Overview
If you have started looking into the equipment used during IVF, you may wonder what happens if the temperature inside an incubator changes. It is a common concern, especially when you know that embryos are sensitive to their surroundings. The IVF incubator temperature is usually kept between 36.5°C and 37°C, which is close to the temperature inside the body. Labs check the temperature regularly and use alarms to flag any changes. This means a small or short-term change does not usually mean there is a problem. In this article, we look at why temperature in an IVF incubator matters, what can cause it to change, and how IVF labs deal with these changes.
Table of Contents
- Why Is Temperature Important Inside an IVF Incubator?
- What Is the Ideal Temperature Inside an IVF Incubator?
- What Happens If the Temperature Inside an IVF Incubator Changes?
- How Do IVF Labs Prevent Temperature Changes?
- How Can IVF Lab Conditions Affect Embryo Development?
- What Should an IVF Lab Do If an Incubator Temperature Changes?
- Role of IVF Laboratory Quality Control
- Key Takeaways
Why Is Temperature Important Inside an IVF Incubator?
Embryos need a steady, body-like temperature as their cells divide and grow. Inside each dividing cell is a structure called the spindle, which helps separate the chromosomes. This process can be affected by changes in temperature. If the temperature drops, the spindle may not work as well, which can increase the risk of chromosomes not separating properly. This is one reason an IVF embryo incubator keeps the embryos at a stable temperature.
What Is the Ideal Temperature Inside an IVF Incubator?
The ideal temperature for an IVF incubator is around 37°C. This is close to normal body temperature. Some IVF labs may use a slightly lower setting, such as 36.5°C. A 2019 Cochrane review looked at three trials involving 563 women and found there was not enough evidence to show that using a lower temperature gives better results than 37°C. Therefore, keeping the temperature steady is more important than using one exact number.
What Happens If the Temperature Inside an IVF Incubator Changes?
A temperature change does not necessarily mean that an embryo has been harmed. The size of the change and how long it lasts are both crucial. A 2013 study in the Journal of Assisted Reproduction and Genetics found that an incubator can respond to a change in room temperature within about five minutes. It can also return to its set temperature fairly quickly after a short disturbance, such as opening the door. This is one reason IVF labs try to keep incubator doors closed and only open them when needed.
Effects of Excessive Temperature
If the temperature stays too high for too long, it can affect how embryo cells use nutrients from the culture medium, the fluid that supports their growth outside the body. This may slow the embryo's development as it moves towards the blastocyst stage, which usually occurs around day five. At this stage, the embryo may be suitable for transfer or freezing.
Effects of Low Temperature
A drop in temperature can affect an embryo more quickly, particularly the spindle that helps separate chromosomes as cells divide. Even brief cooling, such as when a dish is taken out for checking, can temporarily affect the spindle's structure. It can usually return to normal once the embryo is warmed again. This is why embryologists try to work quickly and use heated surfaces when embryos need to be handled outside the incubator.
How Do IVF Labs Prevent Temperature Changes?
IVF lab temperature control combines equipment design, room conditions, and constant monitoring:
- Stable room conditions, since room temperature affects incubator stability.
- Individual chamber incubators, so opening one does not disturb every embryo.
- Backup power and gas for continuity during outages.
- Continuous monitoring that alerts staff if a reading drifts, even at night.
- Routine calibration against external thermometers on a fixed schedule.
How Can IVF Lab Conditions Affect Embryo Development?
Temperature is only one part of the environment embryos need. An incubator also controls carbon dioxide and oxygen levels, which can affect the acidity of the culture medium. Air quality matters too. Volatile organic compounds, or VOCs, are gases that can come from things such as paint, cleaning products, skin, and even human breath. If these gases build up in the lab, they may affect embryo development.
What Should an IVF Lab Do If an Incubator Temperature Changes?
If an alarm signals a deviation, the response is to confirm it, fix the cause, and check the embryos:
- Confirm the reading with a second thermometer.
- Find the cause, such as an open door or air conditioning fault.
- Correct it and let the incubator return to its set temperature.
- Record how long and how far the reading moved.
- Check the embryos against what is expected for that day.
Role of IVF Laboratory Quality Control
Quality control catches small issues before they affect a whole batch. ESHRE and Alpha Scientists in Reproductive Medicine, in their Vienna Consensus, recommend tracking equipment against set benchmarks rather than assuming it works just because no alarm has sounded.
Equipment Calibration and Maintenance
Calibration involves checking the incubator against a reliable external standard rather than depending only on the temperature shown on its display. Labs do this regularly, often once a week, to make sure the equipment is giving an accurate reading.
Monitoring Environmental Conditions
Labs also keep an eye on the conditions around the incubator. Room temperature, humidity, and air quality are monitored, and some systems can alert staff if anything moves outside the required range.
Maintaining Safe Laboratory Protocols
Lab procedures also help protect embryos from temperature changes. Staff keep dishes outside the incubator for as little time as possible and use heated surfaces when work needs to be done outside it. In many cases, how the sample is handled can have as much importance as the incubator itself.
Key Takeaways
Embryos need a stable, body-like temperature as they develop and their cells divide. A major or long-lasting change in temperature can interfere with this process. IVF labs adopt several safety measures to keep conditions stable. These include temperature monitoring, regular equipment checks, controlled room conditions, and backup systems. If the temperature moves outside the set range, staff can spot the change and act quickly. In a well-managed lab, most temperature changes are short-lived. They are also dealt with before they are likely to cause a significant problem for the embryo.