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Table 2 Influenza diagnosis status versus laboratory test results

From: Evaluation of the accuracy of diagnostic coding for influenza compared to laboratory results: the availability of test results before hospital discharge facilitates improved coding accuracy

Influenza diagnosis Laboratory results
PCR+ PCR− Total
ICD10+ 2381 146 2527
ICD10− 378 13,534 13,912
Total 2759 13,680 16,439
Accuracy measures (95% CI)    
 Sensitivity 86.3 (85.0–87.6)   
 Specificity 98.9 (98.7–99.1)   
 PPV 94.3 (93.2–95.1)   
 NPV 97.3 (97.0–97.5)   
  1. PPV positive predictive value, NPV negative predictive value