Screening entails the mass testing of individuals of a certain age and gender, regardless of family history or personal health, to identify a potential disease state. For screening to be useful, the test or procedure must readily identify the disease in question, and the subsequent treatment must result in some measurable benefit.
筛查包括对特定年龄和性别个体（不管家族史和个人健康状况）的大量试验，以识别潜在病情。为了让筛查起作用，试验或程序必须能够识别可以病症，后续的治疗也必须产生可测量的效果。换句话说，被筛查人群的境况必须较未被筛查人群更好。