For instance, Lee et al. (9) found that PCT is both specific and sensitive in the diagnosis of infection in elderly patients when leukocytosis is specific (specificity, 0.86) but poorly sensitive (sensitivity, 0.26), and they noted that CRP is highly sensitive (sensitivity, 0.91) but nonspecific (specificity, 0.36). This evidence concerns the gene CRP and Increased total leukocyte count.