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General instrument information for researchers and core-facility staff. It is not a purchasing recommendation or a validated-method instruction, and these instruments are labelled for research use only.
Short answer
QuantStudio is Thermo Fisher Scientific’s family of real-time (quantitative) PCR instruments. The family covers the QuantStudio 3 and 5, the 6 and 7 Pro, the 6 and 7 Flex, and the 12K Flex. Thermo Fisher labels them “For Research Use Only. Not for use in diagnostic procedures.” The models differ mainly in block format, multiplexing capacity and temperature-zone control.
Definition and scope
A real-time PCR system is a thermal cycler with an optical module. It heats and cools a reaction plate through repeated cycles while measuring fluorescence at each cycle, so amplification can be followed as it happens instead of read out on a gel afterwards. QuantStudio systems are Thermo Fisher’s instruments of this type. Thermo Fisher pairs them with Design and Analysis 2 software, a touch screen on the instrument, and a browser-based cloud platform called Connect (Thermo Fisher QuantStudio systems page, read 2026-11-08).
This page covers the instrument family and its published specifications. For assay chemistry, see the SYBR Green real-time PCR protocol; for data analysis, see qPCR ΔΔCt data analysis.
How the system is used in practice
Block formats and VeriFlex zones
Thermo Fisher states that most QuantStudio systems with a 96-well block feature VeriFlex technology. The block is divided into three or six VeriFlex zones, and each zone can run a different temperature. In practice this lets a single run test several annealing temperatures side by side, which is useful when optimizing a new primer set.
Dyes, filters and multiplexing
Multiplexing means detecting more than one target in the same well by using differently coloured dyes. The QuantStudio 5 specification sheet lists compatibility with FAM/SYBR Green, VIC/JOE/HEX/TET, ABY/NED/TAMRA/Cy3, JUN, ROX/Texas Red, Mustang Purple, Cy5/LIZ and Cy5.5. For the 96-well QuantStudio 5 it lists six decoupled filters giving up to 21 excitation/emission combinations, and five coupled filters for the 384-well block. The sheet is dated 2015, so confirm current dye lists against Thermo Fisher’s present documentation.
Analysis types and reporting
The QuantStudio 5 sheet lists single-plate analysis for absolute and relative gene expression, SNP genotyping, presence/absence and high resolution melt, and multi-plate analysis for gene expression and SNP genotyping. It notes MIQE compliance support and RDML export. MIQE 2.0 (Bustin et al., Clinical Chemistry 2025;71(6):634-651, doi:10.1093/clinchem/hvaf043) is the current reporting checklist; the instrument records data, but the checklist items about reagents, samples and analysis remain the researcher’s to report.
QuantStudio 3 versus 5: a sourced comparison
Thermo Fisher’s QuantStudio 3 and 5 page gives these values side by side (read 2026-11-08).
| Feature | QuantStudio 3 | QuantStudio 5 |
|---|---|---|
| Block formats | 96-well, 0.1 mL and 0.2 mL | 96-well, 0.1 mL and 0.2 mL; also 384-well |
| Multiplexing | Up to 4 targets | Up to 6 targets (96-well); up to 5 (384-well) |
| VeriFlex zones | 3 | 6 (96-well block only) |
| Block type | Fixed | Fixed |
Both models are described as offering 1.5-fold discrimination, a touchscreen, onboard memory for more than 2,000 runs, and 21 CFR Part 11 features (security, auditing and electronic signatures). The 6 and 7 Pro and Flex models and the 12K Flex are listed in the same family and are not compared here.
Quantitative specifications of the QuantStudio 5
Per the QuantStudio 5 specification sheet: dynamic range of 10 logs, sensitivity of 1 copy, 1.5-fold resolution in singleplex, run time under 30 minutes, maximum ramp rate 6.5 °C/s, temperature uniformity 0.4 °C, and factory calibration. Reaction volumes are 10-30 µL (0.1 mL 96-well block), 10-100 µL (0.2 mL 96-well block) and 5-20 µL (384-well block). Treat these as manufacturer-reported figures for a specific configuration, not as performance you will reproduce with every assay.
Where it matters for labs and core facilities
A checklist built from the sourced specifications, for anyone booking time on a shared instrument or writing a methods section:
- Plate and block format. Match your plate to 96-well (0.1 or 0.2 mL) or 384-well; the QuantStudio 3 has no 384-well block.
- Reaction volume. Check your volume sits inside the range listed for that block.
- Dyes and targets. Count your targets against the multiplex limit (4 on the QuantStudio 3, 6 or 5 on the QuantStudio 5) and confirm each dye is on the filter list.
- Temperature optimization. If you need to compare annealing temperatures in one run, check the VeriFlex zone count of the model.
- Records. If your work needs audit trails or e-signatures, the QuantStudio 3 and 5 pages list 21 CFR Part 11 features.
- Intended use. The systems are research use only; diagnostic claims need a separately cleared or validated workflow.
Common misunderstandings
- “Research use only” is not “approved for diagnostics”. Thermo Fisher’s own statement excludes diagnostic procedures. For how clinical amplification tests are defined, see nucleic acid amplification test (NAAT).
- The QuantStudio 3 and 5 are not interchangeable. Only the 5 has a 384-well block, and the multiplex and VeriFlex counts differ.
- Real-time PCR is not the only quantification route. For when absolute counting suits better, compare digital PCR and qPCR and see ddPCR.
FAQ
What is a QuantStudio 5?
The QuantStudio 5 is a fixed-block real-time PCR instrument available with 96-well (0.1 or 0.2 mL) or 384-well blocks, multiplexing up to 6 targets in 96-well format and 5 in 384-well, with six VeriFlex zones on the 96-well block.
What is a real-time PCR system?
It is a thermal cycler that measures fluorescence during every cycle, so the amount of amplified product can be tracked in real time. QuantStudio is one family of such systems.
Can QuantStudio instruments be used for diagnosis?
Thermo Fisher labels them for research use only and not for diagnostic procedures.
Sources
- Thermo Fisher Scientific, QuantStudio real-time PCR systems product page, read 2026-11-08: thermofisher.com
- Thermo Fisher Scientific, QuantStudio 3 and 5 product page, read 2026-11-08: thermofisher.com
- Thermo Fisher Scientific, QuantStudio 5 specification sheet (2015), read 2026-11-08
- Bustin SA et al., MIQE 2.0, Clinical Chemistry 2025;71(6):634-651, doi:10.1093/clinchem/hvaf043
