How to Choose a Flow Cytometer: Analyzer vs. Sorter and Key Specifications Explained

Flow cytometers are among the most complex and highest-value instruments in a cell biology or immunology laboratory. Selecting the right instrument requires understanding your panel requirements, throughput needs, and the trade-offs between analyzers and cell sorters. This guide covers the key decision points for labs sourcing flow cytometers.

What Is a Flow Cytometer?

A flow cytometer measures physical and fluorescent properties of individual cells or particles as they pass single-file through one or more laser beams. Detectors measure forward scatter (cell size), side scatter (cell granularity), and fluorescence emission from labeled antibodies or dyes. Modern instruments can simultaneously measure 20 or more parameters per cell at rates of thousands of cells per second.

Analyzer vs. Cell Sorter

Flow cytometry analyzers measure and record data from cells passing through the instrument but do not physically separate populations. Cell sorters add electrostatic deflection or microfluidic sorting to physically collect defined cell populations into tubes or plates. Sorters are significantly more expensive to purchase and operate and require more specialized training. Most labs start with an analyzer and access sorting through a core facility.

Laser Configuration

Laser configuration is the most important specification to match to your fluorochrome panel. Common laser lines include 405 nm (violet), 488 nm (blue), 561 nm (yellow-green), and 638 nm (red). Each laser excites a subset of fluorochromes, and the number of detectors per laser determines how many parameters you can measure simultaneously. Define your panel requirements before selecting an instrument platform.

Number of Detectors and Parameters

Entry-level analyzers typically offer 6-10 parameters. Mid-range instruments offer 12-18 parameters. High-end spectral flow cytometers can resolve 30 or more parameters simultaneously using full spectral unmixing rather than bandpass filters. Match the parameter count to your most complex planned panel, with room for future expansion.

Throughput and Sample Handling

For high-throughput screening or clinical applications, confirm the instrument's sample acquisition rate and compatibility with plate loaders and high-throughput samplers. For standard research applications, manual tube loading is sufficient.

New vs. Refurbished Flow Cytometers

Refurbished flow cytometers from BD Biosciences, Beckman Coulter, and Thermo Fisher can offer significant cost savings compared to new instruments. Key checks for refurbished instruments include laser power verification, detector sensitivity (using standard beads), fluidics integrity, and software license status. Confirm that the instrument's laser and detector configuration matches your panel requirements before purchasing.

Source Flow Cytometers from mLab Supply

mLab Supply sources new, refurbished, and surplus flow cytometers from BD Biosciences, Beckman Coulter, Thermo Fisher, and Miltenyi for research, clinical, and bioprocess laboratories. Submit a quote request and we will confirm current availability, laser/detector configuration, and lead time within 1-2 business days.

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Frequently Asked Questions – Flow Cytometer Buyer's Guide

Should I buy an analyzer or a cell sorter for my lab?

Most labs should start with an analyzer and access cell sorting through a core facility. Sorters are significantly more expensive to purchase and operate and require specialized training and biosafety infrastructure. Only purchase a sorter if your lab has high sorting throughput needs that cannot be met by a shared facility.

How many lasers and detectors do I need for my panel?

Define your largest planned antibody panel first, then select an instrument with enough lasers and detectors to cover all fluorochromes with room for future expansion. A 3-laser, 12-detector instrument covers most standard immunophenotyping panels. Larger panels require 4 or more lasers.

What should I check when buying a refurbished flow cytometer?

Verify laser power output using a power meter, confirm detector sensitivity using standard calibration beads, check fluidics integrity for leaks and pressure stability, and confirm software license status and compatibility with your operating system.

Can mLab Supply source flow cytometers with specific laser configurations?

Yes. Submit a quote request specifying your required laser lines, detector count, and manufacturer preference and we will confirm available configurations and lead time.