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How do you assess a patient with dengue?

Author

Michael Henderson

Updated on March 04, 2026

How do you assess a patient with dengue?

If an infection is suspected, you will get a blood test to check for the dengue virus. During a blood test, a health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial.

Likewise, people ask, how do you assess for dengue?

If an infection is suspected, you will get a blood test to check for the dengue virus. During a blood test, a health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial.

Similarly, what is the confirmatory test for dengue? For patients presenting during the first week after fever onset, diagnostic testing should include a test for dengue virus (rRT-PCR or NS1) and IgM. For patients presenting >1 week after fever onset, IgM detection is most useful, although NS1 has been reported positive up to 12 days after fever onset (Figure 3-01).

Considering this, what should you do if you suspect someone has dengue?

Immediately go to a local clinic or emergency room if you or a family member has any of the following symptoms.

  1. Belly pain, tenderness.
  2. Vomiting (at least 3 times in 24 hours)
  3. Bleeding from the nose or gums.
  4. Vomiting blood, or blood in the stool.
  5. Feeling tired, restless, or irritable.

How is dengue fever detected in the laboratory?

The diagnosis of dengue fever is usually confirmed in the laboratory by serologic tests on blood samples from the patient. (In very technical terms, this is done by antigen-detection ELISA or PR-PCR during the acute phase of the disease or by IgM ELISA or paired serology during the recovery phase of dengue fever).

How soon can dengue be detected?

Molecular tests for dengue virus (PCR)—detect the presence of the virus itself; these tests can diagnose dengue fever up to 7 days after the onset of symptoms and can be used to determine which of the 4 different serotypes of dengue virus is causing the infection.

What are the warning signs of dengue?

Warning Signs*
  • Abdominal pain or tenderness.
  • Persistent vomiting.
  • Clinical fluid accumulation.
  • Mucosal bleed.
  • Lethargy or restlessness.
  • Liver enlargement > 2 cm.
  • Laboratory finding of increasing HCT concurrent with rapid decrease in platelet count.

Can I get dengue without fever?

An overwhelming 75 – 90% of patients acquire dengue fever without any symptoms, not even fever.

What happens if dengue ns1 is positive?

A positive NS1 test result confirms dengue virus infection without providing serotype information. A negative NS1 test result does not rule out infection. People with negative NS1 results should be tested for the presence of dengue IgM antibodies to determine possible recent dengue exposure.

How do you test for Hess dengue?

To perform the test, pressure is applied to the forearm with a blood pressure cuff inflated to between systolic and diastolic blood pressure for 10 minutes. After removing the cuff, the number of petechiae in a 5 cm diameter circle of the area under pressure is counted. Normally less than 15 petechiae are seen.

What is the minimum WBC count in dengue?

Dengue fever is characterized by leucopenia (White Blood Cells (WBC) < 5000 cells/mm3), thrombocytopenia (< 150,000 cells/mm3), rising haematocrit (5–10%) and there should be no evidence of plasma leakage [10].

Where does dengue rash appear?

Rash in dengue fever is a maculopapular or macular confluent rash over the face, thorax, and flexor surfaces, with islands of skin sparing. The rash typically begins on day 3 and persists 2-3 days. Fever typically abates with the cessation of viremia.

What is the fastest way to recover from dengue fever?

Diet tips for dengue for fast recovery
  1. Foods to eat.
  2. Papaya leaf juice. Papaya leaf juice is a quite famous remedy for dengue fever.
  3. Vegetable juices. Vegetables are rich in essential nutrients.
  4. Coconut water. It is recommended to drink coconut water in dengue to avoid dehydration.
  5. Herbal tea.
  6. Neem leaves.
  7. Foods to avoid.

What are the signs of recovery from dengue?

Patients with uncomplicated Dengue fever usually recover completely in 10-15 days.

Duration of Illness in Dengue:

  • Symptoms usually last 2 to 7 days.
  • Fever subsides in 4-5 days.
  • Low platelet count usually persists for 5-7 days after fever subsides. Thereafter, platelet count usually starts recovering gradually.

What does a dengue rash look like?

A flat, red rash may appear over most of the body 2 to 5 days after the fever starts. A second rash, which looks like the measles, appears later in the disease. Infected people may have increased skin sensitivity and are very uncomfortable.

What is the last stage of dengue?

Warning signs of progression to severe dengue occur in the late febrile phase around the time of defervescence, and include persistent vomiting, severe abdominal pain, fluid accumulation, mucosal bleeding, difficulty breathing, lethargy/restlessness, postural hypotension, liver enlargement, and progressive increase in

How does a dengue bite look like?

They usually bite you on the ankles and elbows. The only way to differentiate between a dengue mosquito bite and a normal mosquito bite is that that a dengue mosquito bite is much redder and itchy compared to a normal mosquito bite.

What is the reason for dengue?

When a mosquito bites a person infected with a dengue virus, the virus enters the mosquito. Then, when the infected mosquito bites another person, the virus enters that person's bloodstream and causes an infection.

Does dengue bite leave a mark?

Dengue is transmitted by the bite of the Aedes mosquito that typically attacks during day time. Its favorite spots are below the elbow and below the knee.

How can we build immunity to dengue?

Dengue fever prevention: Immunity boosting foods
  1. Citrus foods. Citrus foods are rich in vitamin C which helps in building strong immunity.
  2. Garlic. Garlic adds a strong taste to the food.
  3. Yogurt. Yogurt is a strong probiotic which stimulates the functioning of the immune system.
  4. Spinach.
  5. Almonds.
  6. Turmeric.
  7. Ginger.

Which test is best for dengue?

Here are the common tests recommended to diagnose dengue:
  1. Dengue NS1 Antigen. This is a blood test to detect the dengue virus early in the course of an infection.
  2. Immunoglobulin M (IgM)
  3. Immunoglobulin G (IgG)
  4. Dengue RNA PCR test.

How much platelet count is normal in dengue?

The normal platelet count in the body ranges from 1.5 to 4 lacs, this can go down to as low as 20,000 to 40,000 in the case of dengue patients. This happens because: Dengue can damage your bone marrow, the platelet-producing centre of the body. The dengue virus can affect your blood cells and damage your platelets.

Can dengue be detected on first day of fever?

Dengue nonstructural protein 1 (NS1) is an antigen produced in abundance by the replicating dengue virus as early as the first day of symptoms and as late as day 18 of symptoms. NS1 can be detected in the blood sooner than IgM, which cannot be reliably detected until days 6 to 10.

Who algorithm for diagnosis of dengue fever?

The most widely used test in the diagnosis of dengue infection is the detection of anti-dengue antibodies (IgM and IgG)22. These tests have two versions: ELISA and strip (rapid test).

What virus causes dengue?

Dengue is a mosquito-borne viral infection. The virus responsible for causing dengue, is called dengue virus (DENV). There are four DENV serotypes, meaning that it is possible to be infected four times.

Can dengue happen twice?

Yes. It is possible to get dengue more than once. There are four different strains (serotypes) of the dengue virus. If a person has suffered from one virus, there can be a repeat occurrence if a different strain is subsequently involved.