What to expect from a blood test for dengue fever

The test selected can depend on how long symptoms have been present. Early testing may look for parts of the virus, while later testing may look for antibodies made by the immune system. A blood count can also monitor platelets, white cells, and signs of dehydration or bleeding. A single result may not settle the diagnosis, so a clinician may use symptoms, travel or mosquito exposure, examination, and repeat testing.

Tell the clinician when fever began, where you have travelled, and about medicines, especially products containing aspirin or ibuprofen. Do not self-treat with these medicines unless a clinician advises it. The sample is collected from a vein; drink fluids as advised and rest while feverish. Follow the plan for reviewing results because illness can change over time.

Get urgent medical help for severe abdominal pain, repeated vomiting, bleeding from the nose or gums, blood in vomit or stools, extreme sleepiness, restlessness, breathing difficulty, or fainting. Warning signs can appear as fever settles, so seek help even if the temperature has improved. Children, pregnant people, older adults, and people with long-term conditions may need early assessment.

Which dengue test fits the day of illness? Do I need a repeat blood count or sample? Which pain or fever medicines are suitable for me? What symptoms mean I should return urgently?