Beckman Coulter Diagnostics, Brea, Calif, has released a cystatin C assay for the company’s AU family of low- to ultra-high-volume clinical chemistry systems and Immage 800 immunochemistry systems. The assay is an in vitro diagnostic test for quantitative determination of cystatin C in human serum and plasma. Measurement of cystatin C is used in the diagnosis and treatment of renal diseases, and simplifies patient testing by not being as susceptible as other renal function tests to diet, gender, muscle mass, or age. For added convenience, the assay is offered in a barcoded, liquid, ready-to-use format for the clinical chemistry systems. The assay’s measuring range is 0.4 to 8.0 mg/L, and it has a sensitivity limit of quantification of 0.23mg/L. On the AU systems, the cystatin C test is performed using an immunoturbidimetric method; on the Immage systems it is performed using a nephelometric method. For more information, visit Beckman Coulter.