Croup laboratory findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Luke Rusowicz-Orazem, B.S.

Overview

Laboratory findings may include abnormal white blood cell counts as well as markers for inflammation.

Laboratory Findings

• Laboratory tests are rarely useful for diagnosing croup, but the following markers may be present in croup patients.

White Blood Cell Count

• A complete blood count test performed on croup patients may reveal abnormal lymphocyte and other white blood cell counts, lesser or greater than normal.

Markers for Inflammation

• Croup patients may display markers for inflammation, determined by the following tests:
  • Erythrocyte sedimentation rate
  • C-reactive protein