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Table 3 Diagnostic performance of CT Chest compared to biological testing (BT) of COVID-19

From: Submillisievert CT chest for COVID-19 patients in a rural hospital with limited resources

  N =  CT + BT +  CT-BT- CT + BT- CT-BT +  Se Sp PPV NPV Accuracy (%)
RT-PCT or Ag test           
FDCT 69 47 12 7 3 94% 63.2% 87% 80% 85.5
LDCT 99 73 7 12 7 91.2% 36.8% 85.9% 50% 80.8
RT-PCR           
FDCT 27 14 9 3 1 93.3% 75% 82.3% 90% 85.2
LDCT 27 22 0 2 3 88% NC 91.7% NC 81.5
Ag test           
FDCT 42 33 4 3 2 94.3% 57.1% 91.7% 66.7% 88.1
LDCT 72 51 7 10 4 92.7% 41.1% 83.6% 63.6% 80.6
  1. BT, Biological test; FDCT, full dose CT scan; LDCT, ultra-low dose CT scan; RT-PCR, reverse transcriptase polymerase chain reaction; Ag, Antigen; Se, Sensitivity; Sp, Specificity; PPV, Positive predictive value; NPV, Negative predictive value; NC, Not calculated