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→Athanasou criterion
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====Athanasou criterion==== | ====Athanasou criterion==== | ||
*>= Ten neutrophils / ten [[HPF]] (x400).<ref name=pmid17545426/> | *>= Ten neutrophils / ten [[HPF]] (x400).<ref name=pmid17545426/> | ||
====Morawietz criteria==== | |||
*23 neutrophils/10 HPF, where the field diameter = 0.625 mm.<ref name=pmid19635104>{{Cite journal | last1 = Morawietz | first1 = L. | last2 = Tiddens | first2 = O. | last3 = Mueller | first3 = M. | last4 = Tohtz | first4 = S. | last5 = Gansukh | first5 = T. | last6 = Schroeder | first6 = JH. | last7 = Perka | first7 = C. | last8 = Krenn | first8 = V. | title = Twenty-three neutrophil granulocytes in 10 high-power fields is the best histopathological threshold to differentiate between aseptic and septic endoprosthesis loosening. | journal = Histopathology | volume = 54 | issue = 7 | pages = 847-53 | month = Jun | year = 2009 | doi = 10.1111/j.1365-2559.2009.03313.x | PMID = 19635104 }}</ref> | |||
Notes: | |||
*The 0.625 mm field diameter is uncommon; it corresponds to a 25 mm eye piece with a 40x objective (25 mm/40 = 0.625 mm). | |||
**The PMNs/area is: 23 PMNs / (pi/4*0.625^2) = 7.49 PMNs/mm*mm | |||
*If one uses a 22 mm eye piece microscope and the 40x objective, the field diameter is 0.55 mm; thus, one would need to count PMNs in 12.91 HPFs ( 3.0680 mm*mm / 0.2376 mm*mm = 12.91 ) to get the same sample area. | |||
====A comparison of the criteria==== | ====A comparison of the criteria==== | ||