What method can be used for the identification of presumably healthy individuals from ill individuals?

The identification of presumably healthy individuals from ill individuals is effectively achieved through a screening test. Screening tests are designed to detect potential health disorders or diseases in individuals who do not yet exhibit symptoms. These tests are performed on a large population to identify those who may need further evaluation or treatment.

Unlike cohort studies and case-control studies, which focus on examining relationships between risk factors and disease outcomes, screening tests are proactive tools aimed at early detection. Experimental studies, such as clinical trials, evaluate the effects of treatments but do not serve the primary purpose of distinguishing between healthy and ill individuals. Therefore, the use of screening tests is crucial in public health for early diagnosis, which can lead to better management and outcomes for diseases.