The level of cerebrospinal fluid (CSF) lactate dehydrogenase (LDH) activity is useful in differentiating bacterial from viral meningitis and, along with the determination of the CSF blood cell counts and protein and glucose levels, aids in the classification of meningitis.  Therefore, LDH CSF fluid tests are performed by healthcare professionals to screen for the underlying pathology in the brain and spinal cord and provide effective treatment interventions.