The laboratory tests revealed the following: leucocytes count of 8.5 × 109/L, hemoglobin level of 79 g/L, urine protein (+), microhematuria (+), erythrocyte sedimentation rate of 50 mm/h, c-ANCA (antineutrophil cytoplasmic autoantibodies) with a titre of 1 in 100, and PR3-ANCA (anti-neutrophil cytoplasmic antibodies proteinase 3) of > 200 RU/ml. This evidence concerns the gene PRTN3 and Microscopic hematuria.