What is the difference between LOD and LOQ in reporting results?

What is the difference between LOD and LOQ in reporting results?

• A. LOD: limit of denomination; LOQ: level of quantification.
• B. LOD and LOQ are identical.
• C. LOD: limit of detection; LOQ: limit of quantitation; results may be detected but not quantified.
• D. It is invalid data.

Answer: (C)

The main idea here is understanding what each limit means in reporting results. The limit of detection is the smallest amount of analyte that can be reliably distinguished from background noise—you know something is present, but you can’t confidently quantify how much. The limit of quantitation is higher and represents the smallest amount that can be measured with acceptable precision and accuracy, giving you a numeric value you can trust. When a result falls between these two, you’ve detected the substance but cannot accurately quantify it, so you’d report it as detected but not quantified. That’s why the correct description is that the limit of detection is about detection, while the limit of quantitation is about reliable measurement. The other choices aren’t right because they either redefine the terms incorrectly or claim they’re the same, which they are not.

The main idea here is understanding what each limit means in reporting results. The limit of detection is the smallest amount of analyte that can be reliably distinguished from background noise—you know something is present, but you can’t confidently quantify how much. The limit of quantitation is higher and represents the smallest amount that can be measured with acceptable precision and accuracy, giving you a numeric value you can trust. When a result falls between these two, you’ve detected the substance but cannot accurately quantify it, so you’d report it as detected but not quantified. That’s why the correct description is that the limit of detection is about detection, while the limit of quantitation is about reliable measurement.

The other choices aren’t right because they either redefine the terms incorrectly or claim they’re the same, which they are not.