Testing can help people make informed decisions when respiratory symptoms appear, after a possible exposure, or before contact with someone at higher risk. The right test and timing depend on the situation and local recommendations.
Rapid antigen tests
Antigen tests look for specific viral proteins and can often produce results quickly. They are useful tools, but a negative result does not always rule out infection, particularly early in an illness or when the amount of virus is low. Follow the product instructions and local advice about repeat testing.
Molecular tests
Molecular tests, including nucleic acid amplification tests (NAATs), detect genetic material from the virus. They are generally more sensitive than antigen tests, but availability and turnaround times vary. A healthcare professional can help determine whether this type of test is appropriate.
Read results in context
No test should be interpreted without considering symptoms, timing, exposure and the instructions for that specific test. If symptoms continue or worsen despite a negative result, seek medical advice.
Protect others while you are unwell
If you have respiratory symptoms, take reasonable precautions to reduce spread, such as staying home when possible, improving airflow and avoiding close contact with people at higher risk. Follow local public health guidance.
For current recommendations, see the CDC testing guidance or your local health authority.