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C-Reactive Protein (Blood Test, Normal, Low, High Ranges) Topic Guide

C-Reactive Protein (Blood Test, Normal, Low, High Ranges) C-Reactive Protein (Blood Test, Normal, Low, High Ranges): C-reactive protein (CRP) is a marker of inflammation somewhere in the body. When there is inflammation in the body, the CRP levels increase. Elevated c-reactive protein levels in the blood have been associated with increased risk of heart disease, heart attack, and stroke.