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Serum free light chain (FLC) assays show lot-to-lot variability, impacting diagnostic accuracy. Validating manufacturer reference ranges is crucial for reliable FLC measurement in plasma cell disorders.

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Area of Science:

  • Clinical Chemistry
  • Immunology
  • Hematology

Background:

  • Serum free light chain (FLC) measurement is vital for managing plasma cell proliferative disorders.
  • Clinical studies often rely on manufacturer-provided reference ranges for FLC assays.
  • Reproducibility and validation of these ranges are essential before routine clinical use.

Purpose of the Study:

  • To evaluate the reproducibility of the serum FLC immunoassay.
  • To validate the manufacturer's reference range for FLCs.
  • To assess lot-to-lot variability in FLC assays.

Main Methods:

  • Imprecision was assessed using internal quality control materials and pooled serum.
  • Reference ranges were determined using sera from 162 healthy blood donors.
  • The κ/λ FLC ratio was validated with sera from 43 patients with polyclonal hypergammaglobulinemia.
  • Immunoassays were performed on a nephelometer using Freelite reagents.

Main Results:

  • Imprecision studies showed mean coefficients of variation (CV) of 16.09% for κFLC and 16.72% for λFLC.
  • Lot-specific calculations yielded different mean values and lower CVs compared to pooled analysis.
  • Reference ranges for κFLC and λFLC were established as 4.52-22.33 mg/L and 4.84-21.88 mg/L, respectively.
  • The κ/λ ratio range (0.65-2.36) was validated.
  • Retesting with different reagent lots showed mean bias percentages of 17.60% for κFLC and 15.26% for λFLC.

Conclusions:

  • The study confirmed significant lot-to-lot variability in FLC assays, even for polyclonal light chains.
  • These findings underscore the necessity of rigorous validation of reference values before implementing FLC assays in clinical practice.
  • Accurate FLC measurement requires careful attention to assay variability and appropriate reference range validation.