Beta hCG Level Checker (By Week)

Enter your beta hCG level and due date to see whether your result sits within the typical range for your current week (3–18). You’ll also get a simple chart for context and guidance on what your number may mean.

Reference band shown for weeks 3–18. hCG varies widely; trends across time are more informative than one result.

What this tool does

  • Takes a single quantitative serum beta hCG value (mIU/mL) and a due date (EDD).
  • Converts the EDD to a current gestational week, then compares your value with a broad “typical” reference band for that week.
  • Shows a simple note (within or outside the band) and plots your point against a shaded band on a small chart.

How gestational age is calculated

  • LMP from EDD: the tool sets last menstrual period (LMP) = EDD − 280 days (40 × 7).
  • Current GA (weeks): GA days = today − LMP (UTC day math to avoid time-zone drift), then GA weeks = ceil(GA days ÷ 7). This integer week is used for lookups.
  • Inputs yielding GA outside 3–18 weeks are rejected because the reference band in this tool only spans that interval.

Reference band and lookups

  • Weekly table: the code embeds a week-indexed table (weeks 3, 4, 5, 6, 7, 8, 9, 10, 12, 14–18) with a typical low–high range (mIU/mL) for each week.
  • Range check: for your computed GA week w, the tool fetches min[w] and max[w] and flags “within” if min[w] ≤ value ≤ max[w], otherwise “outside”.
  • Display rounding: numbers are formatted with thousands separators; ordinal week labels (e.g., 7th) are used for readability.

Chart rendering

  • Drawn with the HTML5 canvas API (no libraries). The shaded band is the polygon between the weekly min and max series.
  • The x-axis shows weeks; the y-axis shows hCG (mIU/mL). The y-limit expands if your value exceeds the band so your point is visible.
  • A small spinner overlays the chart area while the figure is redrawn to give responsive feedback.

Assumptions and guardrails

  • Dating model: EDD is assumed to reflect a standard 280-day gestation. If your EDD is ultrasound-based, the calculation still uses that EDD as the single source of truth.
  • Singleton reference: bands are intended for singleton pregnancies; multifetal gestations can show higher values.
  • Laboratory variability: different assays can yield different absolute values. The band is intentionally broad to reflect inter-individual variation.
  • Trends matter: serial change (e.g., 48–72 hour rise patterns early in pregnancy) is often more informative than a single value.
  • Scope limits: the checker is not a diagnostic tool for pregnancy location or viability. Clinical interpretation must consider symptoms, ultrasound, and serial labs.

Sources

Last updated: 16 Oct 2025

How to use this calculator

  1. Enter your beta hCG value (mIU/mL) from today’s blood test.
  2. Select your due date (EDD) so we can estimate your current gestational week.
  3. Click Calculate to see a pass/fail style headline and a chart with the typical range for your week.

Tip: hCG varies widely between pregnancies. If you have serial results, consider our hCG Doubling Time Calculator or the 48-Hour Change tool to track trend.

How to read your result & chart

  • Week alignment: We estimate your week from your EDD. If your dating is off (e.g., late ovulation), the “expected range” may look wrong even if the pregnancy is normal.
  • Wide normal ranges: Typical hCG spans are very broad. Being outside the band isn’t a diagnosis by itself.
  • Trend beats one value: A rising pattern over 48–72 hours is usually more informative than a single measurement.
  • Ultrasound takes over: From ~6–7 weeks onward, scan findings guide care more than blood levels.

If you’re tracking change, try: Doubling Time · 48-Hour Change · hCG by Week lookup.

hCG: Frequently asked questions

What is a “normal” beta hCG by week?

There isn’t one exact “normal”—ranges are broad and overlap. Use our hCG by Week lookup for a quick reference, and rely on trend + ultrasound for decision-making.

My value is outside the band—does that mean something is wrong?

Not necessarily. One value can be misleading due to dating differences, lab variation, or biologic spread. Serial testing (e.g., every 48–72h) is more informative—see the Doubling Time Calculator.

Does a higher hCG mean twins?

Twins can have higher levels, but many singletons also overlap with twin ranges. Ultrasound is the only reliable way to confirm multiples.

How fast should hCG rise?

In very early pregnancy, increases of roughly 35–66% over 48 hours are often cited, but viable pregnancies can rise slower. Track your own trend with the 48-Hour Change tool.

Why does the calculator ask for my due date?

We back-calculate your current week from the EDD (40 weeks from LMP). If your EDD is off, the week—and therefore the expected range—will be off too. Use your latest ultrasound-confirmed EDD if you have one.

When should I talk to a clinician?

Any concerning symptoms (e.g., significant pain, bleeding), persistently falling values, or discrepant results with your dates warrant medical review. From ~6–7 weeks, ultrasound becomes the key test.