The CRP (C-reactive Protein) test measures the level of this protein in the blood, which is produced by the liver in response to inflammation or infection in the body. CRP is a non-specific marker of inflammation and helps detect the presence and severity of inflammation (caused by infections, autoimmune diseases like rheumatoid arthritis, or tissue injury). The normal CRP level is typically <10 mg/L, but in acute inflammation (e.g., bacterial infections, sepsis, or post-surgery), it may rapidly rise to very high levels (even >100 mg/L). The hs-CRP (high-sensitivity) test is used to assess the risk of chronic inflammation associated with cardiovascular diseases. Although CRP cannot identify the exact cause of inflammation, it is useful for monitoring treatment response (e.g., decreasing CRP levels after antibiotics or anti-inflammatory drugs) and differentiating bacterial from viral inflammation. Results should be interpreted alongside clinical symptoms, medical history, and other tests (e.g., white blood cell count), as other factors like obesity, smoking, or pregnancy may also elevate CRP levels. This test requires a simple blood sample and serves as a rapid, accessible tool for initial inflammation assessment.