods.
Key takeaways
- Iron is needed to make hemoglobin, which carries oxygen.
- Iron-deficiency anemia causes fatigue, pallor and tachycardia.
- Vitamin C improves iron absorption. Calcium and antacids reduce it.
- Oral iron can cause dark stools and constipation.
- Liquid iron can stain teeth. Use a straw and rinse the mouth.
What iron does
Iron is a key component of hemoglobin, which binds oxygen in the lungs and releases it to the tissues. It is also found in myoglobin in muscle.
Without enough iron, the body makes fewer and smaller red blood cells, which reduces oxygen delivery.
That is why iron questions connect to oxygenation, activity tolerance and safety.
Iron-deficiency anemia
Common causes include blood loss, poor intake, pregnancy and poor absorption.
Signs include fatigue, pallor, shortness of breath on exertion, a fast heart rate, brittle nails and, in some cases, pica.
Labs may show low hemoglobin, low hematocrit and low ferritin.
Teaching about iron supplements
Oral iron is best absorbed on an empty stomach but may be taken with food if it upsets the stomach. Vitamin C, such as orange juice, improves absorption.
Avoid taking iron with milk, antacids or calcium, which reduce absorption.
Warn clients that stools may turn dark, and that constipation is common. Liquid iron should be taken through a straw to avoid staining the teeth.
- Take with vitamin C
- Avoid milk, antacids and calcium at the same time
- Expect dark stools
- Increase fluid and fiber for constipation
Iron-rich foods
Good sources include red meat, poultry, fish, beans, lentils, dark leafy greens and iron-fortified cereals.
Iron from animal sources is generally absorbed more easily than iron from plants.
Pair plant sources with vitamin C to improve absorption.
Practice questions
1. Why is iron important?
Answer and rationale
Correct: B. Iron is essential for hemoglobin and oxygen transport.
2. Which drink should the nurse suggest taking with an iron supplement?
Answer and rationale
Correct: B. Vitamin C improves iron absorption. Milk, tea and antacids reduce it.
3. A client taking oral iron reports black stools. What is the nurse's best response?
Answer and rationale
Correct: B. Dark stools are an expected effect of iron. The nurse still assesses for signs of bleeding if other symptoms are present.
Frequently asked questions
Why is iron important for the body?
It is needed to make hemoglobin, which carries oxygen to the tissues.
What are signs of iron deficiency?
Fatigue, pallor, shortness of breath and a fast heart rate.
What should not be taken with iron?
Milk, calcium and antacids at the same time, because they reduce absorption.
Does iron change stool color?
Yes. Dark or black stools are expected with oral iron.
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