What Is Beta-HCG?
Beta-HCG (beta human chorionic gonadotrophin) is a hormone produced by the placenta shortly after a fertilised egg implants in the uterine wall. It is the hormone detected by pregnancy tests - both urine-based home tests and blood tests. A blood test for beta-HCG is more sensitive than a urine test and can detect pregnancy earlier, typically 6–8 days after ovulation.
Beta-HCG levels rise rapidly in early pregnancy, roughly doubling every 48–72 hours during the first weeks. They peak at around 8–11 weeks of gestation and then gradually decline for the remainder of the pregnancy. The pattern of rise is clinically important - an abnormal doubling time can indicate ectopic pregnancy, miscarriage, or other complications.
Why Is Beta-HCG Tested?
- Confirm pregnancy earlier than a urine test can detect
- Monitor early pregnancy viability - serial measurements assess whether HCG is doubling appropriately
- Investigate suspected ectopic pregnancy (HCG rises more slowly than expected)
- Assess risk of miscarriage when HCG levels are falling or not doubling
- Screen for chromosomal abnormalities as part of first-trimester combined screening
- Detect and monitor gestational trophoblastic disease (molar pregnancy, choriocarcinoma)
- Monitor tumour markers - some non-pregnancy tumours produce HCG (testicular, ovarian)
Normal Ranges
Beta-HCG is measured in IU/L (international units per litre). Normal levels vary dramatically by gestational age:
| Weeks Since Last Menstrual Period | Expected HCG Range (IU/L) |
|---|---|
| 3 weeks | 5 – 50 |
| 4 weeks | 5 – 426 |
| 5 weeks | 18 – 7,340 |
| 6 weeks | 1,080 – 56,500 |
| 7–8 weeks | 7,650 – 229,000 |
| 9–12 weeks | 25,700 – 288,000 |
| 13–16 weeks | 13,300 – 254,000 |
| 17–24 weeks | 4,060 – 165,400 |
| 25–40 weeks | 3,640 – 117,000 |
| Non-pregnant | Below 5 |
There is enormous normal variation in HCG levels. A single value is less informative than the trend over 48–72 hours. Twin pregnancies typically have higher HCG levels.
Check Your Beta-HCG (Pregnancy) Levels at Home
The Core Health 45 includes Beta-HCG (Pregnancy) testing along with 44 other biomarkers. Results in 2 working days with a free at-home phlebotomist visit.
View Core Health 45 →What Do Abnormal Results Mean?
Higher Than Expected HCG
- Multiple pregnancy: Twins or higher-order multiples produce more HCG
- Molar pregnancy: Abnormal placental tissue produces very high HCG levels
- Incorrect dating: The pregnancy may be further along than estimated
- Down syndrome screening: Elevated HCG in the first trimester is one component of combined screening
Lower Than Expected or Slow-Rising HCG
- Ectopic pregnancy: HCG rises more slowly (often less than 53% in 48 hours)
- Threatened or inevitable miscarriage: Falling or plateauing HCG levels
- Blighted ovum: Gestational sac without embryo — HCG may rise slowly then plateau
- Incorrect dating: The pregnancy may be earlier than estimated
Understanding HCG Doubling Time
- In a healthy early pregnancy, HCG should increase by at least 53% every 48 hours
- At HCG levels below 1,200 IU/L, doubling time is typically 48–72 hours
- At HCG levels of 1,200–6,000 IU/L, doubling time is typically 72–96 hours
- Above 6,000 IU/L, the rate of rise slows significantly
- A single HCG value cannot determine pregnancy viability — always interpret the trend
When Should You Get Tested?
- You think you may be pregnant and want confirmation earlier than a urine test
- You have a positive home test and your GP wants to quantify HCG levels
- You are experiencing pain or bleeding in early pregnancy (possible ectopic)
- You have had previous ectopic pregnancies and need early monitoring
- You are undergoing fertility treatment and need precise HCG tracking
- You have had a molar pregnancy and require follow-up monitoring
Which Lola Health Tests Include Beta-HCG?
Beta-HCG is available as an add-on biomarker with Lola Health blood tests. Contact us for availability or browse our test range:
Check Your HCG Levels
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