Students who are invited to apply for the membership of the Lexington High School Chapter of National Honor Society must have attained a cumulative GPA of 3.50 or above at the end of their sophomore year. Secondly, they must exhibit outstanding leadership qualities, character, and service during their years in high school. Once the student has become a member, they must maintain their GPA and attend all NHS meetings as well as complete a service requirement during the school year.

Students must register at least 20 hours of community service for NHS during their junior year (at least 15 hours must be NHS-specific hours). During their senior year, they must register another 20 hours, but only 10 hours are required to be spent on NHS-specific projects.

The standards that have been put in place by the Lexington High School chapter of NHS make it an organization devoted to the improvement of community, school, and self by adhering to the characteristics of Leadership, Service, Character, and Scholarship. Over the course of their junior and senior years students participate in several community service activities such as YES (youth exploration of science), peer tutoring, Special Olympics, Red Cross blood drive, and many more.