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Which one of the following techniques does not serve the purpose of early diagnosis of a disease for its early treatment?
Conventional diagnostic methods (serum and urine analysis) only detect diseases when pathogen load or tissue damage has already peaked (late detection). Molecular diagnostics (ELISA, PCR, rDNA probes) enable EARLY diagnosis when pathogen count is extremely low!
Conventional diagnostic techniques rely on gross biochemical changes or visible pathogen counts in blood/urine. By the time symptoms appear and serum/urine metabolites alter, the infection is already widely established:
NCERT states verbatim under Molecular Diagnosis: "Using conventional methods of diagnosis (serum and urine analysis, etc.) early detection is not possible. Recombinant DNA technology, Polymerase Chain Reaction (PCR) and Enzyme Linked Immuno-sorbent Assay (ELISA) are some of the techniques that serve the purpose of early diagnosis."
PCR can detect trace pathogens ( viral particles) by exponential target DNA amplification. ELISA exploits high-affinity antibody-enzyme conjugates to detect picogram antigen quantities before clinical symptom onset.
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ELISA is a modern molecular tool that explicitly serves early diagnosis; hence incorrect for the negative prompt.
rDNA technology with radioactive probes enables early detection of mutated genes and latent pathogens.
Matches NCERT verbatim: conventional serum and urine analysis cannot detect diseases early.
PCR is the quintessential early diagnosis tool (e.g., detecting HIV in suspected asymptomatic patients).
Because blood (serum) and urine tests are the most common laboratory tests ordered by doctors, students intuitively consider them reliable and miss that they are too insensitive for early detection.
"Using conventional methods of diagnosis (serum and urine analysis, etc.) early detection is not possible. Recombinant DNA technology, PCR and ELISA serve the purpose of early diagnosis."
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