What is hydrodynamic focusing in flow cytometry?

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Multiple Choice

What is hydrodynamic focusing in flow cytometry?

Hydrodynamic focusing uses the surrounding sheath fluid to center and compress the sample stream so cells pass through the interrogation point in a narrow, single-file core. This fluid-driven confinement ensures each cell is measured individually by the laser and detectors, preventing two or more cells from being in view at once (coincidence) and giving consistent forward/side scatter and fluorescence readings. The described setup—sheath fluid on both sides shaping the stream—is exactly how this focusing works. Other techniques like gravity-based alignment, magnetic separation, or electrical impedance operate by different principles and don’t achieve this precise, single-file optical interrogation.

Hydrodynamic focusing uses the surrounding sheath fluid to center and compress the sample stream so cells pass through the interrogation point in a narrow, single-file core. This fluid-driven confinement ensures each cell is measured individually by the laser and detectors, preventing two or more cells from being in view at once (coincidence) and giving consistent forward/side scatter and fluorescence readings. The described setup—sheath fluid on both sides shaping the stream—is exactly how this focusing works. Other techniques like gravity-based alignment, magnetic separation, or electrical impedance operate by different principles and don’t achieve this precise, single-file optical interrogation.

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