The new Acusera parathyroid hormone (PTH) control from the quality control division of Randox Laboratories, Crumlin, UK, is a third-party control for assessing the performance of tests for the measurement of intact PTH. The notoriously unstable marker, present in a number of immunoassay controls, is now available in a liquid, human-based serum format. The product has an open-vial stability of 30 days at 2–8°C, and a 2-year shelf life. It is designed to deliver an unbiased, independent assessment of analytical performance with any instrument or method. For more information, visit Randox.