High Power Field

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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 at Dallas. Used in Interactive Case Study Companion to Pathologic basis of disease.