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Table 3 Validity and accuracy analysis of the Saliva test (screening process) results versus the blood test (“golden standard”) results collected from the 340 VCT clients

From: Introducing rapid oral–fluid HIV testing among high risk populations in Shandong, China: feasibility and challenges

   Blood testing Total
   Positive Negative  
Saliva testing Positive 31 1 32
  Negative 9 299 308
Total   40 300 340
  1. Sensitivity (true positive rate) = 0.775.
  2. Specificity (true negative rate) = 0.997.
  3. Rate of misdiagnosis (false positive rate) = 0.003.
  4. Positive predictive value (PPV) = 0.969.
  5. Negative predictive value (NPV) = 0.971.
  6. Accuracy (ACC) = 0.980.
  7. Consistency rate = 0.970.