ANSWER: 20-30%
In a case series by Boils et al. which included 49 patients with GN due to IE, 28% of them had positive ANCA antibodies. Of note, in this study it was described that only 29 out of 49 patients had serology drawn for ANCA, 21 were negative (72%) and 8 (28%) were positive.
Reference:
Boils CL, et al. Update on endocarditis-associated glomerulonephritis. Kidney Int 2015; 87(6): 1241-1249.
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