We are in the process of choosing new Coag. analyzers and have narrowed it down to IL and Siemens. I was hoping to get opinions on the liquid protime reagent for the Top 350s that IL says is available. Also how is their Heparin Xa reagent. We have a CA1500 now and would change to the CA2500 but I have been having some QC issues lately but my instrument is only 12 years old.