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What is the Kruger criteria?
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What is the Kruger criteria?

The Kruger criteria are stricter criteria than those of the World Health Organization (WHO) used to evaluate sperm morphology.

A seminal sample is considered normal when it presents 14-15% of spermatozoa with normal shapes. Instead, the WHO establishes a lower limit of normality, since only 4% is needed.

Therefore, a semen sample with more than 85% amorphous sperm would be diagnosed with teratozoospermia taking into account the Kruger criteria.