hCG Range by Gestational Age: Lookup and Compare

Enter weeks+days or DPO to see a typical hCG band for that stage. Add your result to compare against the band.

How do you want to enter progress?
GA = gestational age from last period. DPO = days past ovulation (we add 14 days to map to GA).
Weeks
Days (0–6)
Your hCG (IU/L) (optional)
Add your value to see “below / within / above typical”.
Advanced: hCG Doubling
Reference band: —
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These are broad reference ranges; individual results vary a lot. Use with a clinician.

What this tool shows

  • A coarse reference band for serum hCG by gestational age in weeks.
  • An optional comparison of a user value as below, within, or above that band.
  • An alternate input mode using DPO. The tool maps DPO to GA by adding 14 days, mirroring obstetric dating from last menstrual period.

Reference bands

  • Bands are broad and match widely used public reference intervals expressed in IU/L.
  • Bands widen with increasing GA and overlap between weeks. Lab methods and populations differ, so a single value cannot date a pregnancy on its own.

Scope and limits

  • Use for early pregnancy context only. Trends and ultrasound guide clinical decisions.
  • Multiple gestation, assisted reproduction timing, and uncertain dates can shift expected values.
  • Educational tool only. Does not replace care from a clinician.

Sources

  • Mount Sinai Health Library. hCG blood test, quantitative. Week based reference intervals. mountsinai.org
  • Healthdirect Australia. hCG levels. Variability, trends, and clinical use context. healthdirect.gov.au

Last updated: 6 Oct 2025

How to use this calculator

  1. Select input mode: choose weeks+days or enter DPO. DPO maps to GA by adding 14 days.
  2. Enter your stage: type weeks and days, or a DPO value within the shown limits.
  3. Optional value: add your serum hCG to see a below/within/above comparison.
  4. Press Lookup: view the reference band in IU/L for that stage.
  5. Need trends: use the hCG Doubling Time calculator for multi-draw change.

Ranges are broad and vary by assay. Use the same lab for follow-up when possible.

Last updated: October 2025

Frequently asked questions

Where do the reference bands come from?

They are coarse public ranges grouped by gestational weeks. Exact numbers vary between labs and sources. Use them for orientation only.

Does a high or low hCG mean twins or a problem?

No. Single values overlap widely between pregnancies. Diagnosis needs trends, timing, symptoms, and ultrasound.

Why use DPO?

DPO aligns results to ovulation-based timing. The tool adds 14 days to map DPO to gestational age for comparison to week-based bands.

When do hCG levels peak?

Levels usually peak around 8–11 weeks GA and then decline. A falling value after the first trimester can be normal.

How should I track change over time?

Use serial testing with the same lab when possible and consider the Doubling Time calculator for trend context.