hCG Levels Calculator: Doubling Time and Reference Ranges

Your details

Choose whether to calculate doubling time from two results, or compare one result to the weekly range.
The beta-hCG value from your first blood draw.
mIU/mL
The beta-hCG value from your second blood draw, taken after the first.
mIU/mL
The number of hours between the first and second blood test.
hours
Doubling timeNormal doubling
45.8hours

Time for hCG to double at the observed rate

Change in 48 hours106.7%
Projected hCG at 48 h310mIU/mL
45.8 hours
Normal (under 1,200)<72Acceptable (1,200-6,000)72-96Slow rise96+

Doubling time: 45.8 hours - Normal rise.

  • Your hCG rose from 150 to 310 mIU/mL over 48 hours.
  • Projected level 48 hours from your first draw: ~310 mIU/mL (+107%).
  • Normal doubling for early hCG (under 1,200 mIU/mL) is within 30-72 hours.
  • A single doubling time is only one data point. Serial measurements and clinical context matter more than any individual result.

Next stepDiscuss your serial hCG results with your healthcare provider, especially if levels plateau or fall. After 6-7 weeks, a fetal heartbeat on ultrasound is the best viability indicator.

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