Home / Calculators / Early pregnancy / Beta hCG doubling
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A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
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These tools provide general information and are not a diagnosis or a substitute for assessment by a qualified clinician. Reference ranges and sources are stated on each calculator. Predictive estimates describe groups of people and cannot predict an individual outcome.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
Doubling time and rate of rise, against published reference points. No verdict — none is possible.
Exact calculationArithmetic on the numbers you enter. If your inputs are right, this figure is right.
A single hCG value means very little. What matters is the rate of change between two tests taken 48 hours apart, expressed as a doubling time.
Source — Doubling time calculated from the two values and the interval you enter. In early viable pregnancy hCG typically rises at least 35 to 53 per cent over 48 hours, and the rate slows as levels rise. An ultrasound is usually informative once hCG passes roughly 1,500 to 2,000 mIU/mL. This tool does not diagnose anything.
The bands on this page are drawn from published sources but have not yet been reviewed by our medical team, and some vary by laboratory or assay. Check against the reference range printed on your own report.
The earlier test
The later test
Usually 48
That falls in the under 48 hours band.
Your result of 44.8 hours to double sits in the highlighted band. Bands are reference points used alongside clinical findings — not a diagnosis.
A rise at this rate is reassuring in early pregnancy. Doubling slows naturally as levels climb above roughly 1,200 to 6,000 mIU/mL, so a longer time later on is expected rather than concerning.
Doubling time calculated from the two values and the interval you enter. In early viable pregnancy hCG typically rises at least 35 to 53 per cent over 48 hours, and the rate slows as levels rise. An ultrasound is usually informative once hCG passes roughly 1,500 to 2,000 mIU/mL. This tool does not diagnose anything.
Highlighted is the stage this measurement belongs to. It is a map of the process, not a schedule — timings vary by protocol and by clinic.
Very little. The normal range at any point in early pregnancy is extremely wide. The change between two tests taken 48 hours apart carries nearly all the information.
Not necessarily. Slow rises occur in pregnancies that continue normally, and the rate naturally slows as levels climb. It does need clinical review, because ectopic pregnancy also presents this way.
No. Levels overlap far too much between singleton and multiple pregnancies for any threshold to be meaningful. Ultrasound answers this.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
The rate of change between two tests carries the information, not either value alone. Nothing here is a diagnosis or a substitute for assessment by a clinician.
A calculator gives you a number. These explain what it means, and what it does not.
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