Hcg Doubling Time Calculator
Calculate the doubling time of hCG levels to monitor early pregnancy progression. Enter two hCG test results and the hours between them.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator estimates the doubling time of human chorionic gonadotropin (hCG) based on two blood test results and the time between them.
- Enter the first hCG level (in mIU/mL) from your initial blood test.
- Enter the second hCG level (in mIU/mL) from your follow-up test.
- Enter the exact number of hours between the two blood draws.
- Click “Calculate” or press Enter.
The result shows the doubling time in hours and a brief interpretation:
- Less than 31 hours – typical for early pregnancy.
- 31–72 hours – within normal range.
- Over 72 hours – longer than typical; consult a healthcare provider.
Note: The second hCG level must be higher than the first for a valid calculation. All inputs must be positive numbers.
Previous Results
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Frequently Asked Questions
hCG doubling time is the number of hours it takes for the level of human chorionic gonadotropin (hCG) to double in early pregnancy. It is used to monitor the health and progression of pregnancy.
In early pregnancy, hCG levels typically double every 48 to 72 hours. A doubling time of less than 31 hours is often seen in very early pregnancy, while 31-72 hours is considered normal.
Abnormal doubling times may indicate potential issues such as ectopic pregnancy or miscarriage. Always consult a healthcare provider for interpretation of your results.
