Current rapid diagnostic tests include which of the following?

• A. Polymerase chain reaction (PCR)
• B. Multiplex PCR
• C. Nanoparticle probe technology
• D. All of the above

Answer: (D)

The key idea is that modern rapid diagnostic tests span multiple technologies, all aimed at delivering fast, accurate results. Real-time and conventional PCR are foundational because they quickly detect pathogen genetic material with high specificity. Multiplex PCR takes this further by testing for several targets in one reaction, which is ideal for identifying multiple pathogens that cause similar symptoms. Nanoparticle probe technology adds a different edge: nanoparticles serve as highly sensitive labels or probes in rapid readouts, enabling quick and easy detection in formats like lateral flow or fluorescence-based assays. Taken together, these approaches illustrate that current rapid diagnostics include PCR-based methods, multiplex panels, and nanoparticle-based detection. Therefore, all of the above are used in current rapid diagnostic tests.