Within the first 2-4 weeks after fertilization, hCG usually doubles every 48-72 hours
An increase of 60% in 48 hours is still considered normal
Below 1,200 mIU/ml, hCG usually doubles every 48-72 hours
Between 1,200 and 6,000 mIU/ml serum, the hCG usually takes 72-96 hours to double
Above 6,000 mIU/ml, the hCG often takes over four days to double
More than two in three normal pregnancies have a doubling of the hCG every 72 hours
There is a wide variation of normal hCG levels. An hCG that does not double every two to three days does not necessarily indicate a problem
A maximum level is usually reached by the 10th or 11th week.
After 10 weeks or so, hCG normally decreases
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