A diagnostic test is any kind of medical test performed to aid in the diagnosis or detection of disease.Diagnostic tests can also be used to predict the prognosis of persons who have already been diagnosed with an illness. Answers, discoveries, or other outcomes are processed.

A diagnosis, in the sense of a diagnostic method, may be thought of as an attempt to categorise a person’s condition into discrete and distinct categories that allow doctors to make treatment and prognosis decisions. As a result, a diagnostic opinion is frequently characterised in terms of a sickness or another ailment. (However, in the instance of a misdiagnosis, the individual’s real ailment or condition differs from the diagnosis.