Test the nasal drainage for glucose.
Nasal discharge typically contains 10 mg of glucose, thus it may be ruled out if the glucose test is negative. However, because to its high percentages of false positive and negative results based on the patients' other medical problems, it should only be used as a reference.
A common bedside diagnostic for identifying CSF leaks is the measurement of the glucose content of nasal discharge. Nasal discharge are used to moisten glucose oxidase sticks, and the color shift is measured against a calibrated scale to estimate the glucose concentration.
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