What should you know about dengue NS1?

NS1 is a viral antigen released while dengue virus is present in the bloodstream. A positive result supports current dengue infection. A negative result does not always exclude dengue, particularly when testing happens outside the most useful testing window or the illness is changing. The report should be read alongside the illness history, examination and blood-count monitoring.

Dengue fever may bring fever, headache, muscle aches, joint pain or chills. These symptoms are not specific to dengue, so an NS1 result is one part of the clinical picture. Easy bruising or bleeding needs prompt medical attention rather than reassurance from a single test.

Arrange a GP consultation to review when symptoms began, travel or mosquito exposure, medicines and the exact report wording. Rest, drink fluids as advised, and use only fever relief recommended by a clinician. Avoid aspirin or ibuprofen unless a healthcare professional specifically says they are suitable, because some medicines can increase bleeding risk. Keep follow-up appointments if repeat examination or blood tests are advised.

Seek urgent medical care for severe abdominal pain, repeated vomiting, bleeding from the nose or gums, blood in vomit or stool, marked drowsiness, confusion, breathing difficulty, fainting, or inability to drink. Warning signs can appear as fever settles, so worsening symptoms deserve assessment even if the temperature has improved.

Ask which day of illness the sample represents, whether the result fits your symptoms, whether repeat testing or a blood count is needed, which medicines and fluids are appropriate, and which warning signs should send you to urgent care.