- Abdominal radiograph for leaded foreign bodies or flecks in the GI tract
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- Free erythrocyte protoporphyrin (if not already obtained)
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- Serum aspartate aminotransferase and alanine aminotransferase
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- Neuroimaging (eg, computed tomography of the brain) in patients with encephalopathy
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- Screening for G6PD deficiency (eg, fluorescent spot test or methemoglobin reduction test)*
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