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As an aid in the diagnosis of brain metastases of testicular cancer or extragonadal intracerebral germ cell tumors
Measurement of human chorionic gonadotropin (hCG) is used as an adjunct in the diagnosis of central nervous system metastases or recurrence of tumor in patients with germ cell tumors.
Quantitation of the hCG in cerebrospinal fluid (CSF) can be important in guiding treatment and monitoring response to treatment of these tumors.
Measurement of hCG in spinal fluid should not be the only parameter used to determine the presence of central nervous system metastases in patients with germ cell tumors.