A process employed to confirm the presence of a selected substance or situation, usually after a preliminary screening course of has indicated a possible constructive outcome. This secondary evaluation makes use of a special analytical approach or methodology than the preliminary display screen, aiming to offer a extra definitive and dependable identification. For instance, in drug testing, an preliminary immunoassay display screen is perhaps adopted by fuel chromatography-mass spectrometry to verify the presence and amount of a selected drug.
The utility of this kind of process lies in its capacity to scale back the incidence of false positives. By using a extra delicate and particular technique, the chance of an incorrect constructive result’s considerably diminished. That is particularly essential in contexts the place a constructive discovering carries vital penalties, akin to employment selections, medical diagnoses, or authorized proceedings. Traditionally, the event of those exams has mirrored developments in analytical chemistry and expertise, permitting for more and more exact and dependable determinations.
