HCG (Human Chorionic Gonadotropin) is made up of two subunits: alpha (α), which is common to other hormones like LH, FSH, and TSH, and beta (β), which is unique to HCG. β-HCG is an essential hormone in early pregnancy in clinical practice. It is produced by placental trophoblast cells after fertilisation and serves as a key biomarker for confirming pregnancy and diagnosing various conditions. . One of its primary functions is to maintain the corpus luteum, ensuring continued progesterone production to support the uterine lining. It also aids foetal development until the placenta assumes hormone production around the 10th week of gestation.
Clinical Uses
- A urine β-HCG test is commonly used for at-home pregnancy detection and becomes positive around 10–14 days after conception.
- The serum β-HCG test is more sensitive and quantitative and is used clinically to confirm and monitor early pregnancy.
- Abnormal trends of β-HCG may suggest conditions such as ectopic pregnancy, miscarriage, or molar pregnancy.
- Elevated β-HCG levels can also act as a tumour marker for certain cancers, including choriocarcinoma, testicular cancer, and ovarian germ cell tumours.
- Post-abortion or post-molar pregnancy monitoring involves tracking β-HCG levels until they return to baseline to confirm resolution and rule out malignancy.
Different Diagnostic ways to test for β-HCG levels
Commonly used methods for detecting β-HCG levels in laboratories include electrochemiluminescence immunoassay (ECLIA), Chemiluminescence Immunoassay (CLIA), and enzyme-linked immunosorbent assay (ELISA).
These immunoassays are designed for quantitative in vitro detection of β-HCG in human serum or plasma.
The normal range of β-HCG varies based on factors such as pregnancy stage, age, and overall health. In early pregnancy, levels usually double every 48 to 72 hours, while in non-pregnant individuals, they are typically below 5 mIU/ml.
Conclusion
β-HCG plays a crucial role in pregnancy and in reproductive health & Oncology. Accurate interpretation of its levels requires correlation with clinical findings and imaging studies. It is highly specific for the detection of early pregnancy, its monitoring, as well as for assessing and managing certain tumours.
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