Which one of the following techniques does not serve the purpose of early diagnosis of a disease for its early treatment?

1. Enzyme Linked Immuno-Sorbent Assay (ELISA) technique

2. Recombinant DNA Technology

3. Serum and Urine analysis

4. Polymerase Chain Reaction (PCR) technique

Doubtly Asked 30 Oct 2026 NEET UG 2023 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 3. Serum and Urine analysis

Key idea: Early diagnosis needs methods that detect a pathogen or a gene before symptoms appear.

PCR amplifies the DNA of a pathogen, such as HIV, even in very small amounts.
ELISA detects antigens or antibodies of a pathogen.
Recombinant DNA technology gives probes and tests for gene-level detection.
Serum and urine analysis is a conventional test that shows disease only after it has developed, so it does not serve early diagnosis.

The answer is option 3.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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