An Automated Assay for Growth Differentiation Factor 15.

Area of Science:

• Clinical Chemistry
• Biomarker Discovery
• Cardiovascular Disease Research

Background:

• Growth Differentiation Factor 15 (GDF-15) is a key biomarker for cardiovascular disease (CVD) burden and risk.
• Accurate and efficient measurement of GDF-15 is crucial for clinical applications.

Purpose of the Study:

• To evaluate the analytical performance of a new, fully automated electrochemiluminescence immunoassay (Elecsys® GDF-15 assay) for GDF-15 measurement.
• To assess the assay's precision, reproducibility, and correlation with existing methods.

Main Methods:

• Six laboratories assessed the Elecsys® GDF-15 assay under routine conditions.
• Evaluated within-run, within-laboratory, and between-laboratory precision.
• Compared Elecsys assay results with a research immunoradiometric assay (IRMA) and ELISA, and measured GDF-15 in 739 healthy individuals.

Main Results:

• Excellent precision with CVs ranging from 0.7% to 8.6% for within-run and within-laboratory measures.
• High between-laboratory precision (CVs 7.1%–8.9%) and comparable GDF-15 recovery across sample types and reagent lots.
• Strong correlation and agreement between the Elecsys assay and IRMA/ELISA in the clinically relevant range.

Conclusions:

• The Elecsys GDF-15 assay exhibits robust analytical performance in routine laboratory settings.
• This automated immunoassay provides a reliable method for quantifying GDF-15 in both serum and plasma.
• Findings support the use of this assay for GDF-15 assessment in cardiovascular research and clinical practice.