What is the sensitivity level of accepted protocols for biological evidence?

What is the sensitivity level of accepted protocols for biological evidence?

• A. 1 microgram
• B. 125 nanograms
• C. Sensitivity levels can reach as low as 125 picograms.
• D. 1 picogram

Answer: (C)

Sensitivity level refers to the smallest amount of DNA that can be detected and reliably typed using accepted forensic protocols. In typical PCR‑STR workflows used for biological evidence, that practical lower limit is around 125 picograms. Saying that sensitivity can reach as low as 125 picograms reflects the real-world capability of standard, validated methods to produce interpretable profiles from very tiny amounts of DNA. The other options describe much larger amounts (which would imply less sensitivity) or an amount that is not representative of standard, routinely validated protocols.

Sensitivity level refers to the smallest amount of DNA that can be detected and reliably typed using accepted forensic protocols. In typical PCR‑STR workflows used for biological evidence, that practical lower limit is around 125 picograms. Saying that sensitivity can reach as low as 125 picograms reflects the real-world capability of standard, validated methods to produce interpretable profiles from very tiny amounts of DNA. The other options describe much larger amounts (which would imply less sensitivity) or an amount that is not representative of standard, routinely validated protocols.