Free beta-hCG
Human chorionic gonadotropin (hCG) belongs to the glycoprotein hormone family and is composed of two non-covalently associated subunits a and b. Determination of free-beta subunit alone or in combination with total hCG determination may improve diagnostics of non-seminomatous germ cell tumors, - choriocarcinomas, hydatiform moles, seminomas, and may help in discrimination between malignant and benign trophoblastic tumors.