The nurse cares for a patient who is suspected of having bacterial meningitis. The patient's family asks the nurse how will the diagnosis be confirmed. How should the nurse reply?

A. "An MRI will show adhesions impairing the outflow of cerebral spinal fluid (CSF).": MRI may reveal complications such as hydrocephalus or meningeal inflammation but cannot definitively diagnose bacterial meningitis. Adhesions are not a typical finding used to confirm the infection. B. "The lumbar puncture results will show cerebral spinal fluid (CSF) that is cloudy in appearance with raised neutrophils.": Bacterial meningitis is confirmed by analysis of CSF obtained via lumbar puncture. Cloudy CSF indicates high protein content and cellular debris, while a predominance of neutrophils (polymorphonuclear leukocytes) reflects an acute bacterial inflammatory response. CSF glucose is often low and protein elevated, supporting the diagnosis. C. "The lumbar puncture results will show cerebral spinal fluid (CSF) that has a normal appearance with raised lymphocytes.": Normal-appearing CSF with elevated lymphocytes is more consistent with viral (aseptic) meningitis, not bacterial. This finding would not confirm bacterial infection and could mislead diagnosis and treatment. D. "An MRI will identify meninges thickening.": MRI may show meningeal enhancement in meningitis, but it is nonspecific and cannot distinguish bacterial from viral causes. Definitive diagnosis relies on CSF analysis rather than imaging findings.