What is considered the gold standard for confirmatory drug testing?

What is considered the gold standard for confirmatory drug testing?

• A. GC-MS
• B. HPLC
• C. TLC
• D. ELISA

Answer: (A)

Gas chromatography-mass spectrometry provides definitive identification and precise quantitation of drugs. By first separating the sample components and then analyzing their mass spectra, each drug leaves a unique fingerprint. When the observed retention time and the mass spectrum match validated reference standards, you can confirm the drug’s identity with high confidence. Immunoassays used for screening can give false positives from cross-reactivity, and while HPLC can separate compounds, it typically lacks the definitive identification that MS offers. TLC is older and less sensitive. So GC-MS is considered the gold standard for confirmatory testing because it combines reliable separation with highly specific identification and accurate measurement.

Gas chromatography-mass spectrometry provides definitive identification and precise quantitation of drugs. By first separating the sample components and then analyzing their mass spectra, each drug leaves a unique fingerprint. When the observed retention time and the mass spectrum match validated reference standards, you can confirm the drug’s identity with high confidence. Immunoassays used for screening can give false positives from cross-reactivity, and while HPLC can separate compounds, it typically lacks the definitive identification that MS offers. TLC is older and less sensitive. So GC-MS is considered the gold standard for confirmatory testing because it combines reliable separation with highly specific identification and accurate measurement.