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Table 5 Sensitivity of direct ZN, concentrated FM and Magnetic bead-FM, as a function of reading time

From: Feasibility of magnetic bead technology for concentration of mycobacteria in sputum prior to fluorescence microscopy

Reading time

Cumulative No. positive

slides

New positive

slides

Yield of new positives/total

positives* (%)

Direct ZN

   

30 s

4

4

66.7%

1 min

4

0

0%

3 min

4

0

0%

5 min

6

2

33.3%

Concentrated FM

   

30 s

12

12

63.2%

1 min

14

2

10.5%

3 min

19

5

26.3%

5 min

19

0

0%

Magnetic bead

   

30 s

6

6

35.3%

1 min

11

5

29.4%

3 min

13

2

10.5%

5 min

17

4

23.5%

  1. *total number of slides positive by each method after 5 minutes examination time.