How is a tourniquet test performed in the evaluation of dengue?

Updated: May 03, 2019
  • Author: Darvin Scott Smith, MD, MSc, DTM&H; Chief Editor: Michael Stuart Bronze, MD  more...
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A tourniquet test is often positive. This test is performed by inflating a blood pressure cuff on the upper arm to midway between diastolic and systolic blood pressures for 5 minutes. The results are considered to be positive if more than 20 petechiae per square inch are observed on the skin in the area that was under pressure. Other hemorrhagic manifestations include nasal or gingival bleeding, melena, hematemesis, and menorrhagia.

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