Histologic grading systems are used to guide diagnosis, therapy, and audit on an
international basis. The reproducibility of grading systems is usually tested within small
groups of pathologists who have previously worked or trained together. This may
underestimate the international variation of scoring systems. We therefore evaluated the
reproducibility of an established system, the Banff classification of renal allograft pathology,
throughout Europe. We also sought to improve reproducibility by providing individual …