Table 1.

Samples with discordant serum free light chain (sFLC) ratios

Sample No	Clinical Diagnosis	sIFE	N latex FLC			Freelite
			κFLC, mg/L	λFLC, mg/L	Ratio	κFLC, mg/L	λFLC, mg/L	Ratio
1	IIMM	IgG/K	62.5	56.4	1.11	350	17.6	19.89
6	IIMM	IgG/K	13.6	10.2	1.33	12.0	7.1	1.70
11	IIMM	IgA/L	6.9	38.3	0.18	5.7	14.3	0.40
26	NSMM	Negative	34.2	58.2	0.59	25.7	172	0.15
35	IIMM	IgG/K	67.9	49	1.39	241	37	6.51
43	IIMM	IgG/L	21	39.4	0.53	19.3	158	0.12
47	LCDD	Negative	218	142	1.54	665	82.1	8.10
58	IIMM	IgG/L	10.7	19.5	0.55	9.9	1045	0.01
62	IIMM	IgA/L	4.7	8.04	0.59	5.6	417.5	0.01
74	IIMM	IgA/L	5.3	17.8	0.30	6.9	4.6	1.49

Abbreviations: FLC, free light chains; IIMM, intact immunoglobulin multiple myeloma; LCDD, light chain deposition disease; NSMM, nonsecretory multiple myeloma; sIFE, serum immunofixation electrophoresis.