Sperm Morphology Assessment in Assisted Reproductive Technologies
Summary
Sperm morphology assessment remains a cornerstone of male fertility evaluation and a critical determinant in the selection of assisted reproductive techniques. Standardised criteria established by the World Health Organization and Kruger’s strict morphology guidelines define normal form by precise measurements of head, midpiece and tail dimensions. Conventional assessment relies on fixed staining and bright field microscopy, yet this approach can be time-consuming and subject to inter-observer variability. Emerging automated systems and advanced imaging modalities seek to improve objectivity by quantifying head shape, surface irregularities and acrosomal integrity. Morphological anomalies such as teratozoospermia are associated with reduced fertilisation potential, altered pronuclear morphology and delayed embryonic cleavage. Precise morphometric evaluation not only guides the choice between conventional in vitro fertilisation and intracytoplasmic sperm injection but also informs prognostic counselling for couples worldwide.
Research from Nature Portfolio
No recent Nature Portfolio content available.
Sperm Morphology Assessment in Assisted Reproductive Technologies publication trend
The graph below shows the total number of articles in sperm morphology assessment in assisted reproductive technologies across all publications each year (not limited to Nature Index journals).
Technical terms
Intracytoplasmic sperm injection (ICSI): A micromanipulation technique in which a single spermatozoon is injected directly into an oocyte cytoplasm to achieve fertilisation.
Quantitative phase microscopy (QPM): An imaging modality that measures optical phase shifts in unstained cells to compute three-dimensional morphometric parameters without chemical labels.
Normal sperm morphology rate (NSMR): The percentage of spermatozoa exhibiting normal form under strict morphological criteria, used to categorise teratozoospermia severity.
Teratozoospermia: A condition characterised by a high proportion of abnormally shaped spermatozoa, often associated with impaired fertilisation capacity.
References
- Stain-Free Sperm Analysis and Selection for Intracytoplasmic Sperm Injection Complying with WHO Strict Normal Criteria. Biomedicines (2023).
- Severe teratozoospermia and its influence on pronuclear morphology, embryonic cleavage and compaction. Reproductive Biology and Endocrinology (2011).
- Are sperm parameters able to predict the success of assisted reproductive technology? A retrospective analysis of over 22,000 assisted reproductive technology cycles. Andrology (2021).
- Probing the Effect of Human Normal Sperm Morphology Rate on Cycle Outcomes and Assisted Reproductive Methods Selection. PLOS ONE (2014).
About these summaries
This Nature Research Intelligence Topic summary is created with the cited references and a large language model. We take care to ground generated text with facts, and have systems in place to gain human feedback on the overall quality of the process in line with our AI principles. We strive to create accurate and useful summaries for people unfamiliar with the research topic and that supports this goal. These pages are a beta release and will be updated as we learn how best to help people gain value from a research topic summary.
Turn complex research questions into confident strategic decisions
When you're under pressure to set direction, justify investment, or understand your competitive position, you need more than raw data — you need trusted insights you can act on.
Benchmark your performance against global peers using robust, methodologically sound analysis.
Combine quantitative metrics with qualitative expert insight to uncover strengths, gaps and emerging opportunities.
Gain tailored, decision-ready recommendations aligned to your strategic priorities.
Talk to us to learn more about our data dashboards and bespoke strategy reports.
Grow research skills, confidence and careers with training built for every stage of the research lifecycle.
Developed with Nature Portfolio journal Editors and internationally renowned experts. Discover three ways to learn:
Self-paced, online courses in convenient bite-sized units, covering key skills across scientific writing, publishing, grant writing, data analysis, and more.
Expert trainer-led workshops with hands-on exercises and real-time feedback across core research skills, delivered via interactive group sessions.
Editor-led workshops combining core principles in writing and publishing, personalised 1:1 feedback from Nature Portfolio Editors and hands-on exercises.
Explore course catalogues and workshop agendas, enquire about the options or request institutional pricing.