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Table 3 Diagnostic performance (%) of FT MTB assay against MTB blood culture as reference standard in relation to blood volume extracted

From: Higher blood volumes improve the sensitivity of direct PCR diagnosis of blood stream tuberculosis among HIV-positive patients: an observation study

 

TP

FP

FN

TN

Sensitivity, % (95% CI)

Specificity, % (95% CI)

PPV, %

NPV, %

Concordance, %

Study A (n=42)

3

1

6

32

33(8–70)

97(84–100)

75

84

83

Study B (n=31)

5

1

2

23

71(29–96)

96(79–100)

83

92

90

  1. CI=Confidence Interval, FN=False Negative, FN=False Positive, NPV=Negative Predictive Value, PPV=Positive Predictive Value, TN=True Negative, TP=True Positive.