hCG — The Pregnancy Hormone (and So Much Earlier Than a Stick)
That two-line home test? It's detecting hCG. But a blood test does it earlier, more precisely, and with numbers you can track over time. hCG is produced by the placenta after implantation and rises rapidly in early pregnancy. This test confirms pregnancy sooner than urine strips can, gives an indication of how the pregnancy is developing, and is essential for IVF follow-up.
Why Test hCG?
hCG blood testing is used to confirm pregnancy at the earliest possible stage, as part of IVF treatment follow-up (many clinics require it after miscarriage and before starting IVF), and when there are concerns about miscarriage — often alongside progesterone testing.
What Do High hCG Levels Mean?
A positive hCG means pregnancy is very likely. In normal early pregnancy, hCG doubles every 2 days for the first 4 weeks, slowing to every 3.5 days by week 6. Unusually high levels may indicate twins or, rarely, gestational trophoblastic disease.
What Do Low hCG Levels Mean?
A negative hCG means pregnancy is unlikely — but if you tested very early, it can't be completely ruled out. Slower-than-expected doubling or falling hCG may indicate a failing pregnancy, ectopic pregnancy, or miscarriage. After miscarriage, hCG should drop rapidly to undetectable levels.
Symptoms to Watch For
- Missed period
- Nausea or morning sickness
- Breast tenderness
- Fatigue
- Vaginal bleeding or spotting (possible miscarriage)
- Abdominal pain (possible ectopic pregnancy)
Who Should Get Tested?
- Women who think they might be pregnant
- Those undergoing IVF treatment
- Women with suspected miscarriage or ectopic pregnancy
- Anyone who needs early pregnancy confirmation
How to Prepare for Your Test
No preparation needed. Skip exercise before the test, as it may affect results. Bring valid ID. If you take a supplement containing biotin (often sold for hair and nails), pause it for two days before the test, as high doses can distort the result.
Order Your Blood Test
Test your hCG levels with an accredited Swedish laboratory. Results within days, reviewed by Wellth.
Frequently Asked Questions
How early can hCG detect pregnancy?
What does it mean if hCG isn't doubling?
Can hCG be elevated in non-pregnant women?
Reviewed by
Wellth Team
Wellth
Our content is written and reviewed by Wellth, and fact-checked against peer-reviewed research and current Swedish clinical guidelines.
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The information on this page is provided for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment. Wellth provides health information and testing services but is not a substitute for clinical care. Always consult a qualified healthcare provider if you have questions about a medical condition. If you are experiencing severe or urgent symptoms, contact your doctor or call 1177 Vårdguiden. Blood test results should be interpreted by a qualified healthcare professional in the context of your complete medical history.