Webnov 22, 2010 · my levels were more than doubling every 48 hours, but since they hit 1200 they have doubled approximately every 72 hours. They were 750 on monday, 1450 on wednesday and 2049 on thursday (one day later). Webjul 25, 2020 · hcg begins to be produced around the time of implantation and enters maternal circulation. 5% of women have detectable hcg levels right after implantation. If that's true then i'm still double a faster than… Webmar 30, 2024 · once the level reaches 1200 miu/l, beta hcg doubling time can reduce slightly and take approximately 3. 5 days. The doubling time for hcg can also take. Webyou can use the calculator below to calculate the doubling time of two beta hcg samples by entering the date of the blood test and the corresponding beta hcg value for that day.