Flow cytometry machine: lasers, detectors and whether you need sorting

Configuring from the panel, and specifying a flow cytometer machine

1. Design the panel before the instrument. Write down the markers to be measured together now and plausibly in three years. That panel determines the lasers and detector configuration, and adding a laser later is expensive or impossible depending on the instrument. Every other decision follows from this one.
2. Spectral or conventional detection. Conventional cytometers assign one detector per fluorochrome and need careful compensation. Spectral instruments record a full emission signature and unmix afterwards, which handles larger panels and similar dyes better. Spectral costs more and changes the analysis workflow, so evaluate both with your own panel.
3. Analyser or sorter. An analyser measures and discards; a sorter physically separates populations for culture or sequencing. A sorter is substantially more expensive, needs more skill and space, and where the samples are infectious it requires aerosol containment. Many laboratories rightly use an analyser in house and a core facility for sorting.
4. Containment for sorting. Sorting generates aerosols, and with human or infectious material that means the sorter sits inside a containment enclosure with a defined aerosol management and testing regime. This is a facilities decision with a facilities budget, not an accessory.
5. Sample handling and throughput. Plate loaders, tube loaders and sample cooling decide whether a large experiment is practical. An instrument that can only run tubes by hand will limit throughput long before its optics do.

Controls, standards and comparability

Single stain controls, unstained controls and viability discrimination are not optional extras but the basis on which the data can be interpreted, and instrument standardisation beads are what make results comparable over time and between instruments.

Agree a standardisation routine at installation and keep the records. Panels that drift are usually instruments that drifted, and without a standardisation record the two cannot be told apart.

Flow cytometry instruments need skill and support

Cytometry rewards expertise more than most instrument categories, and a machine without a trained operator produces data nobody should trust. Budget for real training and for ongoing access to advice, whether from the vendor or a core facility.

Service contracts matter here because an instrument out of alignment produces plausible data rather than none. Ask what preventive maintenance includes and how quickly alignment problems are addressed.

Common questions

How many lasers do I need on a flow cytometer?

It follows from the panel. Write down the markers to be measured together now and in the foreseeable future, and configure the lasers and detectors to that panel, because adding a laser later is often impossible.

Spectral or conventional flow cytometry?

Spectral instruments record a full emission signature and handle large panels and spectrally similar dyes better, at higher cost and with a different analysis workflow. Conventional detection remains adequate for smaller panels.

Analyser or FACS flow cytometry: do I need a sorter?

Only if populations must be physically recovered for culture or sequencing. Sorters cost far more, need more skill, and with infectious or human material require aerosol containment. Many laboratories use an analyser in house and a core facility to sort.

What containment does sorting need?

Sorting generates aerosols, so with human or infectious samples the instrument sits inside a containment enclosure with a defined aerosol management and testing regime, which is a facilities project rather than an accessory.

Flow cytometry vs FACS: what is the difference?

FACS, fluorescence-activated cell sorting, is flow cytometry on a sorter: the cells are measured the same way and chosen populations are then physically recovered for culture or sequencing, where an analyser measures and discards them. A sorter costs far more, needs more skill, and with human or infectious material has to sit inside a containment enclosure because sorting generates aerosols.

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