Which statement is not associated with human chorionic gonadotropin?

Which statement is not associated with human chorionic gonadotropin?

• A. B subunit confers immunogenic specificity
• B. Used to confirm pregnancy
• C. Used as a tumor marker
• D. Found in hepatoma

Answer: (D)

Human chorionic gonadotropin is a heterodimeric glycoprotein with two parts: a common alpha subunit shared with other hormones (LH, FSH, TSH) and a distinct beta subunit that determines the hormone’s receptor binding and, importantly for testing, its immunologic identity. The beta subunit is what immunoassays target to detect hCG specifically, because the alpha subunit is not unique and could cross-react with related hormones. This specificity is why pregnancy tests work well: they detect the presence of the beta-subunit-containing hCG in serum or urine as early as the first weeks after conception. Beyond confirming pregnancy, hCG serves as a tumor marker for certain neoplasms. It is produced ectopically by some germ cell tumors and trophoblastic tumors, so measuring beta-hCG helps in diagnosis and monitoring of these conditions. The idea that hCG would be found in hepatocellular carcinoma is not part of the typical associations; hepatoma is not a standard source of hCG production, making that statement not applicable in the usual clinical context.

Human chorionic gonadotropin is a heterodimeric glycoprotein with two parts: a common alpha subunit shared with other hormones (LH, FSH, TSH) and a distinct beta subunit that determines the hormone’s receptor binding and, importantly for testing, its immunologic identity. The beta subunit is what immunoassays target to detect hCG specifically, because the alpha subunit is not unique and could cross-react with related hormones. This specificity is why pregnancy tests work well: they detect the presence of the beta-subunit-containing hCG in serum or urine as early as the first weeks after conception.

Beyond confirming pregnancy, hCG serves as a tumor marker for certain neoplasms. It is produced ectopically by some germ cell tumors and trophoblastic tumors, so measuring beta-hCG helps in diagnosis and monitoring of these conditions. The idea that hCG would be found in hepatocellular carcinoma is not part of the typical associations; hepatoma is not a standard source of hCG production, making that statement not applicable in the usual clinical context.