Final answer:
A low CSF Gluc test indicates a low glucose level in cerebrospinal fluid, and is significant in diagnosing certain neurological conditions.
Step-by-step explanation:
A low CSF Gluc test refers to a low glucose level in cerebrospinal fluid. This can have significant diagnostic implications in various neurological conditions. A low CSF Gluc test can be seen in conditions such as purulent meningitis, which is an infection of the meninges that surround the brain and spinal cord.