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Table 3 Validation results by parallel testing with the National TB Reference Laboratory (NTRL) as reference (n = 14)

From: Feasibility of establishing a biosafety level 3 tuberculosis culture laboratory of acceptable quality standards in a resource-limited setting: an experience from Uganda

Current laboratory NTRL  
Test method Results Positive Negative Total
Smear microscopy Positive 7 0 7
  Negative 1 6 7
  Sensitivity   87.5
  Specificity   100
  Kappa    0.9
Sputum culture (MGIT) Positive (MTBc) 7 0 7
  Negative 1 6 7
  Sensitivity   87.5
  Specificity   100
  Kappa    0.9
Sputum culture (LJ) Positive (MTBc) 6 0 6
  Negative 1 7 8
  Sensitivity   85.7
  Specificity   100
  Kappa    0.9
  1. LJ, Lowenstein-Jensen; MGIT, Mycobacterial growth indicator tube; MTBc, Mycobacterium tuberculosis complex.