حمل ٹیسٹ دبئی — Beta-HCG خون ٹیسٹ

Human chorionic gonadotropin (HCG) is a glycoprotein hormone composed of alpha and beta subunits. The beta subunit is unique to HCG and is the target measured in pregnancy blood tests, as it does not cross-react with other pituitary hormones such as LH, FSH, and TSH that share the same alpha subunit. After fertilisation, HCG is produced first by the fertilised egg itself and then increasingly by the trophoblast cells that form the early placenta. Its primary role in early pregnancy is to signal the corpus luteum in the ovary to continue producing progesterone, maintaining the uterine lining and preventing menstruation until the placenta matures enough to produce progesterone independently at around 8 to 10 weeks.

Serial quantitative beta-HCG measurement is the most valuable clinical tool in early pregnancy surveillance. The established pattern of doubling every 48 to 72 hours serves as a benchmark against which actual measurements are compared to identify normal versus abnormal progression. When combined with transvaginal ultrasound, which can visualise the gestational sac from approximately 4.5 to 5 weeks and the embryonic heartbeat from 5.5 to 6 weeks, serial HCG provides a comprehensive picture of early pregnancy health. Understanding that HCG reference ranges overlap broadly between normal and abnormal pregnancies underscores why trend analysis over serial measurements is always more informative than any single value in isolation.