Joint pain alongside a positive antinuclear antibody (ANA) test may suggest the presence of an underlying condition causing pain and discomfort.

Medically reviewed by Anita C. Chandrasekaran, MD An ANA blood test (antinuclear antibody test) is usually performed on a blood sample as part of the diagnostic process for certain autoimmune ...

Fact checked by Marley Hall Medically reviewed by Femi Aremu, PharmD If you're testing for COVID-19, you'll want to know what a positive test looks like—and what it means if you get a faint line ...