What type of sample is typically used for measuring CRP levels?

Measuring C-reactive protein (CRP) levels is typically done using a blood sample. CRP is an acute-phase protein produced by the liver in response to inflammation. Since it circulates in the bloodstream, a blood sample provides the most direct and reliable means of assessing CRP levels. This is crucial for diagnosing and monitoring various inflammatory conditions, including infections, autoimmune disorders, and chronic inflammatory diseases. Blood samples offer the necessary components needed to accurately quantify CRP, making this choice the most appropriate for the test.

Other types of samples, such as urine, saliva, or tissue samples, are not standard for CRP testing. While they can provide valuable information in some medical contexts, they do not have the same relevance for assessing CRP levels specifically.