Iron
What the test generally measures, and what to ask about it.
Longetic keeps every lab and record you’ve had organized and easy to find, so your own Iron values sit together on one chart and you walk into your next appointment prepared.
What is Iron?
A mineral your body needs to make hemoglobin and carry oxygen in the blood.
What is iron? Iron is a mineral that our bodies need for growth and development. Your body uses iron to make hemoglobin, a protein in red blood cells. Hemoglobin carries oxygen from the lungs to all parts of the body. Iron is also important for healthy muscles, bone marrow, and organ function. Your body also needs iron to make some hormones. How do you get iron? Iron is found naturally in many foods and is added to some fortified food products. Foods that are high in iron include: Lean meat, seafood, and poultry Iron-fortified breakfast cereals and breads White beans, lentils, spinach, kidney beans, and peas Nuts and some dried fruits, such as raisins Iron is available in supplements, either on its own or as part of many multivitamin/mineral supplements.
Tests often checked alongside this
How this can show up in how you look and feel
- Pale skin, especially in the face and inner eyelids, is sometimes associated with low iron
- Brittle nails or nails that curve unusually (spooning) can occur with longstanding low iron
- Hair thinning or increased shedding is sometimes linked to low iron
- Cracked corners of the mouth can be associated with iron deficiency
- Many people with low iron have no visible signs until levels drop quite low
What can affect this marker
- Diet and iron-rich foods
- Blood loss, including periods
- Pregnancy and growth spurts
- Gut absorption and gut health
What to track over time
- Your levels across repeat tests
- Energy and fatigue patterns
- Response to diet or supplements
- Alongside ferritin and blood counts
What to ask your doctor
- Is my iron actually low or borderline?
- Should I supplement or eat more iron?
- What's causing ongoing iron loss?
- When should I retest?
This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Terms of Use.
References
About our sources
Official sources
Government health agencies, national institutes, and intergovernmental bodies whose guidelines carry regulatory or policy weight.
Clinical / professional
Medical societies, specialty colleges, and professional associations whose consensus statements reflect clinical practice standards.
Peer-reviewed research
Original research articles and systematic reviews published in indexed journals and verified through PubMed or DOI.