Lymph, specifically lymphocytes, are a type of white blood cell that are assessed in a Complete Blood Count (CBC). The CBC doesn't directly measure "lymph," but it includes measurements related to lymphocytes. The reference explains the following:
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A CBC includes an absolute lymphocyte count, which is the total number of lymphocytes in the body.
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A CBC may also include a white blood cell (WBC) differential, which measures the percentage of each type of white blood cell (including lymphocytes) in the body.
Therefore, a CBC provides information about the lymphocytes, which are a crucial part of the lymphatic system.