Vitrex Vacusence Written by Bernie Webb on 24 May 2021. Posted in Vitrex. Serum Clot Activator Tubes. Vitrex Vacusence Serum Clot Activator Tubes are used for clinical biochemistry and immunology. The inner wall of the Serum Clot Activator tube is specially coated with clot activator, which activates the coagulation process. vitrex Prev Next