Testing for COVID-19

Area of Science:

• Medical Diagnostics
• Infectious Diseases
• Public Health

Background:

• Accurate and timely diagnostic tests are vital for effective COVID-19 clinical and public health management.
• Test selection depends on patient presentation and disease stage.

Purpose of the Study:

• To outline the appropriate use of different diagnostic tests for COVID-19.
• To emphasize the importance of pre-test probability in result interpretation.

Main Methods:

• Review of diagnostic methodologies for COVID-19.
• Discussion of nucleic acid tests (real-time reverse transcriptase-polymerase chain reaction), serology, and antigen tests.
• Emphasis on sample types, including combined nasal/nasopharyngeal and throat swabs.

Main Results:

• Nucleic acid tests are optimal for diagnosing acute COVID-19 infection.
• Serology is suitable for detecting previous infection over 14 days post-symptom onset.
• Antigen tests are under development with undefined roles.

Conclusions:

• Diagnostic test choice is contingent on clinical context and illness stage.
• Pre-test probability, based on clinical presentation and epidemiological risk, is essential for accurate result interpretation.