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Open calculator → Early pregnancy
hCG Doubling Time Calculator
In early pregnancy, how fast beta-hCG rises matters more than any single number. Enter two blood results with their dates and times to see the doubling time and the percentage rise.
How to use it
- Enter the earlier result first, with the date and time the sample was taken.
- Enter the later result second. The two tests should be at least 48 hours apart to be meaningful — closer together and normal variation swamps the trend.
- Read the doubling time together with the "typical at this level" line, because expected doubling slows as hCG climbs.
How to read the number
- Below about 1,200 mIU/mL, hCG typically doubles every 48 to 72 hours. Between 1,200 and 6,000 it takes about 72 to 96 hours. Above 6,000 it slows further, often to 96 hours or more.
- A rise of at least 53% over 48 hours is the usual threshold quoted for a potentially viable intrauterine pregnancy — but a substantial minority of perfectly healthy pregnancies rise more slowly.
- A single value tells you very little. hCG levels at the same gestational age vary enormously between healthy pregnancies.
- This calculator cannot tell you whether a pregnancy is viable, ectopic or miscarrying. Only your doctor, using your results together with an ultrasound and your symptoms, can do that.
When to contact the hospital immediately
Call or come in straight away — do not wait for the next blood test — if you have severe or one-sided abdominal pain, heavy bleeding, shoulder-tip pain, dizziness or fainting. These can be signs of an ectopic pregnancy, which is a medical emergency. Slow-rising hCG together with pain always needs same-day assessment.
Frequently asked questions
What is a normal hCG doubling time?
In the first weeks, roughly 48 to 72 hours while levels are below about 1,200 mIU/mL. It naturally slows as the number rises, and after around 10 weeks of pregnancy hCG plateaus and then falls — which is entirely normal.
My hCG is rising slowly. Does that mean miscarriage?
Not necessarily. Slow rise raises concern about an ectopic or a non-viable pregnancy, but healthy pregnancies with slow early rises do occur. What settles the question is an ultrasound once the level is high enough to see a sac, usually around 1,500–2,000 mIU/mL, together with your symptoms.
Does a high hCG mean twins?
Higher levels are more common with twins, but the overlap with singleton pregnancies is so wide that hCG cannot diagnose a twin pregnancy. Only a scan can.
How soon after IVF is hCG tested?
Usually about 9 to 14 days after transfer, depending on the embryo day and your centre’s protocol. Testing earlier risks picking up residual hCG from a trigger injection and getting a misleading result.
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