A biochemistry test that quantitatively measures the beta human chorionic gonadotropin (β-hCG) hormone released from the placenta in blood; used for early pregnancy diagnosis, pregnancy monitoring, and serial level tracking at 48-hour intervals in suspected miscarriage and ectopic pregnancy.
Indication
- Early diagnosis in cases of missed period or suspected pregnancy
- Pregnancy follow-up after IVF (in vitro fertilization) and assisted reproductive treatment
- Threatened miscarriage and confirmation of complete evacuation of pregnancy tissue after miscarriage
- Serial measurement at 48-hour intervals in suspected ectopic (extrauterine) pregnancy
- Diagnosis and follow-up of molar pregnancy (gestational trophoblastic disease)
- Diagnosis and follow-up of certain germ cell tumors (testicular and ovarian origin)
- Monitoring beta-hCG normalization after surgical or medical treatment
Preparation
- Fasting is not required for the test
- Medications and hormonal treatments in use (especially those containing hCG) should be reported
- Last menstrual period date and the duration of suspected pregnancy are noted
- If a urine test was performed beforehand, the result is conveyed to the physician
- After hCG injection in IVF treatment, at least 10-14 days should pass to avoid false positives
How it's performed
- A routine venous blood sample is taken from the arm
- The sample is centrifuged in the laboratory to obtain serum
- β-hCG is measured quantitatively using immunoassay methods (ECLIA, CLIA)
- The result is reported in mIU/mL; gestational week estimates are interpreted with reference ranges
- Results can be provided the same day; in suspected ectopic pregnancy, repeat testing is planned every 48 hours
- The result is evaluated by the physician together with clinical findings and ultrasonography
Post-procedure
- In normal early pregnancy, beta-hCG approximately doubles every 48 hours
- In low or insufficient increase, ectopic pregnancy or threatened miscarriage is investigated
- Serial measurements are used to monitor normalization after treatment
- Weekly to monthly follow-up protocols apply in gestational trophoblastic disease
- A beta-hCG threshold of approximately 1500-2000 mIU/mL is important for visualization of the intrauterine gestational sac on ultrasound
Risks
- Mild bruising, pain and rarely fainting due to blood draw
- False negative result very early (pregnancy exists but the hormone is not yet at a detectable level)
- False positive results due to heterophile antibodies or some tumors
- The need for combined evaluation with clinical findings and ultrasound to avoid interpretation errors
- A single value cannot rule out ectopic pregnancy; serial follow-up is required
FAQ
What is the difference between beta-hCG and a urine pregnancy test?
A urine test only provides a positive/negative result and turns positive relatively later. Blood beta-hCG provides a numerical value, becomes positive earlier, and can be used for follow-up.
How long does it take for my result?
In most laboratories, results are available the same day, usually within a few hours. In emergencies, the turnaround time may be shorter.
If my beta-hCG value is low, does it mean my pregnancy is problematic?
A single low value does not always indicate a problem; it may be consistent with the gestational week. What matters is the rate of increase between two measurements 48 hours apart. In insufficient increase, the physician plans further evaluation.
When does beta-hCG become negative?
After miscarriage, curettage or treatment of ectopic pregnancy, it usually becomes negative within 4-6 weeks. In molar pregnancy, follow-up may take months. Complete normalization is important before attempting a new pregnancy.
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