Tuberculosis diagnostic test results’   LTBI case
Old (Standard) New   Test score
definition
CXR TST QFT-GIT T-SPOT .TB  
   
           
- - - - 1 Negligible
+ - - - 2 Low
- + - - 3 Low
- - + - 4 Low
- - - + 5 Low
+ + - - 6 Average
+ - + - 7 High
- + + - 8 High
+ - - + 9 High
           
- + - + 10 High
- - + + 11 Extremely High
+ - + + 12 Extremely High
           
- + + + 13 Extremely High
+ + + + 14 Extremely High
           
CXR=chest X-ray, TST=tuberculin skin test, IGRAs=interferon gamma release assays, QFT-GIT=QuantiFERON Gold In-Tube test, T-SPOT .TB=T-SPOT .TB test, LTBI=latent tuberculosis infection
*Risk defined according to Thrusfield, M. (2007): Negligible (of likelihood)=Insignificant, Low=less than average, Average=usual amount of risk, High=above the normal or average level, Extremely high=outermost higher than average
Table 1: New classification representing categorization criteria for diagnosis of latent tuberculosis infection cases using a combination of four-tuberculosis diagnostic tests and score for latent tuberculosis infection case diagnosis.