The authors describe a patient with a persistently elevated level of human chorionic gonadotropin (hCG) during chemotherapy for suspected low-risk, metastatic nonseminomatous germ cell tumor. His hCG level was found to have been falsely elevated owing to the presence of heterophile antibodies that interfered with the hCG immunoassay.
- David J. Gallagher
- Jamie Riches
- Dean F. Bajorin