A test designed to identify subjects who are at sufficient risk of a specific disorder to benefit from further investigation or preventive action, among those who have not sought medical attention on account of symptoms of that disorder.
"Screening tests" are tests used to check, or screen, for disease when there are no symptoms. Screening tests for colorectal cancer include: fecal occult blood test, flexible sigmoidoscopy, colonoscopy, and double contrast barium enema. (When a test is performed to find out why symptoms exist, it is called a "diagnostic" test).
An abbreviated toxicity test with one or two toxicant concentrations. Some Regional and State effluent biomonitoring programs stipulate its use. If lethality is observed in the screening test, a definitive test may be required.