CRP and temporal arteritis: In 2011, Walvick and Walvick conducted a study and discovered that the odds of a positive biopsy for GCA were 1.5 times greater with an ESR over 47 mm/h, 5.3 times greater with a CRP > 2.45 mg/dL, and 4.2 times greater with platelets > 400,000/μL [18].