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. Author manuscript; available in PMC: 2022 May 1.
Published in final edited form as: Clin Chim Acta. 2021 Feb 2;516:136–141. doi: 10.1016/j.cca.2021.01.021

Table 3.

M-protein detection rates

B N=23 (%) C2 N=23 C3 N=20 C4 N=21 C5 N=22 C6 N=23 C7 N=22 C8 N=23 EOT N=22
SPEP, IFE and FLC 23 (100) 22 (95.6) 18 (90) 16 (76.2) 16 (72.7) 17 (73.9) 16 (72.7) 16 (69.5) 14 (63.6)
MALDI-TOF MS 23 (100) 21 (91.3) 19 (95) 18 (85.7) 17 (77.3) 17 (73.9) 15 (68.2) 15 (65.2) 13 (59.1)
MALDI-TOF MS and FLC 23 (100) 22 (95.6) 20 (100) 19 (90.5) 18 (81.8) 18 (78.3) 16 (72.7) 16 (69.5) 14 (63.6)

SPEP: serum protein electrophoresis, IFE: immunofixation electrophoresis, FLC: free light chain, MALDI-TOF MS: Matrix- assisted laser desorption ionization time of flight mass spectrometry