hCG Calculator
Compare two quantitative hCG blood-test results to calculate the percentage change, estimated doubling time, and equivalent 48-hour change.
Enter hCG test results
Result
Enter two hCG values and the time between tests to compare the results.
Compare serial tests
The direction and rate of change between multiple blood tests are generally more informative than a single isolated value.
Use the same units
Enter both results in mIU/mL. Results from different laboratories may use different methods or reference ranges.
Interpret with context
Gestational timing, ultrasound findings, symptoms, and clinical history all matter when reviewing hCG results.
Frequently asked questions
What does the hCG doubling time show?
It estimates how long the measured values would take to double if the same exponential rate continued. Real hCG change is not perfectly constant.
Can this calculator diagnose a healthy pregnancy?
No. It only compares two numbers mathematically and cannot diagnose pregnancy viability, miscarriage, or ectopic pregnancy.
What happens if the second hCG value is lower?
The calculator will show a decrease and will not provide a positive doubling time. A clinician should interpret the result in context.
Why is gestational age optional?
Gestational age is shown only as context in the calculation summary. It does not change the mathematical result.
This tool is for educational and informational purposes only and does not constitute medical advice, diagnosis or treatment. Always consult a qualified healthcare professional for clinical decisions. VisionVix accepts no liability for decisions made based on this tool's output.
