An erythrocyte sedimentation rate (ESR) determination is prescribed for a client with a connective tissue disorder. The client asks the nurse about the purpose of the test. What should the nurse tell the client about the purpose of the test?
A. Determines the presence of antigens
B. Identifies which additional tests need to be performed
C. Confirms the diagnosis of a connective tissue disorder
D. Confirms the presence of inflammation or infection in the body
