Table 4 Frequency of abnormal results
Test | Cutoff for “abnormal” | All Stages (N = 5731) | Stage 1 (N = 4058) | Stage 2 (N = 981) | Stage 3 (N = 692) |
|---|---|---|---|---|---|
Urine Tests | |||||
Eosinophils | ≥1 % | 6.9 | 5.8 | 7.2 | 7.5 |
Total Protein | >15 mg/dl | 70.8 | 63.0 | 64.3 | 83.3 |
UPEP | M spike | 7.9 | 5.0 | 9.8 | 10.0 |
Blood Tests | |||||
ANCA | Titer > 1:20 | 10.6 | 8.0 | 3.7 | 14.9 |
Anti-GBM | ≥1.0 | 0 | 0 | 0 | 0 |
Cryoglobulin | >0 % | 21.8 | 26.3 | 0 | 21.2 |
C3 | <90 mg/dl | 36.5 | 26.9 | 21.1 | 45.6 |
C4 | <10 mg/dl | 12.9 | 11.6 | 10.5 | 14.3 |
Free Light Chains | See below | 41.6 | 44.7 | 42.9 | 36.7 |
SPEP | M spike | 19.1 | 16.4 | 23.9 | 19.7 |
Radiology Tests | |||||
Renal Ultrasound | See Methods | 34.6 | 40.6 | 23.4 | 34.9 |
CT Abdomen/Pelvis | See Methods | 33.3 | 26.7 | 27.3 | 39.3 |