Table 2. Number of tests conducted per patient on Xpert MTB/RIF far a valid result (N =  40,035 patients tested).

Number of tests per patient	Number of patient specimen tested	Patients with valid result	%	Test failures	Test failures retested	%	Test failures not repeated	%	Cumulative number of valid results	%
Single test	40035	37157	92.8%	2878	2594	90.1%	284	9.9%	37157	92.8%
Single repeat test	2594	2253	86.9%	341	287	84.2%	54	15.8%	39410	98.4%
Repeat tests twice	287	227	79.1%	60	44	73.3%	16	26.7%	39637	99.0%
3 or more repeat tests	60	43	71.7%	17	16	94.1%	1	5.9%	39680	99.1%