The Liaison XL 1,25 dihydroxyvitamin D assay from DiaSorin, Stillwater, Minn, is the first extraction-free, fully automated 1,25 dihydroxyvitamin D assay available on the market, according to the company. While previous 1,25 dihydroxyvitamin D assays have required a time-consuming upfront extraction step, the new Liaison assay eliminates that process, providing a time-to-first-result of 65 minutes. Available only on the Liaison XL analyzer, the Liaison assay is a chemiluminescent immunoassay for the quantitative determination of 1,25 dihydroxyvitamin D in serum, EDTA plasma, and lithium heparin plasma. Laboratories with Liaison XL analyzers can now run the Liaison 25 OH vitamin D total assay, Liaison N-Tact PTH Gen II, and Liaison XL 1,25 dihydroxyvitamin D together on one instrument, utilizing a single serum sample tube. For more information, visit DiaSorin.