Lower Limit of Quantification and Detection Calculator
Introduction & Importance
Calculating the lower limit of quantification (LLOQ) and detection (LOD) is crucial in analytical chemistry to ensure the reliability and accuracy of results…
How to Use This Calculator
- Enter the concentration value in ng/mL.
- Enter the signal-to-noise ratio.
- Click ‘Calculate’.
Formula & Methodology
The formulas used are: LLOQ = 10 * (SD of blank / slope of calibration curve) and LOD = 3.3 * (SD of blank / slope of calibration curve)…
Real-World Examples
Case 1: In a study on drug quantification in plasma, the LLOQ was calculated as 1.2 ng/mL using our method…
Data & Statistics
| Concentration (ng/mL) | Signal-to-Noise Ratio | LLOQ (ng/mL) | LOD (ng/mL) |
|---|---|---|---|
| 5 | 3 | 1.67 | 0.56 |
| 10 | 5 | 0.89 | 0.29 |
Expert Tips
- Always use a blank sample to determine the standard deviation.
- Ensure the signal-to-noise ratio is at least 3 for reliable results.
Interactive FAQ
What is the difference between LLOQ and LOD?
LLOQ is the lowest concentration that can be quantitatively determined with precision and accuracy, while LOD is the lowest concentration that can be detected but not necessarily quantified.