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CHAPTER 5.1<br />

Table 1. Criteria for grading <strong>of</strong> spermatozoa into motility categories based on the 4 th WHO manual<br />

(WHO, 1999)<br />

Grading Category Velocity requirements<br />

a rapid progressive motile ≥25 µm/s<br />

b slow progressive motile < 25 µm/s <strong>and</strong> ≥5 µm/s<br />

c non-progressive motile

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