Scarlet fever laboratory tests

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Diagnosis of scarlet fever is clinical. The blood tests shows marked leukocytosis with neutrophilia and conservated or increased eosinophils, high ESR and CRP , and elevation of antistreptolysin O titer. Blood culture is rarely positive, but the streptococci can usually be demonstrated in throat culture.

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