Which statement correctly describes CSF leakage from the ear?

Which statement correctly describes CSF leakage from the ear?

• A. If drainage tests positive for glucose, it indicates CSF leakage
• B. If drainage tests negative for glucose, it indicates CSF leakage
• C. Glucose presence has no relation to CSF leakage
• D. Glucose testing is not used

Answer: (A)

CSF contains glucose, so when drainage from the ear tests positive for glucose, it strongly suggests that the fluid is CSF rather than typical ear discharge from infection or other sources. This makes a positive glucose test a useful clue pointing toward a CSF leak. Keep in mind, though, that this test isn’t perfect. Other factors can affect results, and CSF glucose levels depend on serum glucose. Modern confirmation uses more specific markers like β2-transferrin. A negative glucose result does not completely rule out a CSF leak, and glucose testing isn’t the sole criterion.

CSF contains glucose, so when drainage from the ear tests positive for glucose, it strongly suggests that the fluid is CSF rather than typical ear discharge from infection or other sources. This makes a positive glucose test a useful clue pointing toward a CSF leak.

Keep in mind, though, that this test isn’t perfect. Other factors can affect results, and CSF glucose levels depend on serum glucose. Modern confirmation uses more specific markers like β2-transferrin. A negative glucose result does not completely rule out a CSF leak, and glucose testing isn’t the sole criterion.