Beta-Trace Protein (βTP) is a low-molecular-weight protein biomarker found in cerebrospinal fluid (CSF) and urine. Abnormal CSF leakage shows elevated βTP levels in fluids outside the central nervous system. The test is important for healthcare providers in assessing CSF-related disorders, such as CSF rhinorrhea or otorrhea, to determine the source of CSF leakage and provide comprehensive management.