The normal range for C-reactive protein, or CRP, is less than 1.0 milligram per deciliter or less than 10 milligrams per liter. An elevated CRP level generally indicates long-term disease or infection.
CRP levels of 1 mg per liter or lower are considered low risk for cardiovascular disease.
CRP levels of 1-3 mg per liter are considered moderate risk for cardiovascular disease.
CRP levels greater than 3 mg per liter are considered high risk for cardiovascular disease.
CRP levels greater than 10 mg per liter may suggest an acute coronary process, such as heart attack (acute myocardial infarction).