HCG Doubling Time Calculator

Calculate HCG Doubling Time







Formula

To calculate the HCG doubling time:

\[ DT = \frac{t_2 - t_1}{\log_2 \left(\frac{HCG_2}{HCG_1}\right)} \]

Where:

HCG Doubling Definition

HCG doubling refers to the process where the levels of the hormone human chorionic gonadotropin (HCG) double approximately every 48 to 72 hours during the early stages of pregnancy. This hormone is produced by the placenta after implantation, and its rapid increase is often used as an early indicator of pregnancy. The rate of HCG doubling can be used to estimate the age of the fetus and monitor the health of the pregnancy. A slower rate of doubling may indicate potential issues such as miscarriage or ectopic pregnancy.

Example Calculation 1

Let's assume the following values:

Using the formula:

\[ DT = \frac{48 - 0}{\log_2 \left(\frac{400}{100}\right)} = \frac{48}{\log_2 (4)} = \frac{48}{2} = 24 \text{ hours} \]

The HCG doubling time is 24 hours.

Example Calculation 2

Let's assume the following values:

Using the formula:

\[ DT = \frac{72 - 24}{\log_2 \left(\frac{600}{150}\right)} = \frac{48}{\log_2 (4)} = \frac{48}{2} = 24 \text{ hours} \]

The HCG doubling time is 24 hours.