Validation of an equine serum amyloid A assay with an unusually broad working range.
Authors: Jacobsen Stine, Vinther Anne Mette, Kjelgaard-Hansen Mads, Nielsen Lise Nikolic
Journal: BMC veterinary research
Summary
# Editorial Summary: Validation of an equine serum amyloid A assay with an unusually broad working range Serum amyloid A represents a sensitive acute phase marker in horses, yet practical laboratory diagnostics have been limited by assays with narrow measurement ranges that require sample dilution in high-inflammation cases. Jacobsen and colleagues validated a new immunoturbidometric VET-SAA assay against established standards, systematically evaluating precision (intra- and interassay coefficient of variation), accuracy (linearity across serial dilutions), and detection limits using both pooled serum samples at varying SAA concentrations and comparison with the previously validated LZSAA assay. The VET-SAA assay demonstrated substantially improved analytical performance, permitting measurement across a notably broader concentration range whilst maintaining accuracy and precision—a practical advantage that eliminates the need for dilution of acute-phase samples and streamlines laboratory workflows. By measuring SAA in clinically diverse cases with and without inflammatory disease, the researchers confirmed the assay's clinical utility for detecting and monitoring inflammatory conditions in routine diagnostic settings. For equine practitioners, this validation supports adoption of the VET-SAA assay as a reliable, efficient tool for inflammation assessment across the full spectrum of clinical presentations, from subclinical disease to acute systemic inflammation.
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Practical Takeaways
- •VET-SAA is a validated, reliable method for detecting and monitoring inflammation in equine patients using serum samples in routine diagnostic settings
- •The broad working range of this assay means fewer sample dilutions are needed, making it more practical and cost-effective for clinical laboratories
- •SAA measurements can help distinguish inflammatory conditions and monitor treatment response, complementing clinical examination and other diagnostic tools
Key Findings
- •VET-SAA immunoturbidometric assay demonstrated acceptable intra- and interassay precision for measuring equine serum amyloid A across low, intermediate, and high concentration ranges
- •VET-SAA assay showed linear performance under dilution with reliable accuracy compared to previously validated LZSAA assay
- •The VET-SAA assay has an unusually broad working range suitable for routine diagnostic laboratory measurement of equine SAA in inflammatory conditions