Measurement of amino terminal propeptide of type III procollagen (PIIINP) employing the ADVIA Centaur platform. Validation, reference interval and comparison to UniQ RIA

Abstract Recently, measurement of amino terminal propeptide of type III procollagen (PIIINP) was introduced as a part of the hepatic cirrhotic marker enhanced liver fibrosis™ test on the automated ADVIA Centaur We analyzed four control samples 20 times over a period of 5 days. Centaur PIIINP assay measurements were compared with the widely used UniQ PIIINP RIA assay (Orion Diagnostica, Espoo, Finland) using 55 patient samples (range=3.7–43.3 µg/L). Furthermore, we established a reference interval based on samples from 287 blood donors. In the concentration range 2.5–11.9 µg/L, the total imprecision was below 8%. Comparison with the UniQ PIIINP RIA assay yielded: Centaur PIIINP µg/L=1.9×(UniQ PIIINP RIA)+0.6 µg/L, r We conclude that the Centaur PIIINP assay is suitable for routine use with our newly defined reference interval. The results obtained by Centaur correlates well with those obtained by the previously employed RIA, though the absolute values are higher.