HCG Doubling Time

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Track the progression of early pregnancy by measuring HCG level changes.

HCG Measurements

Initial HCG Level

mIU/mL

Second HCG Level

mIU/mL

Time Between Checks

Hours

Growth Analysis

Doubling Time38.0Hours

Growth StatusNormal Range140% total

Increase / 2 Days140.0%

Doubling in 1.58 days

About this calculator

Overview

HCG (Human Chorionic Gonadotropin) is the 'pregnancy hormone'. In early pregnancy, HCG levels typically double every 48 to 72 hours. Tracking the doubling time can help identify a potentially healthy pregnancy, although it is not a definitive diagnostic tool on its own.

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Pro Tips

Take measurements at the same lab if possible for consistent results.
HCG levels can vary widely between individuals; the trend is more important than the absolute number.
Always interpret HCG results in conjunction with an ultrasound after 6 weeks.

Fun Facts

"HCG levels usually peak around 8–11 weeks of pregnancy and then decline."
"A doubling time between 48 and 72 hours is generally considered normal in very early pregnancy."
"As HCG levels get higher, the doubling time naturally slows down."
"Slow-rising HCG can sometimes indicate an ectopic pregnancy or potential miscarriage."

Formula: Doubling Time (Days) = [t × ln(2)] / [ln(H2 / H1)], where t is the time elapsed.