KFLC test performance using 1 mg/L as the cut-off
| KFLC | n | OCB IEF | P value (McNemar test) | |
| Negative | Positive | |||
| Negative | 31 | 28 (87.5%) | 4 (12.5%) | 1 |
| Positive | 33 | 3 (9.4%) | 29 (90.6%) | |
| Agreement (%) | 89.1 | |||
| Cohen’s k | 0.8 | |||
IEF, isoelectrofocusing; KFLC, kappa free light chain.