What are the criteria for dengue hemorrhagic fever?

• Fever lasting 2-7 days
  • May be biphasic

• Hemorrhagic tendencies
  • Positive tourniquet (aka Rumpel-Leede) test
  • Petechiae, ecchymosis or purpura
  • GI bleeding

• Thrombocytopenia (<100,000/mm³)

• Evidence of plasma leakage
  • Increase in hematocrit >20% above age/sex normal
  • Decrease in hematocrit >20% after volume replacement
  • Signs of plasma leakage
    • e.g. pleural effusions, ascites, hypoproteinemia

References

http://www.cdc.gov/dengue/clinicalLab/caseDef.html