Dengue NS1, IgM and IgG: What Each Positive Means by Fever Day (Video)

2:08 min

Read the full written guide: Dengue NS1, IgM and IgG: What Each Positive Means by Fever Day →

Learn how to read dengue rapid test strips and why timing matters more than the word "positive". We break down NS1, IgM and IgG, show you the critical fever window, and highlight the warning signs you must watch for. This quick guide gives practical steps you can use today, but remember it’s not a substitute for professional medical care. If symptoms worsen, see a doctor immediately.

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Transcript

Did you know dengue NS1 shows up only in the first five days?

Did you know dengue NS1 shows up only in the first five days?

Dengue Test Basics

We'll decode dengue test results and tell you the crucial sign to catch before the fever fades.

What the test lines mean

Think of NS1 as the virus jacket left in your hallway, IgM as the first alarm that rings a few days in, and IgG as the lock you put on the door for years. Each line tells a different story, and the day of fever decides which story matters.

Reading common combos

When you see just NS1 lighting up, it’s likely the first few days of a fresh infection. If IgM shows up, the virus is recent. IgG alone usually means you’ve had dengue before, maybe years ago. Both IgM and IgG together can hint at a second dengue episode.

When to test

Mark the first fever day as day one. In the first five days, ask the doctor for an NS1 test; after day five, IgM and IgG become more reliable. From day three to seven, a complete blood count is usually checked every 24 hours, even if you feel better.

Critical fever window

The most dangerous period is when the fever starts to fall, usually between day three and seven. Watch closely during these days for any warning signs.

The day the fever breaks is not the day to stop watching.

The one warning to watch

If any of these appear, persistent belly pain, repeated vomiting, bleeding from gums or nose, black stools, heavy periods, sudden sleepiness, restlessness, confusion, breathlessness, or no urine for six hours, head to the hospital right away. These WHO warning signs matter more than any test line.

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Read the full guide

The full guide is on thecareonline.com. General information only, so check with your doctor for your own case.

Nothing on The Care Online is medical advice. Traditional practices are described as tradition, not as fact. Take a persistent or serious concern to a qualified professional. See how videos and posts are made on our methodology page.