For testing of pen-based oral fluids samples, 150 ml of oral fluid was mixed with 150 ml of Tris buffered saline, and then 200 ml of this final solution was added to the plate
For testing of pen-basedoral fluids samples, 150 ml of oral fluid was mixed with150 ml of Tris buffered saline, and then 200 ml of this finalsolution was added to the plate