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Updated: Feb 17, 2026

Development of a Quantitative Recombinase Polymerase Amplification Assay with an Internal Positive Control

Development of a Quantitative Recombinase Polymerase Amplification Assay with an Internal Positive Control

Published on: March 30, 2015

Note on the PCR threshold standard curve.

Benedict G Archer¹

¹, Vallejo, CA, USA. bglendon0@gmail.com.

BMC Research Notes

|December 13, 2017

Summary

This summary is machine-generated.

This study reconciles PCR threshold standard curve methods by allowing thresholds beyond the exponential phase. This ensures accurate results even when initial amplification efficiency varies, improving PCR analysis validity.

Keywords:

Efficiency PCR Standard curve Threshold qPCR

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Area of Science:

Molecular Biology
Biochemistry
Quantitative PCR

Background:

The standard curve in quantitative PCR (qPCR) relies on an exponential model of early amplification.
Accurate qPCR requires the threshold to be set within the exponential phase and consistent initial efficiency across all samples.
Current practices may not always verify these conditions, potentially impacting result validity.

Purpose of the Study:

To reconcile the use of qPCR threshold standard curves with conditions where amplification may not be strictly exponential at the threshold.
To address the discrepancy between theoretical requirements and practical application of qPCR threshold setting.

Main Methods:

Modified the derivation of the standard curve to include cycles beyond the initial exponential phase.
Introduced a more general requirement for congruence of amplification profile shapes up to the threshold level, allowing for translational shifts along the cycle axis.

Main Results:

The revised method allows for valid threshold setting even when amplification is not strictly exponential at that level.
The approach enables verification of consistent initial amplification efficiency across calibration and test samples.
This reconciliation does not affect the usage of the existing qPCR method or previously obtained results.

Conclusions:

The study provides a more robust and practical approach to qPCR standard curve analysis.
The findings enhance the reliability of qPCR by accommodating variations in amplification kinetics.
A practicable method is now available to verify the critical requirement of consistent initial PCR efficiency.