CSF analysis in meningitis typically includes which of the following?

CSF analysis in meningitis typically includes which of the following?

• A. Electroencephalography
• B. Skin biopsy
• C. Gram stain and cultures; PCR for DNA
• D. Imaging only

Answer: (C)

In meningitis, the goal of CSF analysis is to rapidly identify the causative organism so treatment can be targeted. The combination of Gram stain and cultures provides immediate, practical clues about bacteria and then confirms the organism with a grow-out and allows antibiotic susceptibility testing. PCR for DNA adds high sensitivity and speed, picking up pathogen DNA even when patients have already received antibiotics or when organisms are difficult to culture; it also helps detect viral pathogens when bacterial tests are negative. Together, Gram stain, culture, and PCR for DNA give the most reliable etiologic identification from CSF. Imaging and electroencephalography aren’t part of CSF analysis themselves, and skin biopsy isn’t relevant to diagnosing meningitis. Imaging may be used to assess complications or rule out other causes, but it doesn’t identify the causative organism from CSF.

In meningitis, the goal of CSF analysis is to rapidly identify the causative organism so treatment can be targeted. The combination of Gram stain and cultures provides immediate, practical clues about bacteria and then confirms the organism with a grow-out and allows antibiotic susceptibility testing. PCR for DNA adds high sensitivity and speed, picking up pathogen DNA even when patients have already received antibiotics or when organisms are difficult to culture; it also helps detect viral pathogens when bacterial tests are negative. Together, Gram stain, culture, and PCR for DNA give the most reliable etiologic identification from CSF.

Imaging and electroencephalography aren’t part of CSF analysis themselves, and skin biopsy isn’t relevant to diagnosing meningitis. Imaging may be used to assess complications or rule out other causes, but it doesn’t identify the causative organism from CSF.