Brushing your teeth twice a day keeps plaque and bacteria in check, which can help prevent dental problems such as cavities, gum disease, and oral infections.
Liquid biopsies analyze blood, urine, or sputum for DNA signatures of cancer, and can detect many cancers earlier than current screening protocols. The technology is still developing, but could radically transform cancer diagnosis and treatment.
This more complex metric than test sensitivity or specificity will allow you to understand the likelihood that any specific test result–whether positive or negative–is in fact accurate.