Discussion
Screening tests are performed for
Answer: A
Screening tests are performed for tentative identification, option A. A screening test, such as a colour test or a thin layer chromatogram, is quick and simple and shows that a substance may be present, but it is not specific, so a confirmatory test is needed. Definite identification (B) requires a specific method such as mass spectrometry, and quantitative (C) and semiquantitative (D) analyses measure the amount of the substance, which a screening test does not do. Examples of screening tests in a toxicology laboratory include the colour tests, thin layer chromatography and immunoassay kits, which are followed by gas chromatography with mass spectrometry for confirmation.
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