Preparation of DTS panels for stability evaluation
The dilutions of the positive sera were carried out with negative sera.
Serial dilutions were used to dilute positive sera to produce 4 levels
of positive samples ranging from strong positive to weak positive, which
was diluted 1:4. The negative serum samples were similarly prepared for
DTS. Sufficient quantity of DTS panels were prepared for 15 weeks
stability evaluation (based on the weekly testing), In addition, about
20% extra samples were prepared for any unexpected concern. All samples
were stored at room temperature during the period of stability
evaluation.