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PCR Technologies: Comparing qPCR, RT-qPCR, Digital PCR and KASP Genotyping

Polymerase chain reaction (PCR) is the foundation of many molecular biology, diagnostics and genomics workflows. From conventional PCR and real-time quantification to SNP genotyping and absolute nucleic acid quantification, selecting the appropriate PCR method and chemistry is essential for generating reliable, reproducible data. Understanding the differences between qPCR, RT-qPCR, multiplex PCR, digital PCR (dPCR) and KASPâ„¢ genotyping can help scientists identify the most suitable workflow for their application.

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Choosing the right PCR technology for
your application

Comparing PCR technologies for amplification, quantification, RNA analysis and SNP genotyping

PCR encompasses a range of techniques for nucleic acid amplification and analysis. Conventional PCR enables end-point DNA detection, while qPCR provides real-time fluorescence monitoring for quantitative analysis. RT-qPCR incorporates reverse transcription for RNA quantification, and multiplex PCR enables simultaneous detection of multiple targets within a single reaction.

For applications requiring absolute quantification, digital PCR (dPCR) partitions samples into thousands of reactions and uses Poisson statistics to determine target concentration without standard curves. For SNP and indel genotyping, KASPâ„¢ genotyping combines competitive allele-specific PCR with fluorescence-based end-point detection to deliver accurate bi-allelic discrimination.

Widely used in agricultural genomics and applied research, KASPâ„¢ Genotyping Assays provide a flexible, cost-effective solution for low- to medium-density marker analysis. Selecting the appropriate PCR approach depends on assay objectives, performance requirements and downstream analytical needs.

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Who uses PCR, qPCR and genotyping technologies?

  • Molecular biologists

  • Assay development scientists

  • Genomics researchers

  • Agricultural genomics specialists

  • Molecular diagnostics teams

  • Clinical research laboratories

  • SNP genotyping laboratories

  • Translational research organisations

  • Pathogen detection laboratories

Selecting and optimising PCR workflows

From assay design and quantification to multiplex detection and genotyping, PCR performance depends on careful workflow selection and optimisation.

Choosing the correct PCR method

Different applications require different PCR approaches. Conventional PCR supports end-point analysis, qPCR enables quantitative real-time measurements, RT-qPCR enables RNA analysis, digital PCR provides absolute quantification and KASPâ„¢ Genotyping Assays deliver accurate SNP and indel discrimination for genotyping workflows.

Designing robust assays

Successful PCR workflows depend on optimised primer and probe design. Factors such as melting temperature (Tm), GC content, amplicon length, secondary structures, primer-dimer formation and probe chemistry selection influence amplification efficiency, assay specificity and analytical sensitivity.

Understanding amplification performance

Key performance metrics such as amplification efficiency, Cq values, standard curve linearity, dynamic range and correlation coefficients (R²) are used to assess qPCR assay performance, optimise workflows and support reliable quantitative results.

Managing contamination and controls

No-template controls, positive controls, extraction controls and reference materials help ensure analytical validity, reduce the risk of false-positive and false-negative results and support confidence in quantitative and qualitative PCR results.

Multiplexing without compromising performance

Multiplex PCR enables simultaneous detection of multiple targets within a single reaction. Successful multiplex assays require careful management of fluorophore selection, spectral overlap, probe design and target discrimination. Technologies such as BHQâ„¢ Quenchers and MGBâ„¢ Probes can improve signal-to-noise ratios, mismatch discrimination and multiplex assay performance, particularly in complex qPCR workflows.

Improving reproducibility and quantification

Digital PCR partitions reactions into thousands of individual microreactions, enabling absolution quantification using Poisson statistics without the need for standard curves. The technology is particularly valuable for rare variant detection, copy number variation analysis and measurement of low-abundance targets.

Comparing PCR methods for quantification, genotyping and detection

No single PCR workflow is suitable for every application. The choice depends on whether your objective is amplification, relative quantification, RNA analysis, multiplex detection, absolute quantification or SNP genotyping.

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Close-up of a PCR thermal cycler touchscreen displaying an amplification protocol, with a gloved hand adjusting temperature and cycling parameters during assay setup.

Conventional and end-point PCR

Conventional PCR amplifies DNA targets through thermal cycling and is commonly used for target detection, amplicon verification and downstream analyses where fluorescence-based quantification is not required.

qPCR and RT-qPCR

Real-time fluorescence monitoring enables quantitative nucleic acid analysis, gene expression studies and assay optimisation. Probe-based assays utilising BHQâ„¢ Quenchers, MGBâ„¢ Probes and other probe chemistries can enhance specificity and multiplexing capability.

Digital PCR and KASPâ„¢ genotyping

Digital PCR enables absolute target quantification and rare variant analysis, while KASPâ„¢ genotyping supports highly accurate SNP and indel discrimination for agricultural genomics, breeding and other applied research applications.

Applications and technologies related to PCR

Applications

PCR technologies support a broad range of molecular biology, diagnostic and genomics workflows, including pathogen detection, molecular testing, laboratory quality control, gene expression analysis and SNP genotyping.

Related Products and Solutions

SNP Genotyping

KASPâ„¢ Genotyping Assays

Competitive allele-specific PCR assays designed for accurate bi-allelic SNP and indel genotyping using fluorescence-based end-point detection. Suitable for applications in agricultural genomics, marker-assisted breeding, trait selection and applied research programmes.

KASPâ„¢ Genotyping Assays

Genotyping Services

KASPâ„¢ Genotyping Services

Comprehensive genotyping services supporting agricultural breeding, germplasm characterisation, marker validation and large-scale genomics studies through flexible outsourced workflows.

KASPâ„¢ Genotyping Services

Assay Components

Oligos, Probes and Primers

Custom oligonucleotides, primers and fluorescent probes including BHQâ„¢ Probes, MGBâ„¢ Probes, molecular beacons and Scorpionsâ„¢ primers for PCR, qPCR, RT-qPCR, multiplex PCR and digital PCR workflows.

Oligos, Probes and Primers

qPCR Chemistry

Custom DNA Probes for qPCR

Custom BHQâ„¢, MGBâ„¢, LNA, molecular beacon and Scorpionsâ„¢ probe chemistries designed to support sensitive detection, enhanced specificity and multiplex qPCR assay development across research and diagnostic workflows.

Custom DNA Probes for qPCR

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PCR, qPCR and genotyping expertise

Supporting scientists from assay development through to quantification, multiplexing and SNP genotyping.

Assay design expertise

Support for primer and probe design, amplification optimisation, multiplex assay development and workflow implementation.

Solutions across PCR technologies 

Access integrated solutions spanning conventional PCR, qPCR, RT-qPCR, multiplex PCR, digital PCR and KASPâ„¢ genotyping. Our portfolio includes custom oligonucleotides, BHQâ„¢ Probes and Quenchers, MGBâ„¢, LNA and other probe types, assay development expertise and genotyping services to support assay development, validation and deployment.

One partner for diagnostics and genomics

Expertise spanning custom oligos, fluorescent probe chemistries, PCR assay development, SNP genotyping technologies and outsourced genotyping services to support molecular testing and genomics programmes from discovery through implementation.

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Countries served through our global diagnostics and genomics network.

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Products supporting diagnostics, genomics and life science workflows.

Frequently asked questions

What is the difference between PCR and qPCR? 

PCR amplifies DNA and is typically analysed after thermal cycling. qPCR monitors amplification in real time using fluorescence, enabling quantitative analysis.

What is the difference between RT-qPCR and qPCR?

qPCR quantifies DNA targets directly. RT-qPCR includes a reverse transcription step that converts RNA into cDNA before amplification, enabling RNA detection and gene expression studies.

When should you use digital PCR instead of qPCR?

Digital PCR is often chosen when absolute quantification, rare variant detection or highly reproducible measurements are required.

Do you need a standard curve for digital PCR?

No. Digital PCR provides absolute quantification without requiring standard curve calibration.

What is a Cq value?

The quantification cycle (Cq) is the PCR cycle at which fluorescence exceeds a defined threshold above background signal. Lower Cq values generally indicate higher initial target abundance.

How many targets can you multiplex in a single reaction?

The number of targets depends on assay design, instrument capabilities, fluorophore selection and the extent of spectral overlap between detection channels.

Should I use probe-based or dye-based qPCR?

Dye-based assays provide a simple workflow, whereas probe-based assays offer additional target specificity and multiplexing capabilities.

What reagents are required for qPCR?

Typical qPCR workflows require primers, probes or DNA-binding dyes, and a qPCR master mix containing DNA polymerase, nucleotides, buffer components and other reaction additives.

When should I use KASP genotyping instead of qPCR?

KASP genotyping is designed specifically for SNP and indel discrimination and is commonly used for marker-assisted breeding, trait selection, germplasm screening and agricultural genomics applications. Unlike qPCR, which focuses on target detection and quantification, KASP technology is optimised for accurate end-point allelic discrimination.

What sample types are compatible with KASP genotyping?

KASP assays can be performed using DNA extracted from plant, animal, microbial and human samples. The technology is widely used across breeding programmes, agricultural research, livestock genomics and applied biology workflows.

What probe chemistries are available for qPCR and multiplex PCR?

Probe-based qPCR assays may utilise BHQ, BHQplus and BHQnova Probes, LNA Probes, MGBâ„¢ Probes, molecular beacons and Scorpionsâ„¢ primer technologies. Selection depends on the required sensitivity, specificity, multiplexing requirements and assay design objectives.

Need help selecting the right PCR technology?

Whether you are designing a new assay, developing a multiplex workflow, implementing digital PCR or planning a SNP genotyping study, our scientific experts can help identify the most appropriate PCR method and chemistry for your application.

Discuss your assay designBrowse oligos, probes and primers