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The Science Behind Sperm Survival: What Happens to Semen at −196°C

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Sperm cryopreservation has been practised since the 1950s. The storage vessel that protects those samples for decades receives a fraction of the attention it deserves. Most people know that sperm can be frozen. Far fewer understand what that actually means at a cellular level — and why the vessel used to store it is as important as the freezing protocol itself. Sperm cryopreservation has been practised since the 1950s. The first human birth from frozen sperm was reported in 1953. Seventy years later, semen storage tanks hold the genetic material of millions of men — cancer patients, donors, servicemen deploying overseas, and partners in IVF programmes worldwide. The science has evolved enormously. The fundamental challenge has not. What Freezing Does to a Sperm Cell A human sperm cell is approximately 50 micrometres long and contains very little cytoplasm — which is an advantage during cryopreservation . Less intracellular water means less ice crystal formation risk during the freez...
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Why the Liquid Nitrogen Tank Is the Most Overlooked Piece of Kit in an IVF Lab

Every IVF clinic obsesses over the freezing protocol. The vitrification kit. The warming solutions. The embryologist’s technique. And rightly so. But here is what keeps the most experienced cryogenic engineers awake at night: the tank. The liquid nitrogen storage tank sits in the corner of every IVF laboratory, every sperm bank, every biobank on the planet. It does not beep. It does not flash. It does not demand attention. And that quiet reliability is exactly why it gets overlooked — until the day it fails. In over 40 years supplying cryopreservation equipment to IVF clinics worldwide, Paul Hague, Director of Cryolab, has seen both sides of that equation. “A liquid nitrogen storage tank is not a sophisticated piece of technology,” he says. “It is a promise. And in reproductive medicine, that promise has to hold for years, sometimes decades.” That promise is worth understanding before you buy. What the Tank Is Actually Doing At -196 degrees Celsius, biological time stops. Enzymes cea...
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What Equipment Does an IVF Lab Actually Need?

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If you work in fertility medicine or are setting up a new IVF clinic, the equipment list can feel overwhelming. Where do you start? What matters most? And who should you trust to supply it? Here is a straightforward breakdown from Cryolab, a UK cryogenic equipment supplier with over 40 years of experience in the IVF sector. Start with consumables Every IVF lab needs consumables every single day. Vitrification straws, cryocanes, goblets, canisters, cryovials, and labelling systems. These are the items that touch your samples directly, so quality is everything. UKCA and CE marked products from a reliable UK supplier mean you never have to worry about stock or compliance. Then think about freezing How are you going to freeze embryos and oocytes? Controlled rate freezers give you a slow, programmable cooling curve. Vitrification kits achieve ultra rapid cooling. Most modern clinics use vitrification as the primary method. Cryolab supplies both. Storage that protects Once frozen, sam...
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Cryolab Founder Has Attended Every ESHRE Since 1985

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  The European Society of Human Reproduction and Embryology (ESHRE) first met in 1985 in Bonn, Germany. Among those present was Paul Hague, now founder of Cryolab. Since that first meeting, Paul has attended every single ESHRE Annual Meeting without missing a year. In 2026, this will mark 42 consecutive years. At the time of the first ESHRE, IVF was still in its early stages. Laboratory methods, cryopreservation systems, and clinical protocols were not yet standardised. Over the decades, the field evolved into a highly structured and regulated discipline. Paul Hague remained closely involved in the industry throughout this entire period. His long-term exposure to laboratory challenges and emerging technologies ultimately led to the founding of Cryolab in the early 2000s. Today, Cryolab supplies cryogenic storage systems, dry shippers, and IVF laboratory equipment used across clinics and research institutions. You can learn more about Cryolab Cryolab will be exhibiting at ESHRE...
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IVF Cryogenic Half Canes and Half Cryosleeves: What Clinics Need to Know

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    In an IVF laboratory, the cryogenic cane is one of the most frequently handled items in the building. Every vitrification procedure ends with a loaded cane going into a canister. Every frozen embryo transfer begins with a cane coming back out. Despite this, canes and cryosleeves often receive far less specification attention than the storage dewars that contain them.   This post covers what half size cryocanes and half PVC cryosleeves are, why format matters, and what to check before ordering.   What is a cryogenic half cane?   A half size cryocane is an aluminium rod at approximately half the length of a standard full-length cane (typically 11.5 inches). Two half cane units stack into the same canister position that one full-length cane would occupy.   Aluminium is the material standard. It offers rapid thermal conductivity when placed in liquid nitrogen, mechanical robustness under routine handling, and universal compatibility with s...
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Practical Guide to Cryogenic Technology, Services and Solutions for Laboratory Professionals

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Cryogenic technology is one of those disciplines where the gap between understanding the concept and understanding what it means in practice is wide enough to create real operational risk. A laboratory that knows liquid nitrogen is cold but does not understand evaporation rate, vacuum failure, supply buffer calculation, or dry shipper charging is a laboratory running a cryogenic programme on incomplete information. This guide covers the operational essentials. What cryogenic technology does to biological material At approximately -130°C, cellular metabolism stops. Enzymatic activity ceases. Biological material enters a preserved state in which degradation effectively does not occur. Liquid nitrogen at -196°C provides a 66°C safety margin below that threshold. Post-thaw embryo survival rates in accredited IVF laboratories using optimised vitrification protocols consistently reach 80 to 95 per cent. That figure is built entirely on maintaining samples below -130°C. The advances that ...
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Practical Guide to Cryogenic Equipment for Laboratories and Fertility Clinics

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Cryogenic equipment is one of those categories where the gap between what a purchasing decision looks like on paper and what it means in practice is unusually wide. A dewar is not just a container. A cryogenic freezer is not just a cold box. The specifications that look similar across competing products can produce meaningfully different outcomes in a working laboratory. This guide covers the essentials. What cryogenic equipment actually is Cryogenic equipment encompasses any device designed to produce, store, transport, or apply materials at temperatures below -150°C. In IVF and biological research, this means equipment using liquid nitrogen at -196°C to preserve embryos, oocytes, sperm, stem cells, and tissue samples. The defining characteristic is passive, power-free temperature maintenance. Vacuum insulation eliminates heat transfer through conduction and convection. A reflective inner surface handles radiant heat. The result is a vessel that holds -196°C for weeks or months wit...
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