Table 3.

Comparison of rifampicin susceptibility testing by method of absolute concentrations on LJ, MGIT and Xpert (N=119)

LJ result	MGIT result	Xpert result	Direct Xpert n	Concentrated Xpert n
R	R	R	43	43
R	S	R	1	1
S	R	R	1	1
S	S	R	1	1
R	R	S	1	1
R	S	S	4	4
S	S	S	28	27
N/A	R	R	11	11
N/A	S	S	10	9
R	N/A	R	1	1
N/A	N/A	S	7 a	6 b
N/A	N/A	R	7 c	4 d
N/A	S	N/A	1	2
S	S	N/A	0	1
N/A	N/A	N/A	3	7

Note. R=resistant; S=susceptible; N/A=result not available (contamination on LJ or MGIT or “invalid”, “error” result on Xpert).

^a2 of 7 specimens were from cases with TB ruled out;

^b3 of 6 specimens were from cases with TB ruled out;

^c1 of 7 specimens from case with TB ruled out;

^d1 specimen from case with TB ruled out.