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Read e-book online Atlas of human sperm morphology evaluation PDF

By T F Kruger; Daniel R Franken

ISBN-10: 1842142771

ISBN-13: 9781842142776

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This may be attrib uted to the fact that spermatozoa with normal acrosomes, but classified as abnormal according to the strict Tygerberg criteria, such as slightly abnormal, slightly and moderately elongated spermatozoa, are more likely to bind to the zona pellucida15,16 and to undergo the acrosome reaction28 compared with the spermatozoa from samples with a low AI (<10% normal acrosomes). 31 found the AI cut­off value to be at 8% normal acrosomes.  Liu and Baker16 found that in cases with <30% morphologically normal spermatozoa (according to WHO criteria), the acrosome status (% normal) was an important prognosticator of expected fertilization in vitro.

The lack of agreement between laboratories has raised an urgent need for the initiation of quality control in andrology23–29.  Andrology technicians should therefore be able to prepare highquality sperm slides in order to (a) provide repeat able and reliable morphology readings to the referring clinicians, and (b) develop an internal qualitycontrol system for sperm morphology.  The ‘feathering’ technique, whereby the edge of a second slide is used to drag a drop of semen along the surface of the cleaned slide to make thin smears of spermatozoa, was used12.

Accordingly, the HZA should be applied first. Men whose specimens show adequate tight binding or penetration under HZA conditions should be examined next for acrosome reaction, oolemma fusion, decondensation, and pronuclear formation in sequence.  completion of capacitation as manifested by the ability to bind to the zona pellucida and to undergo ligand­induced acrosome reaction)18,19,40.  Nevertheless, the implementation of assays using small volumes of human solubilized zonae pellucidae52,56, biologically active recombinant human ZP353–55, or active, synthetic ZP3 peptides57 will probably allow for the design of improved, physiologically oriented acrosome­reaction assays.

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Atlas of human sperm morphology evaluation by T F Kruger; Daniel R Franken

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