Quantitative beta-HCG (serum assay)
Conduct this analysis
Blood draws at our service locations in Quebec. A healthcare professional can also review your results with you.
Two clinical contexts, the same dosage
The terminology "quantitative beta-HCG" is frequently used by patients and prescribers to refer to precise blood measurement of this hormone, as opposed to a rapid urine test. This measurement answers very different clinical questions depending on whether it is requested in the context of pregnancy or in an oncological context.
| Context | Objective of quantitative assay | Key parameter interpreted |
|---|---|---|
| Obstetrics (pregnancy) | Early pregnancy confirmation, estimated due date, monitoring of progression, detection of ectopic pregnancy or miscarriage | Doubling kinetics every 48 to 72 hours in early normal pregnancy; correlation with the ultrasound discriminative threshold |
| Oncologic (tumors) | Staging and monitoring treatment response for trophoblastic and germ cell tumors; detecting relapse after remission | Gradual decrease to complete negativity after treatment; any increase after normalization indicates a relapse. |
When to request a quantitative assay instead of a urine test
- Very early pregnancy suspicion, before the expected period date, when maximally sensitive detection is required
- Positive urine test with pelvic pain or bleeding: urgent evaluation to rule out ectopic pregnancy, requiring a numerical value correlable to the ultrasound discriminatory threshold.
- Pregnancy monitoring after medically assisted reproduction (IVF, insemination): the standard protocol requires a quantitative blood test on day 14 post-embryo transfer
- Follow-up after miscarriage or treatment of an ectopic pregnancy: monitoring until complete negativization confirming the absence of trophoblastic retention
- Post-hydatidiform mole treatment follow-up: weekly measurements until three consecutive negative values, then monthly for six to twelve months according to protocols
- Monitoring of testicular or ovarian germ cell tumors under chemotherapy: beta-HCG decline correlates directly with tumor response to treatment
- Initial germ cell tumor extension assessment: beta-HCG levels contribute to the International Germ Cell Cancer Collaborative Group (IGCCCG) prognostic classification
Consult at Clinique Omicron
Les médecins et infirmières praticiennes spécialisées (IPS) de Clinique Omicron peuvent prescrire un dosage quantitatif du beta-HCG sérique dans le cadre d'un suivi de début de grossesse, d'une investigation gynécologique urgente ou d'un suivi oncologique coordonné. Les résultats sont interprétés en contexte clinique et orientent vers l'échographie, la gynécologie ou l'oncologie selon les besoins. Prenez rendez-vous en ligne ou par téléphone à l'un des points de service de Clinique Omicron au Québec.
The content of this page is provided for informational purposes only and is not intended to replace the advice of a qualified healthcare professional. Consult a physician for any symptoms, questions or decisions you may have regarding your health.
Omicron Clinic
Need to consult a doctor?
In-person or via telemedicine, anywhere in Quebec.
We accept insurance. Telemedicine consultations available 7 days a week. No family doctor required.