Limit of Quantification (LOQ)
Limit of Quantification (LOQ) — The lowest concentration of an analyte that can be quantitatively determined with acceptable precision and accuracy.
What Is the Limit of Quantification?
The limit of quantification (LOQ) is the lowest concentration of a peptide that can be measured with acceptable accuracy and precision (typically ±20% CV). LOQ is defined by a signal-to-noise ratio of 10:1 or 10σ/slope. LOQ sets the lower boundary of the reportable range for peptide biomarker measurements and stability testing.
Validation
- Accuracy: Measured concentration within ±20% of true value at LOQ
- Precision: CV ≤ 20% at LOQ from replicate measurements
- Clinical: LOQ must be below the lowest clinically relevant peptide concentration
Frequently Asked Questions
What is Limit of Quantification (LOQ)?
The lowest concentration of an analyte that can be quantitatively determined with acceptable precision and accuracy.
Why is Limit of Quantification (LOQ) important in peptide research?
Limit of Quantification (LOQ) is a fundamental concept in analytical as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.
Authority Sources
- Limit of Quantification (LOQ) on Wikipedia
- Search Limit of Quantification (LOQ) on PubChem (NIH)
- Research articles on ScienceDirect