In health

Health

Health is the level of functional or metabolic efficiency of a living being. In humans, it is the general condition of a person's mind, body and spirit, usually meaning to be free from illness, injury or pain...

-related fields, a reference range or reference interval usually describes the variations of a measurement or value in healthy individuals. It is a basis for a physician

Physician

A physician is a health care provider who practices the profession of medicine, which is concerned with promoting, maintaining or restoring human health through the study, diagnosis, and treatment of disease, injury and other physical and mental impairments...

 or other health professional to interpret a set of results for a particular patient.

The standard definition of a reference range (usually referred to if not otherwise specified) basically originates in what is most prevalent in a reference group

Reference group

A reference group is a concept referring to a group to which an individual or another group is compared.Sociologists call any group that individuals use as a standard for evaluating themselves and their own behavior a reference group....

 taken from the population.