Table 1.

Key laboratory parameters at admission

Parameter	Value	Normal range
Serum creatinine – mg/dL eGFR – mL/min/1.73 m2 BUN – mg/dL CRP – mg/L c-ANCA IIF – titer PR3-ANCA – IU/mL MPO-ANCA – IU/mL C3c – g/L C4 – g/L uPCR – mg/g uACR – mg/g Urinary IgG Urinary kappa – mg/L Urinary lambda – mg/L Kappa/lambda ratio	8.19 6.2 83 235.1 1:1,000 156  < 0.2 1.46 0.18 2,884.1 1,470.83 129 70.4 42.4 1.66	0.7–1.2  > 60 8–26  ≤ 5.0  < 1:10  < 2  < 3.5 0.82–1.93 0.15–0.57  < 300  < 30  < 9.6  < 6.8  < 3.7  > 1 or < 5.2

c-ANCA cytoplasmic anti-neutrophil cytoplasmic antibodies, BUN blood urea nitrogen, C3c complement factor 3 conversion product, C4 complement factor 4, CRP C-reactive protein, eGFR estimated glomerular filtration rate (CKD-EPI), IgG immunoglobulin G, IIF indirect immunofluorescence, MPO myeloperoxidase, PR3 proteinase 3, uACR urinary albumin-to-creatinine ratio, uPCR urinary protein-to-creatinine ratio