An ANA can be negative even if you have Lupus. It is rare, but his is one the the problems? Is it rare because it is rare or because they are not testing for it

An ANA can be negative even if you have Lupus. It is rare, but his is one the the problems? Is it rare because it is rare or because they are not testing for it? https://www.hopkinslupus.org/lupus-tests/lupus-blood-tests/ https://www.hopkinslupus.org/lupus-tests/lupus-blood-tests/ "In fact, only 2% of people with lupus will have a negative ANA. People with lupus who have a negative ANA test may have anti-Ro/SSA or antiphospholipid antibodies." The current protocol is that if your ANA is negative they will not look any further. See figure 2: https://ard.bmj.com/content/78/9/1151 https://ard.bmj.com/content/78/9/1151