Embryology as a discipline has transformed dramatically with the development of increasingly sophisticated technologies, the emergence of IVF solution and equipment commercial manufacturers, automation and technological advancements. These developments have reshaped the daily work lives of embryologists. Here’s a brief overview of how this role has developed over the years and how the daily work has changed over the years.  

1978-1980s: The Pioneering Era  

Pioneering work by Patrick Steptoe, Robert Edwards and Jean Purdy: Studies leading to the birth of Louise Brown in 1978 marked the beginning of a new era in reproductive medicine. The success of this procedure was due to the pioneering work of embryologists like Jean Purdy, who is considered one of the first embryologists. 

Early Techniques: In the early days, embryologists focused on refining the basic techniques of IVF including egg retrieval, fertilisation, and embryo culture. The procedures were labour-intensive, often including also preparation of necessary tools and solutions, as there were no commercial suppliers of IVF products.  

1990s: Technological Advancements  

Introduction of ICSI: The 1990s saw the introduction of micromanipulation techniques including intracytoplasmic sperm injection (ICSI), a technique where a single sperm is injected directly into an egg. This advancement required embryologists to develop new skills, but improved success rates for male infertility significantly. 

Cryopreservation: Advances in cryopreservation techniques by slow freezing allowed for the freezing and storage of embryos, which provided more flexibility in IVF treatments and increased the chances of successful pregnancies. This, too, require

 

2000s: Enhanced Culture Systems and Genetic Screening  

Improved Culture Media and Incubators: The development of advanced culture media and benchtop incubators improved the quality of embryo culture, leading to higher success rates. These were accompanied by the emergence of suppliers of standardised, ready-made solutions, removing the need for in-house media manufacturing of media, as well as suppliers of specialised IVF incubators. . 

Preimplantation Genetic Diagnosis (PGD): Embryologists began using PGD to screen embryos for genetic disorders before implantation, which helped in preventing hereditary diseases. The required embryo biopsy techniques introduced yet another skill requirement for IVF embryologists. 

Vitrification: Improved gamete and embryo cryopreservation by vitrification improved success rates but also introduced a new and challenging manual process to the lab, leading to increased demand of highly skilled embryologists.  

2010s-Present: Integration of AI and Advanced Imaging 

Artificial Intelligence: The integration of AI in embryology is revolutionising the field by its promise of automated and standardised data and image analyses. AI algorithms and software solutions can now be used to assess embryo quality and predict implantation success, making the process more efficient and consistent

Time-Lapse Imaging: Advanced imaging technologies, such as time-lapse microscopy, allow embryologists to monitor embryo development continuously without disturbing embryo culture.  

 

Modern Role 

Today, embryologists are integral to fertility clinics, handling gametes (eggs and sperm), performing IVF procedures, monitoring embryo development and interacting with the patients. Their work involves a blend of scientific knowledge, technical skills and empathy, as they help individuals and couples achieve their dreams of parenthood. Despite some of the new technologies seemingly reducing the workload and skills requirements of embryologists, their role continues to be integral. Some of the advantages of recent developments lie in allowing embryologists to focus on tasks requiring human touch while relieving them from routine and monotonous tasks. 

Embryologists’ everyday work practices have been shaped significantly by modern technologies, and this trend is likely to continue as these technologies are adopted more widely and developed further. Some comparisons of the past and present changed work practices include: 

Before Automation: The Manual Era

• Embryo Observation: Embryologists checked embryos manually under a microscope at specific intervals, briefly exposing them to external conditions.  
• Big Box Incubators: Labs relied on traditional incubators with one big temperature and gas-controlled chamber where several patients’ embryos were cultured together, causing exposure to external elements at every door opening.  
• Embryo Selection: Decisions were based on a visual snapshot of embryo development at times fitting laboratory workflow and daily routines. This provided minimal and subjective information, making it harder to predict which embryos were the best ones for implantation.  
• Data Recording: All observations and results were recorded manually and logged by hand, resulting in vast quantities of paper-based documentation with limited accessibility beyond its storage location.   
• Witnessing: Manually double witnessing of procedures requires the presence of minimum of two embryologists in the lab at all times. It caused many interruptions to the embryologists’ workflows increasing the risk of human error.  

Before Automation: The Manual Era

• Time-lapse Incubators: Continuous monitoring and recording of embryo development allows embryologists to track embryo development throughout their culture period without disturbing them. More information leads to better decision making.  
• Stable Environment: While providing more information, timelapse incubators maintain optimal gas, humidity and temperature environment without disturbances, reducing stress on embryos.  
• AI-Assisted Embryo Selection: Artificial intelligence allows embryo assessment in repeatable and consistent manner, helping to identify the most viable embryos based on developmental patterns.  
• Digital Data Management: Daily laboratory operations, observations and results are recorded electronically, streamlining workflow and minimising mistakes, and maintaining an accessible record for auditing, KPI tracking, traceability and research purposes.  
• Witnessing: Unbiased electronic witnessing allows double witnessing to occur without interrupting another embryologist, and provides an unbroken chain of traceability of all steps of any given process. 
• Reduced Burnout: Automation alleviates repetitive tasks, allowing embryologists to focus on complex procedures and patient care.  

Impact of Changing Work Practices on IVF Success Rates  

• Improved Embryo Viability: Time-lapse imaging and AI-driven selection enhance implantation success.  
• More Efficient Workflow: Automation speeds up processes, reducing delays and increasing lab efficiency.  
• Reduction in Errors: Allows embryologist to focus on the science.  

Automation and technological advancements have revolutionized the science behind embryology, making IVF procedures more efficient and precise. These advancements have also reduced stress on both embryologists and the embryos they grow. 

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What is Culture Media? 

Embryo culture media is a specially formulated aqueous solution designed to support the growth and early development of embryos in the laboratory during IVF procedures until they are ready to be transferred to the uterus. It mimics the natural conditions of the female reproductive tract by providing essential nutrients, energy sources, and an optimal balance of pH and osmolality to sustain embryo viability. 

Culture media typically contain: 

• – Carbohydrates (e.g. glucose, lactate, pyruvate) to provide energy. 
• – Amino acids to support protein synthesis and cell function. 
• – A pH buffer to regulate the acidity of the media. 
• – Osmotic regulators to maintain a stable environment. 
• – Other optional components, such as antioxidants to reduce oxidative stress (included in the formulation of the Gems culture media Genea Biomedx). 

The Role of Culture Media in Embryo Development:

Embryo culture media serves as a surrogate environment that mimics the conditions of the female reproductive tract, providing essential nutrients, energy sources, and optimal pH and osmolality for embryo growth. Since early embryonic development is highly sensitive to external conditions, the composition of the media can influence embryo quality, implantation rates, and live birth outcomes. 

Historically, culture media have evolved from simple salt solutions designed for somatic cell culture to complex formulations that support embryos from fertilisation to the blastocyst stage. Modern culture media aim to balance embryo developmental needs while minimising stress and epigenetic modifications. 

Two primary approaches dominate modern IVF laboratories: sequential and one-step culture media. The choice between these approaches depends on various factors, including laboratory preferences, patient characteristics, and technological advancements. 

Sequential Culture Media: Characteristics and Advantages 

Sequential culture media systems use different formulations tailored to the changing needs of the embryo during its development. Typically, one type of medium supports early cleavage-stage embryos, from fertilisation until day 3, while a separate medium is used from that point onwards for blastocyst development. 

Advantages of Sequential Media: 

• Stage-Specific Nutrient Optimisation: Different media formulations can be optimised to match the specific metabolic needs of embryos at different stages. 
• Minimised Metabolic Stress: By providing fresh media partway through development, waste accumulation is reduced, and essential nutrients are replenished. 

Challenges of Sequential Media: 

• Frequent Handling: Media changes require additional handling, increasing the risk of temperature and pH fluctuations that could stress embryos. 
• Increased Labour and Cost: Sequential culture protocols are more labour-intensive and require additional media products, making them more expensive than one-step systems. 
• Potential for Human Error: Each media exchange introduces an opportunity for errors, contamination, or inconsistencies in embryo culture. 

One-Step Culture Media: Characteristics and Advantages 

One-step culture media, also known as single-step or continuous media, are designed to support embryo development from fertilisation to the blastocyst stage without media changes. These formulations contain all necessary nutrients, amino acids, and energy sources in a stable composition and at optimised concentrations, allowing uninterrupted culture. 

Advantages of One-Step Media: 

Reduced Handling and Stress: Since embryos remain undisturbed in the same medium throughout development, exposure to environmental stressors, such as temperature fluctuations and pH changes, is minimised. 

Stable Culture Conditions: Continuous culture provides a stable environment, which may help reduce stress-related developmental issues. 

Simplification of Laboratory Workflow: Eliminating media changes simplifies protocols, reduces labour intensity, and lowers the risk of contamination or errors. 

Potential for Time-Lapse Monitoring: One-step media are the perfect partner for time-lapse imaging systems, allowing non-invasive embryo assessment without the need for media exchange, providing a totally undisturbed culture. 

Challenges of One-Step Media: 

Accumulation of Metabolic By-Products: As embryos grow, they release waste products that can accumulate in static media, potentially affecting embryo development. 

Scientific Perspectives: Which System is Better? 

The debate over one-step versus sequential media remains active, with studies showing varying results depending on laboratory conditions, patient populations, and specific protocols. 

Evidence Supporting Sequential Media: 

Some research indicates that stage-specific culture conditions in sequential media may better mimic in vivo conditions, leading to higher-quality embryos and improved implantation rates. The ability to tailor nutrients and reduce metabolic waste accumulation can enhance embryo viability in some cases. 

Evidence Supporting One-Step Media: 

Other studies suggest that continuous culture in one-step media leads to comparable, if not improved, blastocyst formation rates and pregnancy outcomes compared to sequential media. The reduced handling and stable environment may benefit embryo development, particularly in automated systems using time-lapse imaging. 

Clinical Considerations and Laboratory Preferences 

The choice between sequential and one-step culture media often depends on: 

Laboratory Workflow: Labs equipped with time-lapse incubators may favour one-step media, while traditional setups may benefit from sequential media. 

Patient-Specific Factors: Some patient populations, such as those with poor embryo quality or advanced maternal age, may respond better to specific media formulations. 

Cost and Resource Availability: Budget constraints and laboratory expertise can influence media selection 

Conclusion: Finding the Best Approach 

Both sequential and one-step culture media have their respective advantages and challenges, and there is no universally superior option, as both can successfully support embryo development to the blastocyst stage. IVF laboratories must carefully evaluate their workflows, technological capabilities, and patient needs when selecting culture media. Ongoing research and advancements in embryo culture technology will continue to refine these choices, ultimately improving IVF success rates and patient outcomes. 

Given the lack of consensus on which is the better strategy, many companies offer both options in their portfolio, allowing customers to choose their preferred approach. For example, the Gems media suite by Genea Biomedx offers the Cleavage and Blastocyst Media for a sequential strategy and Geri Medium for continuous culture—specifically designed to be the perfect partner for the Geri incubator with an integrated embryo monitoring system. 

Regardless of the approach, optimising embryo culture conditions remains a cornerstone of IVF success, helping more families achieve their dreams of parenthood. 

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