The Johns Hopkins Lupus Center /www.hopkinslupus.org/lupus-tests/lupus-blood-tests/ we never demand lupus patients who never tested positive for ANA http://www.hopkinslupus.org/lupus-tests/lupus-blood-tests/ we never demand Análisis de sangre en lupus to rule out a comorbid diagnosis of SLE Johns Hopkins Lupus Center http://www.hopkinslupus.org/lupus-tests/lupus-blood-tests/