What is βhCG doubling time and how should I interpret it?

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Accepted Answer

βhCG (beta human chorionic gonadotropin) is the pregnancy hormone produced by the placenta after implantation. Before about 6 weeks of pregnancy, βhCG typically doubles every 48–72 hours. This doubling time is a reference indicator of whether the pregnancy is progressing as expected. The calculator uses two values and their timestamps with the formula doubling time = ΔT × ln2 / ln(v2/v1). Doubling can be faster or slower than 48–72 hours in a healthy pregnancy, and a value in range does not rule out a problem. Conditions like ectopic pregnancy or miscarriage are diagnosed by an obstetrician using ultrasound and other findings. This site is not a diagnostic tool.