Five Parameter Logistic Curve (with Sensitivity 2SD)

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(3 min 24 sec)
5PL

Quantitative analysis of samples using a Five Parameter Logistic (5PL) curve fit suitable for calculating concentrations from asymmetrical sigmoidal calibrators.

The sensitivity or Lowest Detection Limit (LDL) is calculated as 2 SD above the mean of the Zero replicates.

This analysis optionally includes a background correction step. If the Blank group is included on your layout, the mean of the Blank replicates is first subtracted from the raw data measurements (the corrected values are then used in the fit).

The standard data points (concentration vs. measurement) are plotted on semi-log axes and a 5PL is fitted through the points. The concentrations of the samples are determined from the fit with any specified dilution factors applied.

The %CV, Standard Deviation and Standard Error are calculated for each replicated sample.

Samples outside the range of the standards or the fit (greater than the upper asymptote or below than the lower asymptote) are highlighted in yellow.

See also Related assays
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Measurements

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Microplate

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Standard Concentrations

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Dilution Factors

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Sample IDs

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Run Notes