Table 5. Quality indicators of Xpert MTB/RIF testing of the National TB Reference Laboratory of Ethiopia, 2018.

Month	Samples Tested N (%)	Indicator 1: MTB positivity rate	Indicator 2: RIF resistance rate	Indicator 3: RIF indeterminate rate	Indicator 4: Error rate	Indicator 5: Invalid rate	Indicator 6: ‘No result’ rate	Indicator 7 (TAT≤24hrs)	Indicator 7 (TAT≤48hrs)
January	269 (10.7)	49 (18.8)	0 (0.0)	0 (0.0)	9 (3.4)	0 (0.0)	0 (0.0)	87 (32.3%)	256 (95.2%)
February	294 (11.7)	50 (18.1)	1 (2.0)	0 (0.0)	18 (6.1)	0 (0.0)	0 (0.0)	159 (54.1%)	283 (96.3%)
March	287 (11.4)	43 (15.9)	3 (7.0)	0 (0.0)	16 (5.6)	0 (0.0)	0 (0.0)	127 (44.3%)	276 (96.2%)
April	257 (10.2)	45 (20.1)	3 (6.7)	0 (0.0)	30 (11.7)	0 (0.0)	3 (1.2)	105 (40.9%)	255 (99.2%)
May	226 (9.0)	38 (19.3)	2 (5.3)	2 (5.3)	28 (12.4)	0 (0.0)	1 (0.4)	167 (73.9%)	222 (98.2)
June	155 (6.2)	21 (15.8)	0 (0.0)	0 (0.0)	21 (13.5)	0 (0.0)	1 (0.6)	123 (79.4%)	155 (100%)
July	238 (9.5)	34 (16.4)	3 (8.8)	1 (2.9)	24 (10.1)	0 (0.0)	7 (2.9)	185 (77.7%)	236 (99.2%)
August	264 (10.5)	35 (15.8)	3 (8.6)	0 (0.0)	42 (15.8)	0 (0.0)	1 (0.4)	202 (76.5%)	264 (100%)
September	212 (8.4)	35 (19.3)	3 (8.6)	0 (0.0)	28 (13.2)	1 (0.5)	2 (0.9)	170 (80.2%)	210 (99.1%)
October	36 (1.4)	5 (14.3)	0 (0.0)	1 (20.0)	1 (2.8)	0 (0.0)	0 (0.0)	36 (100%)	36 (100%)
November	142 (5.6)	35 (25.5)	0 (0.0)	0 (0.0)	5 (3.5)	0 (0.0)	0 (0.0)	119 (83.8%)	141 (99.3%)
December	135 (3.4)	25 (18.9)	2 (8.0)	0 (0.0)	3 (2.2)	0 (0.0)	0 (0.0)	131 (97.0%)	135 (100%)
Total	2515 (100)	415 (18.2)	20 (4.8%)	4 (1.0%)	225 (8.9)	1 (0.04)	15 (0.6)	1611 (64.1%)	2469 (98.2%)

Green: within the target; Yellow: around the margin of the target; Red: above the target

Indicators 1–7: calculated as per the definitions in Table 1