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Fertility Guide

Life Span of Ovum: How Long an Egg Lives After Ovulation

Medically reviewed by - Dr. Rekha Brar​ |
Updated 19 October 2026 |
2 min Read
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The life span of an ovum, also called egg, is an important factor to consider when trying to understand a woman’s fertility. It is because the life span of an ovum also influences the chances of getting pregnant. After ovulation, when a mature egg is released from the ovary, it is capable of fertilisation for a limited time. An egg typically survives for around 12–24 hours after ovulation. Knowing the timeline of how long an egg survives after ovulation can help couples understand their fertility window and plan intercourse accordingly for conception.

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What Is the Life Span of an Ovum?

The life span of an ovum is generally around 12–24 hours after ovulation. During this time, the egg travels through the fallopian tube, where fertilisation may occur if viable sperm are present. Once released, the egg does not remain viable indefinitely. If fertilization does not occur during this time, the eggs begin to break down and are eventually absorbed by the body. The menstrual cycle then continues, and if the pregnancy is not confirmed, the period usually comes.

How Long Does an Egg Live After Ovulation?

After ovulation, a mature egg is usually ready for fertilisation in about 12-24 hours. This short period is often called the fertilisation life of the egg. Here is what happens after ovulation:

Egg Release

As we know that during ovulation, a mature egg is released from one of the ovaries and enters the fallopian tube. This usually occurs once during each menstrual cycle and marks the beginning of the egg’s limited fertile period.

Movement Through the Fallopian Tubes

After release, the egg moves through the fallopian tube to the uterus. During this period, if sexual intercourse happens when the fertility window is open, then this egg may meet a sperm.

Fertilisation

Fertilisation occurs when viable sperm reaches and penetrates the egg (usually in the fallopian tube). Eggs can typically be fertilised around 12-24 hours after ovulation, while sperm can survive in the female reproductive tract for up to five days.

What Happens If the Egg Is Not Fertilised?

If the egg is not fertilised during its lifetime, it will begin to degenerate and eventually be absorbed by the body. Hormone levels then change, causing the lining of the uterus to shed during menstruation.

It is important to remember that insemination does not guarantee pregnancy. The resulting embryo must also develop and successfully enter the uterine lining.

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