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