Abstract
Semen analysis is the cornerstone of evaluating male infertility, but it is imperfect and insufficient to diagnose male infertility. As a result, about 20% of infertile males have undetermined infertility, a term encompassing male infertility with an unknown underlying cause. Undetermined male infertility includes two categories: (i) idiopathic male infertility—infertile males with abnormal semen analyses with an unknown cause for that abnormality and (ii) unexplained male infertility—males with “normal” semen analyses who are unable to impregnate due to unknown causes. The treatment of males with undetermined infertility is limited due to a lack of understanding the frequency of general sperm defects (e.g., number, motility, shape, viability). Furthermore, there is a lack of trusted, quantitative, and predictive diagnostic tests that look inside the sperm to quantify defects such as DNA damage, RNA abnormalities, centriole dysfunction, or reactive oxygen species to discover the underlying cause. To better treat undetermined male infertility, further research is needed on the frequency of sperm defects and reliable diagnostic tools that assess intracellular sperm components must be developed. The purpose of this review is to uniquely create a paradigm of thought regarding categories of male infertility based on intracellular and extracellular features of semen and sperm, explore the prevalence of the various categories of male factor infertility, call attention to the lack of standardization and universal application of advanced sperm testing techniques beyond semen analysis, and clarify the limitations of standard semen analysis. We also call attention to the variability in definitions and consider the benefits towards undetermined male infertility if these gaps in research are filled.
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Funding
We would like to thank the University of Toledo for sponsoring S.P. for this project through the Medical Student Research Program. This work was supported by Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD) grant number R03 HD098314.
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Glossary
• Anatomical causes—category within explained male infertility, any defect in or within the anatomy that affects mechanical processes that can lead to male infertility
• Asthenospermia—low motility
• Azoospermia—no sperm in semen
• Category—a broad group in which similar causes are classified together
• Cause—a diagnosable and treatable condition
• Explained male infertility—diagnosable and treatable cause of male factor infertility found, abnormal semen analysis, explained categories include anatomical, hormonal, genetic and environmental
• Extracellular sperm defect—subtype of idiopathic male infertility, an abnormality in the environment that sperm is suspended in (semen volume, viscosity, pH)
• Female infertility—infertility caused by female factors only
• Frequency of sperm defects—percentage of general sperm defects
• General sperm defect—subtype of idiopathic male infertility, an abnormality in the general characteristics of the sperm (count, shape, motility, viability)
• Genetics and environmental causes—category within explained male infertility, genetic abnormalities and/or external biological, chemical and other external factors intertwining to affect processes that can lead to male infertility
• Hormonal causes—category within explained male infertility, any hormonal imbalance leading to processes affecting sperm production, sexual desire, or any other hormonal process that can lead to male infertility
• Hyperspermia—high sperm count
• Idiopathic male infertility—category within male factor infertility, abnormal semen analysis but no demonstrable cause for that abnormality, two subtypes based on location are general sperm defects and extracellular sperm defects
• Infertility—inability to achieve pregnancy after 1 year of regular unprotected sexual intercourse
• Intracellular sperm analysis—a group of diagnostic tests that are able to detect intracellular sperm components such as chromosomes and centrioles
• Intracellular sperm defect—an abnormality inside of the sperm (DNA, RNA, centrioles, reactive oxygen species)
• Male infertility—a term that encompasses male factor infertility and unexplained male infertility
• Male factor infertility—infertility caused by male factors only, abnormal semen analysis
• Necrospermia—dead sperm in semen
• Oligospermia—low sperm count
• Prevalence of male infertility causes—percentage of causes of male infertility
• Teratospermia—abnormal sperm morphology (shape)
• Undetermined male infertility—infertile males with unknown causes, this class includes idiopathic male infertility and unexplained male infertility
• Unexplained couple infertility—no evidence of male or female infertility found
• Unexplained male infertility—males with unexplained couple infertility, normal semen analysis
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Highlights
• Semen analysis is limited and insufficient for evaluation of male infertility.
• One-fifth of infertile males have no identified cause for their infertility (undetermined male infertility).
• Intracellular sperm analysis can help resolve undetermined male infertility and improve treatment.
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Pandruvada, S., Royfman, R., Shah, T.A. et al. Lack of trusted diagnostic tools for undetermined male infertility. J Assist Reprod Genet 38, 265–276 (2021). https://doi.org/10.1007/s10815-020-02037-5
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DOI: https://doi.org/10.1007/s10815-020-02037-5