What are normal hCG levels by week?

Ranges are wide and depend on gestational age: e.g. about 5–426 at 4 weeks, 1,080–56,500 at 6 weeks, 25,700–288,000 at 9–12 weeks mIU / mL. Your lab states the exact reference. Enter the week and the calculator shows a guide and checks your value.

How fast should hCG rise?

In an early normal pregnancy hCG usually rises by at least ~50–60% over 48 hours and doubles roughly every 48–72 hours. Enter two measurements and the interval in the “Dynamics” block to get the doubling time and the 48-hour rise.

hCG is not rising or is falling — what does it mean?

A slow rise, plateau or fall in early pregnancy needs monitoring: it happens with ectopic or non-viable pregnancy. But it is not a diagnosis — it is assessed over time together with ultrasound. With pain or bleeding, see a doctor urgently.

Count the week from conception or from the period?

From the first day of the last period (gestational age) — that is how all hCG norms are defined. The age from conception is about 2 weeks less.

hCG above the norm for the week — is that bad?

Not necessarily. High hCG occurs with a multiple pregnancy or when the true date is later than expected. It is assessed together with ultrasound; one high value is not itself a problem.

hCG by week: norms and calculator

Enter the gestational week (from your last period) — the calculator shows the approximate β-hCG norm and checks your value against it. In the “Dynamics” block, two measurements give the doubling time and the 48-hour rise — in early pregnancy that matters more than a single number. Ranges are wide and differ between labs, so this is a guide, not a diagnosis.

Check hCG by week and its dynamics

Enter the gestational week (from the last period) — we’ll show the norm range.

hCG norms by week of pregnancy (mIU / mL)

Approximate serum β-hCG ranges by gestational age (from the first day of the last period). Ranges are very wide and differ between labs — always check your own lab’s reference.

Gestational week	β-hCG, mIU / mL
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

What hCG is and why it is measured

hCG (human chorionic gonadotropin) is a hormone made by the developing placenta. It appears in blood soon after the embryo implants and rises rapidly in the first weeks, so hCG confirms pregnancy and tracks its early development.

Blood measures β-hCG (mIU / mL) — more precise than a urine strip. The level depends on gestational age, so it is always read together with the week.

How to read the norm by week

The week is gestational — counted from the first day of the last period, not from conception. The normal ranges are very wide: at 6 weeks it is thousands, and by 9–12 weeks hundreds of thousands of mIU / mL.

Because of this width, a single value says little on its own: it can look “off” simply due to an imprecise date or lab differences. So the ultrasound dating and the trend are considered too.

Dynamics matter more than a single value

In an early, normally developing intrauterine pregnancy, hCG usually rises by at least ~50–60% over 48 hours (roughly doubling every 48–72 hours). So two measurements a couple of days apart are more informative than one.

Slow rise, a plateau or a fall is a reason to monitor (it happens with ectopic or non-viable pregnancy), but it is not a diagnosis: the doctor and ultrasound decide, not the number alone.

When a value is “off”

A value above the week’s range can occur with a multiple pregnancy or an earlier true date; below it, with late ovulation, an imprecise date or a very early stage. Often this is a normal variant.

What matters is not one-off deviations but the wrong trend together with ultrasound and symptoms. A doctor makes the assessment.

A guide, not a diagnosis

The calculator helps you understand your result and prepare to talk to your doctor. It does not replace follow-up, ultrasound and examination — especially with pain, bleeding or a worrying trend, where you should see a doctor without delay.

Frequently asked questions

Ranges are wide and depend on gestational age: e.g. about 5–426 at 4 weeks, 1,080–56,500 at 6 weeks, 25,700–288,000 at 9–12 weeks mIU / mL. Your lab states the exact reference. Enter the week and the calculator shows a guide and checks your value.
In an early normal pregnancy hCG usually rises by at least ~50–60% over 48 hours and doubles roughly every 48–72 hours. Enter two measurements and the interval in the “Dynamics” block to get the doubling time and the 48-hour rise.
A slow rise, plateau or fall in early pregnancy needs monitoring: it happens with ectopic or non-viable pregnancy. But it is not a diagnosis — it is assessed over time together with ultrasound. With pain or bleeding, see a doctor urgently.
From the first day of the last period (gestational age) — that is how all hCG norms are defined. The age from conception is about 2 weeks less.
Not necessarily. High hCG occurs with a multiple pregnancy or when the true date is later than expected. It is assessed together with ultrasound; one high value is not itself a problem.

hCG is a value from your blood test

Upload your report — AI reads hCG and other values together, links them to gestational age and explains what to do next.

Decode my lab results

This calculator is for reference and information only and is not a diagnosis. Pregnancy is assessed by a doctor and ultrasound; with pain or bleeding, see a doctor immediately.