At which time interval after ovulation is the ovum no longer viable?

The ovum, which is an egg released during ovulation, has a limited window of viability after it is expelled from the ovary. Typically, the ovum remains fertilizable for about 12 to 24 hours post-ovulation. The most accurate understanding is that the ovum has completely lost its viability by around 24 hours after ovulation.

After this period, the egg begins to degenerate, and the chances of successful fertilization decrease significantly. This time frame is critical for conception, as sperm can survive in a woman's reproductive tract for several days, but the ovum waits for union with a sperm only for a brief time.

Understanding this viability window helps in tracking fertile periods for conception and informs women about their reproductive health. This aspect of human reproduction is important for both family planning and understanding potential challenges in achieving pregnancy.