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