Beta HCG

Function

Human Chorionic Gonadotropin (hCG) is a glycoprotein hormone produced by the trophoblastic cells of the placenta shortly after implantation. Its primary function is to maintain the corpus luteum, ensuring the continued production of progesterone, which is vital for maintaining the uterine lining during early pregnancy. In a normal pregnancy, Beta-hCG levels double approximately every 48 to 72 hours during the first trimester.

Why it is Ordered

This test is primarily ordered to confirm pregnancy and estimate gestational age. However, it serves several other critical diagnostic purposes:

• Ectopic Pregnancy Screening: Slow-rising levels may indicate a pregnancy located outside the uterus.
• Miscarriage Monitoring: Dropping levels can suggest a non-viable pregnancy.
• Tumor Marker: In non-pregnant individuals (including men), elevated Beta-hCG can indicate germ cell tumors of the ovaries or testes, or gestational trophoblastic disease (molar pregnancy).
• Prenatal Screening: It is used as part of the 'triple' or 'quad' screen to assess the risk of chromosomal abnormalities like Down Syndrome.

Associated Conditions

• Molar Pregnancy: Extremely high levels often indicate a hydatidiform mole.
• Multiple Gestation: Twins or triplets typically result in higher-than-average hCG levels.
• Germ Cell Tumors: Choriocarcinoma or testicular cancer can produce measurable hCG.
• Ovarian Cysts: Occasionally associated with slightly elevated levels in rare syndromes.