Video lesson
Why it’s ordered
When symptoms suggest GPA, MPA or EGPA, such as sinus disease with kidney or lung problems.
Understanding results
PR3-ANCA is typical of GPA and MPO-ANCA of MPA. A positive result supports, but doesn’t prove, vasculitis. Biopsy often confirms it.
Good to know
Some medicines and infections can cause positive ANCA.
At a glance
Type
Blood tests
Reviewed by Farhan Tahir, MD, FACR
Questions about your own care?
Book an in-person or telehealth consultation with Dr. Tahir.
For education only. Don’t start, stop or change a medicine without talking to your care team.