Laboratory Data

1. Serum electrolytes. Assess, particularly Na+ and bicarbonate, in any child considered significantly dehydrated. Knowing the serum Na+ concentration is crucial when determining composition of the fluids and rate of rehydration to be used in a child who is dehydrated.

2. CBC with differential. Anemia may be associated with IBD, hemolytic uremic syndrome, malabsorption, tumor, or HIV infection.

3. ESR, C-reactive protein. Elevated in IBD and systemic infections.

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