Table 2.

Distribution of results with the first singlicate and the second triplicate testing on the 200 whole blood samples stored at +4°C (WB4) and at−20°C (WB20)

First singlicate test		Second triplicate test		No. of cases	% of cases
WB4	WB20	WB4	WB20
Positive	Positive	NA	NA	133	66.5
Positive	Negative	NA	Positive	19	9.5
Positive	Negative	NA	Negative	3	1.5
Negative	Positive	Positive	NA	16	8.0
Negative	Positive	Negative	NA	3	1.5
Negative	Negative	Positive	Positive	7	3.5
Negative	Negative	Positive	Negative	3	1.5
Negative	Negative	Negative	Positive	1	0.5
Negative	Negative	Negative	Negative	15	7.5

NA, not applicable (second triplicate test run only on samples which were negative in first singlicate test).