How do you know dengue report is positive?
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).
What is the normal range of dengue?
Reference Range: Dengue Fever Virus Antibody, IgG 1.64 IV or less: Negative – No significant level of detectable dengue fever virus IgG antibody. 1.65-2.84 IV: Equivocal – Questionable presence of antibodies. Repeat testing in 10-14 days may be helpful.
What is dengue IgM positive and IgG negative?
Positive IgM and IgG tests for dengue antibodies detected in an initial blood sample mean that it is likely that the person became infected with dengue virus within recent weeks. If the IgG is positive but the IgM is low or negative, then it is likely that the person had an infection sometime in the past.
What is the difference between dengue IgG and IgM?
The IgM become detectable on Day 3 to 5 of illness in case of primary dengue infection and persist for 2 to 3 months, whereas IgG appear by the fourteenth day and persist for life. Secondary infection shows that IgG rises within 1 to 2 days after onset of symptoms, simultaneously with IgM antibodies.
What is difference between dengue IgG and IgM?
What IgM positive means?
IgM is usually the first antibody produced by the immune system when a virus attacks. A positive IgM test indicates that you may have been recently infected or vaccinated and your immune system has started responding to the vaccination or that your immune system has started responding to the virus.
How long is dengue IgG positive?
In secondary dengue infections, IgG titers rise to extremely high levels (much higher than in primary infections) from the day 7 of fever to the next two weeks (9, 11). Anti-Dengue IgG antibodies persist for a long time even up to years (3, 12).
What is the normal value of NS1 antigen?
An NS1 Ag level varies from 0.5-2 μg/ml in acute-phase serum samples, to less than 0.04 μg/ml in convalescent phase serum [11]. The requirement of paired sera, subsequently in convalescent phase, if negative in acute phase also delays diagnosis.
What is RBC count in dengue?
RBCs count were significantly higher in patients with dengue infection (4.99 × 106 /µL vs. 4.91 × 106 /µL; p value=0.039). Platelets count were significantly lower in the patient with dengue infection compared to patients with non-dengue infection (75,000 × 103 /µL vs. 86,000 × 103 /µL; p value=0.042).
What is the lowest platelet count in dengue?
A typical person has a platelet count of between 150,000 and 250,000 per microlitre of blood. About 80 to 90 per cent of patients with dengue will have levels below 100,000, while 10 to 20 per cent of patients will see critically low levels of 20,000 or less.
What is the normal range for dengue test?