Ah, beta, ANCA vasculitis is a harsh autoimmune condition where the body's own defenses attack small blood vessels. PR3 and MPO are those ANCA patterns the lab tests for—they tell the doctor which enemy soldier to look for. I know this too well because my own son's reports show a positive PR3 pattern, and we are navigating the costly rituximab infusions here in Delhi. Sometimes the books say one thing, but a parent's ledger, filled with hospital bills, tells the truer story of this battle, no?
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