Accurately diagnosing iron deficiency in children requires knowing which tests to order and how to interpret them in a growing child. Not all doctors automatically test for iron deficiency at routine visits, meaning parents need to know when to ask.
The Basic Blood Panel
A complete blood count (CBC) is the standard starting point. It measures: – Hemoglobin, the oxygen-carrying protein. Anemia is defined as hemoglobin below normal for age. – Mean corpuscular volume (MCV), small, pale red blood cells indicate iron deficiency – Red cell distribution width (RDW), elevated in iron deficiency
Why the CBC Is Not Enough
A normal CBC does not rule out iron deficiency. A child can have significantly depleted iron stores without yet showing anemia, a stage called iron deficiency without anemia. This stage can still impair cognitive function and energy.
The most sensitive test for iron stores is serum ferritin, a protein that stores iron. Low ferritin is the earliest and most specific marker of depletion. However, ferritin rises during infection or inflammation, so it should always be interpreted alongside a C-reactive protein (CRP) level.
Other useful tests: – Serum iron, iron in circulation – Total iron-binding capacity (TIBC), elevated in iron deficiency – Transferrin saturation, low in iron deficiency
Recommended Screening Schedule
The American Academy of Pediatrics recommends universal hemoglobin screening at 12 months, with risk assessment at 4, 15, 18, and 24 months.
After Diagnosis
Confirmed iron deficiency is treated with ferrous sulfate at 3–6 mg/kg/day of elemental iron. Response is typically seen within 4 weeks. Identifying the underlying cause, dietary inadequacy, excessive milk intake, or poor absorption, is equally important.
Contact NuLine to learn about our pediatric iron studies.