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What Are Normal , Low, and High Ranges for C-Reactive Protein? CRP is measured in the blood from a blood sample that is sent to a laboratory for analysis. Traditionally, CRP levels have been measured within the 3 to 5 mg/L range in assessing for inflammation. Normal CRP Levels: Less than 10 mg/L for a standard CRP test. Healthy individuals usually have very low or undetectable CRP levels. Elevated CRP Levels: Levels higher than 10 mg/L suggest inflammation, which may indicate an infection, autoimmune disorder, or chronic inflammatory condition. However, the most accepted normal range is typically less than 0.3 mg/dL . Elevated levels of CRP may indicate inflammation. C-reactive protein high levels, typically ranging from 10 to 50 mg/dL, suggest moderate inflammation. In a healthy adult, a CRP value less than 3 mg/L is considered normal. The CRP values above 3 mg/L may indicate inflammation. The degree of inflammation is often reflected in the magnitude of the CRP value, and higher levels may indicate more severe inflammation.