A member asked:

Doctors post said that 634 hcg level is possible just 3-4 days after sex, but then said it would take about 10 days to reach a level of 25. how?

A doctor has provided 1 answer

Need clarification: You're right ... The math isn't adding up. You could not have a level of 634 only 3-4 days after conception. The general rule of thumb is that you can start to test HCG blood levels as early as 10 days after conception. And, that HCG levels double every 48 hours. Neither of those statements is concrete, just general rules. The dr may have meant 25, 000. Ask to have your levels tested again.

Answered 6/10/2014

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