What is the role of lab tests in the diagnosis of scarlet fever?

Updated: Jun 21, 2019
  • Author: Bahman Sotoodian, MD; Chief Editor: William D James, MD  more...
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The diagnosis is mostly based on the clinical presentation. However, leukocytosis with left shift presentation and possibly eosinophilia a few weeks after convalescence on a standard blood test and urine tests are part of a complete medical workup. The following studies are indicated in scarlet fever:

  • Throat or nasal culture or rapid streptococcal test

  • Anti-deoxyribonuclease B, antistreptolysin-O titers (antibodies to streptococcal extracellular products), antihyaluronidase, and antifibrinolysin can be valuable in confirmation of the diagnosis

In most cases, no imaging studies are indicated.

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