A child is diagnosed with atopic dermatitis. Which laboratory test would the nurse expect the child to undergo to provide additional evidence for this condition?

A. Atopic dermatitis is associated with allergic sensitization and an overactive immune response. Children with this condition often have elevated IgE levels, which provides supportive evidence of an atopic or allergic etiology. Measuring IgE can also help identify specific allergens that may trigger or worsen symptoms. B. This test is used to detect fungal infections, such as ringworm or yeast infections. While fungal infections can complicate or mimic dermatitis, a KOH prep does not diagnose atopic dermatitis. C. A wound culture identifies bacterial infections, such as Staphylococcus aureus, which can occur as a secondary complication in atopic dermatitis. However, it does not confirm the underlying condition itself. D. ESR measures nonspecific systemic inflammation and can be elevated in many conditions, but it is not specific enough to be used as diagnostic evidence for atopic dermatitis.