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Multiple Choice

In the PLT histogram, platelets are measured directly from which size range?

Platelets are the smallest blood cells, so the histogram that counts them uses a very small volume window. In practice, platelets are quantified within about 2 to 20 fL, which captures essentially all normal platelets while excluding debris that is even smaller and larger particles or platelet clumps that exceed 20 fL. The mean platelet volume (MPV) reported from this histogram reflects the central portion of that 2–20 fL distribution. Since red blood cells are much larger (around 80–100 fL), they fall outside this platelet gate, helping keep the platelet count accurate.

Platelets are the smallest blood cells, so the histogram that counts them uses a very small volume window. In practice, platelets are quantified within about 2 to 20 fL, which captures essentially all normal platelets while excluding debris that is even smaller and larger particles or platelet clumps that exceed 20 fL. The mean platelet volume (MPV) reported from this histogram reflects the central portion of that 2–20 fL distribution. Since red blood cells are much larger (around 80–100 fL), they fall outside this platelet gate, helping keep the platelet count accurate.