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Table 3 Diagnostic performance of a combination of CRP (mg/L) and Platelet (109/L) tests for GCA

From: The utility of ESR, CRP and platelets in the diagnosis of GCA

Diagnostic Performance Test Criteria
CRP > = 20 or Platelets > = 300 CRP > = 20 and Platelets > = 300
Sensitivity% 87.1 (80.3, 92.1) 51.1 (42.5, 59.6)
Specificity% 46.6 (37.8, 55.5) 84.0 (76.5, 89.8)
PPV% 63.4 (56.1, 70.2) 77.2 (67.2, 85.3)
NPV% 77.2 (66.4, 85.9) 61.8 (54.2, 69.0)
% Correct 67.4 67.4