What is the recommended colonoscopy screening age for a person with a first-degree relative diagnosed with colorectal cancer at the age of 45?

The recommended age to begin colonoscopy screening for individuals with a first-degree relative diagnosed with colorectal cancer is 10 years earlier than the age at which the relative was diagnosed, or at age 40, whichever comes first. Since the relative was diagnosed at age 45, the screening should commence at age 35. However, current guidelines suggest beginning screening for individuals with a family history of colorectal cancer at age 40, which aligns with the selection of the age in the first choice.

This recommendation is based on the understanding that having a first-degree relative with colorectal cancer significantly increases an individual's risk for developing the disease. Therefore, earlier and more frequent screenings are crucial for effective prevention and early detection of colorectal cancer in these high-risk individuals.