Human Kappa Free Light Chain Assay

Assay Principle
Human Kappa Free Light Chain Assay is based on a latex enhanced immunoturbidimetric assay. Kappa FLC in the sample binds to specific anti-Kappa FLC antibody, which is coated on latex particles, and causes agglutination. The degree of the turbidity caused by agglutination can be measured optically and is proportional to the amount of Kappa FLC in the sample. The instrument calculates the Kappa FLC concentration by interpolation of obtained signal of a 6-point calibration curve prepared from calibrators of known concentrations.

Features
Human Kappa Free Light Chain (FLC) assay has excellent linearity across the Analytical Measuring Interval (AMI) in standard mode: 2.9 – 150 mg/L; extended mode: 2.9 – 3000 mg/L. The method comparison gave a linear regression coefficient of 0.977, a slope of 0.958 and y-intercept of -2.536 mg//L. Precision of the assay was evaluated according to the CLSI EP5-A guidelines and has a Within-Run precision from 1.1% - 7.9% and a Total Precision of 1.7% - 11.7%. The Kappa assay displays outstanding sensitivity with an LOD of 1.8 (Export 1.4) mg/L; LOQ of 2.9 (Export 2.3) mg/L; and a LOB determined to be 0.9 mg/L.

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