Flow cytometry is like counting and sorting different types of cells as they flow past a laser, by checking the tags or "CD" markers on them. A CD4 count measures one specific tag on helper T-cells, which tells us about the immune system's strength. People think it's just a cold number from a machine, but in my community clinic, I've seen that number tied to a mother's relief when she can hold her child without fear. My own mother's worry for my cough reminds me that every count is a story, not just data.
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