About Dr. Manisha Panchal Dr. Panchal brings an integrative, whole-child perspective to pediatrics at Private Medical Silicon Valley. She completed her pediatric residency at Stanford’s Lucile Packard Children’s Hospital and serves on the faculty in Newborn Medicine at Stanford’s Children’s Hospital. She also completed an Integrative Medicine Fellowship through the University of Arizona’s Andrew Weil Center for Integrative Medicine. Dr. Panchal believes in caring for the whole child, considering physical health alongside emotional well-being, development, nutrition, sleep, movement, and the everyday habits that shape lifelong health. Her approach emphasizes prevention, building healthy foundations, and helping children and families feel confident and supported throughout every stage of childhood. |
Iron deficiency is often thought of as synonymous with anemia. Clinically, however, they are not the same.
Anemia is a later manifestation of iron deficiency, appearing only after the body’s iron reserves have already been depleted. Before hemoglobin falls below the normal range, low iron stores may already be affecting a child’s energy, concentration, sleep, physical stamina and neurologic development.
New guidance from the American Academy of Pediatrics recognizes this distinction and recommends a broader, more proactive approach to iron screening from infancy through adolescence.
Why Iron Matters to the Developing Body
Iron is essential for producing hemoglobin, the protein that carries oxygen through the blood. But its role extends much further. Iron also contributes to energy metabolism, neurologic function and healthy brain development, supporting processes such as myelination and the production of neurotransmitters.
This is particularly important during periods of rapid growth, when the body’s demand for iron increases. Infants, young children and adolescents may all be vulnerable, but for different reasons.
In younger children, iron deficiency may be associated with irritability, fatigue, developmental concerns or changes in attention. Iron deficiency in infancy and early childhood, even without frank anemia, has been linked to negative effects on brain development that may persist into later childhood and adulthood. In adolescents, it can present as declining energy, headaches, dizziness, reduced athletic performance or difficulty concentrating at school. In this older age group, iron treatment has been associated with improvements in attention, concentration and verbal learning. Some children develop pica, an urge to chew or consume nonfood items such as ice, paper, dirt or cardboard.
These symptoms are not specific to iron deficiency, which is precisely why thoughtful screening and clinical context matter.
Why Hemoglobin Alone May Miss the Problem
A hemoglobin test can identify anemia, but it may not detect the earlier depletion of iron stores.
The updated guidance recommends screening with two tests: a complete blood count, or CBC, and a serum ferritin level. The CBC evaluates hemoglobin and characteristics of the red blood cells, while ferritin provides an indirect measure of the iron the body has in reserve. Performing both tests allows a physician to identify not only anemia but also iron deficiency before anemia has developed.
Together, they provide a more complete picture. A child may have a normal hemoglobin level but a low ferritin level, indicating iron deficiency before anemia has developed. Under the current guidance, a ferritin level at or below 20 ng/mL indicates iron deficiency in young and school-aged children, and a level at or below 30 ng/mL indicates iron deficiency in adolescents and anyone who is menstruating.
Ferritin must still be interpreted in context. Because it can rise during illness or inflammation, a result that appears normal may occasionally mask low iron stores. Laboratory values should never be considered in isolation from a child’s symptoms, medical history and overall health.
Screening at the Right Time
The new recommendations tailor infant screening to feeding history, reflecting when iron deficiency is most likely to emerge.
Infants who primarily receive breast milk should be screened between 9 and 12 months. Those primarily fed iron-fortified formula should be screened between 15 and 18 months, after many have transitioned to cow’s milk or plant-based alternatives, which contain substantially less iron. Because breast milk is low in iron, the guidance also recommends that infants who are primarily breastfed begin an iron supplement by about 4 months of age, continuing until they are eating enough iron-rich foods. Children with ongoing risk factors, such as heavy milk intake or limited iron in the diet, may need to be rescreened at later well-child visits through early childhood.
The guidance also extends universal screening into adolescence. Menstruating adolescents should receive laboratory screening once they are at least one year beyond their first period, and no later than age 14. Continued screening may be appropriate when symptoms or risk factors are present.
This is a meaningful change. Female adolescents have the highest rate of iron deficiency of any group of children, and menstrual blood loss, especially when periods are heavy or prolonged, can gradually deplete iron stores. Because fatigue and concentration difficulties are easily attributed to school, sports, stress or insufficient sleep, iron deficiency may otherwise go unrecognized.
Finding the Reason, Not Just the Deficiency
When low iron is identified, the next question is why.
Diet may be part of the explanation, particularly for children who consume little iron-rich food, follow a vegetarian or vegan diet without sufficient planning, or drink large quantities of cow’s milk or low-iron milk alternatives. Excessive cow’s milk intake is one of the most common causes in young children, both because it displaces iron-rich foods and because it can irritate the intestinal lining.. For this reason, milk (cow’s milk or plant-based alternatives) is generally limited to less than 24 ounces per day after the first year. Rapid growth can raise iron needs, while heavy menstrual bleeding, gastrointestinal blood loss, inflammatory conditions or problems with nutrient absorption may also contribute.
Treatment should therefore extend beyond simply prescribing a supplement. The dose, duration and form of iron should be individualized, and follow-up testing is important to confirm that iron stores are recovering. If they are not, the underlying diagnosis may need to be reconsidered.
Parents should not begin high-dose iron supplementation without speaking with their child’s physician. Too much iron can be harmful, and symptoms attributed to low iron may have another cause.
A More Proactive View of Pediatric Health
For physicians, the larger message is not simply to order another laboratory test. It is to recognize that the absence of anemia does not necessarily mean a child is iron sufficient.
Screening earlier, and interpreting the findings in the context of nutrition, growth, menstrual health, gastrointestinal symptoms, sleep, activity and development, can help us intervene before a correctable deficiency becomes a larger problem.
That is the value of proactive pediatric care: not waiting for a condition to become advanced enough to announce itself, but looking carefully for the quieter signals that appear first.
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