Waht causes abnormally small sperm heads

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Sperm Morphology (Size and Shape)

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Sperm morphology: Tests and results

This measures many features of the sperm and semen the fluid in which the sperm are contained. The most important of these are the number of sperm sperm count , motility of the sperm percentage of moving sperm , morphology of the sperm percentage of normally shaped sperm , and the volume of fluid. To assess sperm morphology, the sperm are examined under a microscope and the percentage of abnormally shaped sperm is estimated. Sperm morphology is assessed using one of 2 sets of characteristics. Kruger criteria are strict and consider minute irregularities as abnormal. World Health Organization WHO criteria are more lenient and do not classify as many sperm as abnormal. In some cases, morphology is used to decide whether a couple should use in vitro fertilization IVF to attempt a pregnancy.
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Sperm Morphology (Shape): Does It Affect Fertility?

Sperm morphology — the size and shape of sperm — is one factor that's examined as part of a semen analysis to evaluate male infertility. Sperm morphology results are reported as the percentage of sperm that appear normal when semen is viewed under a microscope. Normal sperm have an oval head with a long tail.
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Sperm morphology refers to the shape of the sperm, which includes head size and head DNA content revealed by a nuclear color stain , the midpiece appearance and the structure of the tail. Sperm morphology is assessed during routine semen analysis that examines the sperm cells under a microscope. The semen analysis will also examine the motility movement ability and concentration of sperm present. Every male, fertile or infertile, has varying percentages of abnormally-shaped sperm.
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