1. Dengue NS1 Antigen Test

• Purpose: Detects the presence of the dengue virus's non-structural protein 1 (NS1) in the bloodstream.

• Timing: Effective within the first 17 days of fever onset, before the body produces antibodies.

• Advantages:

  • High sensitivity during the early phase of infection.

  • Helps in early diagnosis and timely management.

2. Dengue IgM/IgG Antibody Test

• Purpose: Detects antibodies produced by the body in response to dengue infection.

• Timing:

  • IgM: Appears approximately 45 days after infection, indicating recent exposure.

  • IgG: Develops later, indicating past infection or exposure.

• Advantages:

  • Helps determine the timing of infection (primary vs. secondary).

  • Useful in conjunction with the NS1 antigen test for comprehensive diagnosis.

• Availability in Delhi:

  • Apollo Diagnostics: Provides IgM/IgG ELISA tests, aiding in the differentiation of primary and secondary dengue infections.

  • Redcliffe Labs: Offers IgM antibody tests with reports in 15 hours.

  • House of Diagnostics (HOD): Provides IgM/IgG tests.

3. Dengue Rapid Diagnostic Test (RDT)

• Purpose: Offers quick results for dengue diagnosis, detecting NS1 antigen and antibodies simultaneously.

• Advantages:

  • Fast results, typically within 1530 minutes.

  • Portable and user-friendly, suitable for point-of-care settings.

• Limitations:

  • Lower sensitivity compared to ELISA tests.

  • May not detect early infections effectively.

Conclusion

Early and accurate diagnosis of dengue fever is essential for effective treatment and prevention of complications. In Delhi, various diagnostic options are available, ranging from the highly sensitive NS1 antigen ELISA tests to rapid diagnostic tests suitable for quick screenings. It's crucial to choose a reputable diagnostic center and consult with healthcare professionals to determine the most appropriate testing method based on individual symptoms and exposure history.