Luteal Phase Calculator

Calculate Luteal Phase Length



Formula

The formula to calculate the length of the luteal phase is:

\[ LP = CD - O \]

Where:

What is a Luteal Phase?

The luteal phase is a stage in a woman’s menstrual cycle that occurs after ovulation and before the start of her period. It typically lasts about two weeks, during which the body prepares for a possible pregnancy. The corpus luteum, a structure that develops in the ovaries after an egg has been released, produces progesterone to thicken the lining of the uterus. If fertilization does not occur, the corpus luteum breaks down, progesterone levels drop, and menstrual bleeding begins, marking the start of a new cycle.

Example Calculation

Let's assume the following values:

Using the formula:

\[ LP = 28 - 14 = 14 \text{ days} \]

The Luteal Phase Length (LP) is 14 days.