WHO grading scale
ZNFreq (%)
Auramine OFreq (%)
PREVI FluoFreq (%)
Slide A(1
st
spot)Scanty
3(1.2)
14(46.7)
10(4)
1+
8(3.2)
4(13.3)
3(1.2)
2+
2(0.8)
4(13.3)
3(1.2)
3+
6(2.4)
8(26.7)
10(4)
Slide B(morning)Scanty
3(1.2)
12(4.8)
10(4)
1+
6(2.4)
6(2.4)
4(1.6)
2+
4(1.6)
4(1.6)
4(1.6)
3+
4(1.6)
8(3.2)
10(4)
Slide C (2
nd
spot)Scanty
14(5.6)
12(4.8)
14(5.6)
1+
4(1.6)
4(1.6)
6(2.4)
2+
4(1.6)
6(2.4)
3(1.2)
3+
8(3.2)
7(2.8)
8(3.2)
Table 2:
Grading results of PTB positive results in ZN, Auramine O and PREVI Fluo TB methods based on WHO grading system, 2012.
