What medical procedure is typically performed to confirm meningitis diagnosis?

• A. Lumbar puncture
• B. CT scan
• C. X-ray
• D. MRSA culture

Answer: (A)

A lumbar puncture, also known as a spinal tap, is the standard medical procedure performed to confirm a diagnosis of meningitis. This procedure involves the extraction of cerebrospinal fluid (CSF) from the spinal canal, which allows for the analysis of the fluid to check for the presence of bacteria, viruses, or other pathogens, as well as to assess the biochemical and cellular composition of the CSF.

In cases of suspected meningitis, examining the CSF can reveal elevated white blood cell counts, changes in protein levels, and decreased glucose levels, all of which are pivotal indicators of infection or inflammation. Thus, a lumbar puncture is vital for accurately diagnosing the type of meningitis (bacterial, viral, or fungal) and guiding treatment decisions.

While a CT scan may be used to evaluate complications or rule out other conditions prior to a lumbar puncture, it does not provide the same diagnostic information as a CSF analysis. An X-ray is not relevant for diagnosing meningitis, as it does not visualize the brain or spinal cord in a way that helps with this condition. A MRSA culture is specific for identifying Methicillin-resistant Staphylococcus aureus infections and would not be used for diagnosing meningitis specifically.