High-power field

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A high-power field (HPF), when used in relation to microscopy, references the area visible under the maximum magnification power of the objective being used. Often, this represents a 400x magnification level when referenced in scientific papers.

The area provides a reference unit, for example in reference ranges for urine tests.[1]


  1. ^ Normal Reference Range Table from the University of Texas Southwestern Medical Center. Used in interactive case study companion to pathologic basis of disease.