Table 2.

Test characteristics of direct PA testing for ITP diagnosis and confirmation of clinical remission

Test characteristicPositive assay, ITP diagnosisNegative assay, clinical remission
Sensitivity, % (95% CI) 90 (85-93) 87 (76-93) 
Specificity, % (95% CI) 78 (69-85) 91 (87-93) 
Positive predictive value, % (95% CI) 90 (85-93) 65 (55-75) 
Negative predictive value, % (95% CI) 78 (69-85) 97 (94-99) 
Positive likelihood ratio 4.0 9.3 
Test characteristicPositive assay, ITP diagnosisNegative assay, clinical remission
Sensitivity, % (95% CI) 90 (85-93) 87 (76-93) 
Specificity, % (95% CI) 78 (69-85) 91 (87-93) 
Positive predictive value, % (95% CI) 90 (85-93) 65 (55-75) 
Negative predictive value, % (95% CI) 78 (69-85) 97 (94-99) 
Positive likelihood ratio 4.0 9.3 

CI, confidence interval.

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