What is the purpose of DNA quantification in a forensic workflow?

What is the purpose of DNA quantification in a forensic workflow?

• A. To determine the sequence of the DNA
• B. To estimate DNA amount, guide PCR input, and assess potential inhibition
• C. To identify tissue type
• D. To color-code samples

Answer: (B)

Quantifying DNA in a forensic workflow is about estimating how much amplifiable DNA is present and using that information to optimize the PCR step. Knowing the amount helps decide how much template to load into the PCR reaction—too little can yield incomplete profiles, while too much can overwhelm the reaction or reveal inhibited amplification. It also serves as a check for inhibitors in the sample, because quantification often uses an assay that signals whether the template can be efficiently amplified. This helps you decide on dilution, whether to adjust cycle numbers, or if the sample may be unsuitable for reliable profiling. The other ideas aren’t the goal of quantification: sequencing requires different measurements and methods, identifying tissue type is a separate analysis, and color-coding samples is a handling practice, not a measurement of DNA quantity or quality.

Quantifying DNA in a forensic workflow is about estimating how much amplifiable DNA is present and using that information to optimize the PCR step. Knowing the amount helps decide how much template to load into the PCR reaction—too little can yield incomplete profiles, while too much can overwhelm the reaction or reveal inhibited amplification. It also serves as a check for inhibitors in the sample, because quantification often uses an assay that signals whether the template can be efficiently amplified. This helps you decide on dilution, whether to adjust cycle numbers, or if the sample may be unsuitable for reliable profiling.

The other ideas aren’t the goal of quantification: sequencing requires different measurements and methods, identifying tissue type is a separate analysis, and color-coding samples is a handling practice, not a measurement of DNA quantity or quality.