Performance Evaluation of Serum Free Light Chain Analysis: Nephelometry vs Turbidimetry, Monoclonal vs Polyclonal Reagents.

Abstract:

Objectives:Free light chain (FLC) measurement gained a lot of interest for diagnostic workup of monoclonal gammopathy. Methods:We evaluated the performance of turbidimetric polyclonal Freelite (The Binding Site, Birmingham, UK) assays on Cobas 6000 (Roche Diagnostics, Rotkreuz, Switzerland) and nephelometric monoclonal N Latex (Siemens Healthcare Diagnostics, Marburg, Germany) assays on BN ProSpec (Dade Behring, Deerfield, IL) vs established nephelometric Freelite assays on BN ProSpec. Results:Analytical performance was acceptable. Method comparison (n = 118) showed significant proportional FLC differences for N Latex assays. However, good correlation and clinical concordance were shown. Recovery study in the low concentration range demonstrated consistent over- and underrecovery for Freelite reagents, hampering future research on prognostic value of suppressed noninvolved FLC. Antigen excess detection was successful for κ FLC in three-fourths of cases with Freelite reagents and in all cases with N Latex reagents. However, the latter resulted in underestimated κ FLC concentrations. Conclusions:FLC analysis requires continuous awareness of analytical limitations. Monitoring of disease response requires FLC analysis on the same platform using the same reagents.

journal_name

Am J Clin Pathol

authors

Messiaen AS,De Sloovere MMW,Claus PE,Vercammen M,Van Hoovels L,Heylen O,Debrabandere J,Vanpoucke H,De Smet D

doi

10.1093/ajcp/aqx037

subject

Has Abstract

pub_date

2017-06-01 00:00:00

pages

611-622

issue

6

eissn

0002-9173

issn

1943-7722

pii

3860304

journal_volume

147

pub_type

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