ELISA Linear Standard Curve
Interpolate an ELISA sample concentration on a linear standard curve as (absorbance − intercept) / slope. This calculation is only appropriate over a validated linear assay range; it is not a four-parameter logistic fit.
Description
Interpolate an ELISA sample concentration on a linear standard curve as (absorbance − intercept) / slope. This calculation is only appropriate over a validated linear assay range; it is not a four-parameter logistic fit.
ELISA Linear Standard Curve is a focused biology tool that interpolate an ELISA sample concentration on a linear standard curve as (absorbance − intercept) / slope. This calculation is only appropriate over a validated linear assay range; it is not a four-parameter logistic fit. It calculates locally from the values you enter and exposes the result without changing the source observations.1
When to use ELISA Linear Standard Curve
Use ELISA Linear Standard Curve when you need to interpolate an ELISA sample concentration on a linear standard curve as (absorbance − intercept) / slope. This calculation is only appropriate over a validated linear assay range; it is not a four-parameter logistic fit. Enter Absorbance, Slope, and Intercept using the definitions and units below so the result can be reproduced.
- Absorbance
- Measured optical density of the sample.
- Slope
- Slope of the linear standard curve; must be greater than zero.
- Intercept
- Intercept of the linear standard curve at zero concentration; may be any finite value.
How ELISA Linear Standard Curve calculates the result
The published tool contract uses this rule: Interpolate an ELISA sample concentration on a linear standard curve as (absorbance − intercept) / slope. This calculation is only appropriate over a validated linear assay range; it is not a four-parameter logistic fit.
- Concentration
- Interpolated concentration in nanograms per millilitre; may be negative for below-blank absorbances.
Limitations of ELISA Linear Standard Curve
The output is an estimate tied to the stated model and coefficients; it is not a direct measurement and should retain that label when reported.
Alternative or Complementary measurements
Retain the original Absorbance, Slope, and Intercept values and their units alongside the result. DNA Conc From A260 is useful when you instead need to convert an A260 absorbance reading into double-stranded DNA concentration using the 50 ng/µL per absorbance unit factor. Protein Conc From A280 provides another view by helping you convert an A280 absorbance reading into protein concentration via the Beer-Lambert mass extinction coefficient in mL/(mg·cm).
References
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ELISA — Wikipedia contributors
Similar or alternative tools
- DNA Conc From A260
Convert an A260 absorbance reading into double-stranded DNA concentration using the 50 ng/µL per absorbance unit factor.
- Protein Conc From A280
Convert an A280 absorbance reading into protein concentration via the Beer-Lambert mass extinction coefficient in mL/(mg·cm).
- RNA Conc From A260
Convert an A260 absorbance reading into RNA concentration using the 40 ng/µL per absorbance unit factor.