Table 5

Accuracy, sensitivity and specificity of the haemocell test +/– guiaic test for the diagnosis of colorectal cancer

Sensitivity (95% CI)Specificity (95% CI)Accuracy (95% CI)PPV (95% CI)NPV (95% CI)
Haemocell alone74% (57 to 86)89% (86 to 90)87% (83 to 90)46% (36 to 54)96% (94 to 98)
Haemocell with 3+ guaiac97% (84 to 100)49% (47 to 49)55% (51 to 55)20% (18 to 21)99% (96 to 100)
  • NPV, negative predictive value; PPV, positive predictive value.