Dengue NS 1 Antigen Test
Booked 232 timesAlso known as:
Dengue ELISA, Rapid Dengue Test
Blood
No
Serum
Description
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Overview
Dengue fever, a viral infection by nature, is transmitted to individuals through mosquito bites. In most cases, these mosquitoes belong to tropical or subtropical regions responsible for carrying the virus. That is why it is exceedingly rampant in the regions of Africa, the Caribbean Western Pacific, America and the Eastern Mediterranean.
The dengue NS1 antigen test diagnoses dengue infection in the first few days itself. It is responsible for measuring the antibodies that are produced in response to dengue. This test allows for rapid detection, making it an extremely viable alternative to other dengue tests.
The dengue NS1 antigen test can be prescribed to individuals showing symptoms and signs of dengue fever. Some of the symptoms include - Fever, Retro-orbital pain, Transient macular rash, and Severe headache.
Many individuals affected by the virus develop only mild symptoms. In some cases, affected individuals don’t show any symptoms.
All the signs of the dengue virus only start showing after 4-7 days of being affected by an Aedes aegypti and albopictus mosquito. A dengue NS1 antigen test can also be prescribed if an individual is vomiting continuously or has swollen glands.
When it comes to India, dengue is endemic in almost all regions. The DV-2 serotype is the most common dengue serotype in the country. Frequent dengue outbreaks in the country severely drain the country’s economy and put stress on healthcare professionals.
South states like Karnataka, Kerala and Tamil are some of the country's worst dengue-affected states. Apart from these, Rajasthan and Gujarat also witness high dengue spread every year.
Other names of Dengue NS1 Antigen test
Rapid Dengue Test
What does the dengue NS1 antigen test detect/ measure and who is it prescribed for?
The results of the dengue NS1 antigen test detect the level of nonstructural protein NS1 in an individual’s body. During dengue infection, this is the protein that gets secreted in the blood. The test gets prescribed to patients suspected of acute dengue fever. Here are some of the symptoms of the dengue virus:
- High fever (104 F or more)
- Flu-like symptoms
- Headache
- Eye-pain
- Blood in vomiting
- Continuous vomiting
- Nausea
- Belly pain
- Muscle and joint pain
- Swollen glands
- Skin rash
Dengue hemorrhagic fever (DHF) causes more severe symptoms and can be life-threatening. As followings:
- Severe Abdominal pain
- Vomiting that doesn't go away
- Bleeding gums
- Nose bleeds
- Bleeding under the skin, which may look like bruises
- Blood in urine and/or stools
- Difficulty in breathing
- Cold, clammy skin
- Restlessness
Doctors recommend the dengue NS1 antigen test within the first five days of the onset of dengue virus symptoms. After the results, the doctor can prescribe another dengue NS1 antigen test after 15 days.
The dengue NS1 antigen test applies to women and men of all ages.
Test Result Interpretation
The main component of the dengue NS1 antigen test is the NS1 antigen. The test determines the level of NS1 antigen in the individual’s body. So, a higher NS1 antigen indicated acute dengue fever. The range above 1.1 NS1 antigens is considered high.
However, this doesn’t confirm dengue infection. To corroborate the dengue virus, an individual must take dengue IgG and IgM tests after 6-7 days on the onset of a fever.
If the results show a range of 0.9-1.1, then the result is an equivocal one. The person will need to repeat the test after a week. On the other hand, if the results showcase a range below 0.9, then there is no detectable dengue NS1 antigen.
However, it doesn’t exactly rule out the dengue virus or infection. Another sample should be tested for IgM & IgG serology in 8-14 days.
Sample Type
The results of a dengue NS1 antigen test are based on the analysis of a blood sample.
Test Preparation
The dengue NS1 antigen test is a blood test that doesn’t require much preparation. It is an easy test that involves procuring a blood sample through one of the arm’s veins. The overall procedure of a dengue antigen test lasts for 4-5 minutes.
Test inclusions: What parameters are included?
The marker of dengue infection/fever is NS1 antigen. A dengue NS1 antigen test is evaluated for the presence or absence of antigens in the blood. The NS1 antigen is a toxin and protein produced by the dengue virus. This toxin is present in the blood of an infected person. That is why it helps in the early detection of dengue infection.
How frequently should you take this test?
A random dengue NS1 antigen test helps diagnose dengue virus, flavivirus and high fever. If the result of your dengue NS1 antigen test comes positive, then your doctor may put you on medication or ask for more tests. Getting a negative report doesn’t completely rule out the possibility of the dengue virus. You’ll have to wait for 15 days to get another dengue NS1 antigen test done.
Risk Assessment
Dengue virus, High Fever, Flaviviruses
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Frequently Asked Questions
What is the difference between NS1 and IgM?
While both these dengue tests measure the antibodies or dengue virus produced due to dengue infection, dengue NS1 isn’t the same as dengue IgM. The dengue NS1 antigen test gets recommended by the doctor in the first five days of fever or other symptoms. On the other hand, dengue IgM tests get prescribed after 7-10 days of continuous and severe fever. The dengue NS1 is a blood test for rapid results, making it ideal for early diagnosis of the dengue virus.
How do you treat an NS1 antigen test?
When it comes to treatment, the key focus is ensuring that the patient gets adequate hydration. To manage the fever, most doctors recommend the use of paracetamol or cold water fomentation. In addition, individuals who test positive in the dengue NS1 antigen test must get adequate rest and hydration.
How accurate is the dengue test?
The dengue NS1 antigen test’s accuracy is considered to be high with a specificity of around 98% and sensitivity between 55-82%.
What happens if the dengue test is positive?
A positive dengue test usually means the individual has been affected by the dengue virus. It’s ideal to talk to a doctor to get the best treatment. If, in addition to having dengue, an individual also has the symptoms of hemorrhagic fever, then hospitalisation may be required.
How soon can dengue be detected?
When it comes to dengue, the NS1 antigen test acts as a rapid test. It facilitates the early confirmation of dengue infections. A dengue NS1 antigen test can detect dengue up to 5 days after the onset of symptoms.
How much platelet count is normal in dengue?
Platelets are a vital component of blood. They are important in blood coagulation ( stop bleeding). The ideal platelet count of a healthy person is between 1,50,000-4,50,000 per microlitre of blood. However, in dengue, the platelet count can fall below 1,50,000 per microlitre of blood. But if a dengue patient has a platelet count of over 1,00,000, then there is no risk. A range of 40,000-1,00,000 is considered low risk. However, if the platelet count falls below 40,000, then it is a risk patient.
