When reporting a diluted sample, which criteria must the result meet?

When reporting a diluted sample, which criteria must the result meet?

• A. The result must meet MDL/LOQ criteria.
• B. The result must be above the MDL.
• C. The result must be above the LOQ.
• D. The result must be reported regardless of MDL/LOQ.

Answer: (A)

When you report a diluted sample, you need to ensure the result is both detectable and quantitative within the method’s validated limits. MDL (minimum detection limit) is the smallest concentration that can be reliably distinguished from background noise, while LOQ (limit of quantitation) is the smallest concentration that can be measured with acceptable accuracy and precision. Dilution lowers the analyte concentration, so a result must be above both MDL and LOQ to be reported as a valid numeric value. If it doesn’t meet these criteria, you shouldn’t report a precise concentration (you might only indicate detected above MDL or flag for re-analysis).

When you report a diluted sample, you need to ensure the result is both detectable and quantitative within the method’s validated limits. MDL (minimum detection limit) is the smallest concentration that can be reliably distinguished from background noise, while LOQ (limit of quantitation) is the smallest concentration that can be measured with acceptable accuracy and precision. Dilution lowers the analyte concentration, so a result must be above both MDL and LOQ to be reported as a valid numeric value. If it doesn’t meet these criteria, you shouldn’t report a precise concentration (you might only indicate detected above MDL or flag for re-analysis).