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(A) Data of cohort II in double logarithmic IgG, IgA, IgM, and FLC-k quotient diagrams. All patients had a QFLC-k below the corresponding Qlim–FLC-k. (B) Data of the control group with a QFLC-k < Qlim–FLC-k (∇) and simulated blood contamination with 0.005 mL (○), 0.010 mL (□), 0.050 mL (◊), and 0.100 mL (∆) of serum in double-logarithmic IgG, IgA, IgM, and FLC-k quotient diagrams. QFLC-k = free light chain kappa quotient, Qlim–FLC-k = upper limit of the hyperbolic reference range.
