Flow Cytometry
Flow Cytometry is a lab tool that sorts and counts cells one by one using a beam of light.
Think of it this way
Blueberries roll down a chute one at a time past a bright flashlight. The light bounces off each berry and tells a sensor its size and color. A little puff of air then flicks each berry into the right bowl — ripe ones left, unripe ones right. That is how flow cytometry sorts thousands of cells in seconds.
Explaining flow cytometry by grade level
Your blood has many types of tiny cells. A special machine lines them up in a stream. It shines a light on each one as it flows past. The light tells which kind of cell it is.