1st Classification Criteria for IgG4-Related Disease Published

This question is drawn from "ACR/EULAR Release New Classification Criteria for IgG4-Related Disease" The Rheumatologist, March 2020.

Which of these statements is true?

A. The classification criteria for IgG4-RD are diagnostic criteria.

B. The IgG4-RD classification criteria employ a two-step process, with inclusion and exclusion criteria.

C. A biopsy is needed for the diagnosis of IgG4-RD.

D. The new classification criteria for IgG4-RD, using a threshold of 20 points, had a very high specificity and moderately high sensitivity (over 97% and 82% respectively).