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Choosing Between Vitrification and Slow Freezing — A Practical View for IVF Lab Managers

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If you manage an IVF laboratory, the vitrification versus slow freezing question is not really a debate any more for most sample types. The clinical evidence settled it some time ago. What remains is making sure the practical implementation in your laboratory reflects that evidence. For oocytes and embryos, vitrification is the method supported by ESHRE guidelines and by the survival rate data accumulated over the past two decades. Oocyte survival consistently exceeds 90% with vitrification in competent laboratories. Blastocyst survival reaches 95% or above. The variability that characterised slow freezing outcomes — particularly for oocytes, where spindle sensitivity made results unpredictable — is largely eliminated when the right technique and consumables are used consistently. The practical requirements for vitrification are straightforward. You need a validated carrier system, vitrification and warming media, and appropriate storage vessels. Consumable standardisation matters mo...
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What the HFEA Requires for Embryo Storage in Liquid Nitrogen - A Practical Overview for Clinic Managers

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If you manage or work in an HFEA-licensed IVF clinic, embryo storage is not just a laboratory function. It is a regulated clinical activity with specific requirements that apply from the moment an embryo enters Cryostorage to the moment it is used in treatment or disposed of in accordance with the patient's consent. This overview covers the practical requirements most relevant to clinic managers and quality teams. The HFEA Code of Practice requires that all embryos stored in licensed clinics are clearly identified and traceable at all times. Every storage straw must be labelled with patient identification before entering storage using cryogenic-grade labelling that will survive years at minus 196 degrees Celsius. Standard adhesive labels will fail at these temperatures. The identification system must allow unambiguous identification of each straw at any point during the storage period. Storage must be in appropriately maintained liquid nitrogen vessels with continuous monitoring...
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The Difference Between a Working Dewar and a Storage Vessel — And Why Your Lab Needs Both

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This is a question that comes up regularly in laboratory procurement: do we need a liquid nitrogen dewar or a cryogenic storage vessel? The answer, for most IVF clinics and research laboratories, is both because they serve completely different purposes. A working dewar  such as a standard 20 litre liquid nitrogen dewar is designed for daily laboratory use. Staff handle it regularly, dispensing LN2 into storage tanks, preparing cryopreservation media, and keeping the lab's cryogenic workflow moving. It needs to be manageable in size, easy to pour from, and robust enough to withstand daily handling. At 20 litres, it sits at the sweet spot of capacity and practicality for most laboratory settings. A storage vessel is designed for something entirely different holding biological samples at -196°C for months or years with minimal intervention. These vessels prioritise insulation efficiency, sample organisation, and long static storage times over ease of handling. Cryolab's CryoCa...
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CryoStork vs CryoNest — Which Cryogenic Vessel Does Your Laboratory Actually Need?

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It is one of the most common questions in IVF and research laboratory procurement — what is the difference between a liquid nitrogen dry shipper and a cryogenic storage vessel, and which one do you need? The answer is simpler than most people expect. The CryoNest® is your on-site storage solution. The 95-litre CryoNest® XL holds significantly more samples than a standard 47-litre tank without increasing your laboratory footprint, with extended hold times and easy sample access built in. It stays in your lab. The CryoStork is your transport solution. Available in 2 to 10 litre capacities, it absorbs liquid nitrogen into its inner lining — meaning no free liquid, no spillage risk, and full IATA compliance for international air freight. It leaves your lab with your samples. The simplest rule: samples staying in your facility go in a CryoNest. Samples leaving your facility go in a CryoStork. Cryolab supplies both ranges worldwide to IVF clinics, fertility laboratories, research facilities ...
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Complete Guide to Oocyte Vitrification UK | Cryolab

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Oocyte vitrification is the gold standard egg freezing technique used by IVF clinics across the UK. Using ultra-rapid cooling at -196°C, vitrification achieves post-thaw survival rates of 80-95% — far superior to older slow-freezing methods. Key equipment for UK IVF labs includes validated vitrification kits such as the CBS HSV Kit, CBS High Security Straws for closed system vitrification, cryogenic storage dewars, and full cryogenic labelling systems for HFEA traceability compliance. All UK fertility clinics performing oocyte vitrification must be HFEA licensed. Closed vitrification systems are increasingly required under HFEA infection control guidelines. Cryolab supplies a complete range of vitrification equipment and IVF consumables to fertility clinics and research laboratories across the UK. Read the complete guide including open vs closed systems comparison, HFEA regulations, post-thaw survival rates, FAQ and equipment recommendations: Full guide → cryolab.co.uk/complete-guide-o...
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Cryogenic Accessories & Supplies Consumables

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  Walk into any serious life science, biobank, or industrial laboratory, and you’ll see that the cryogenic workflow is much more than a single piece of equipment. It is an ecosystem, held together by carefully chosen cryogenic accessories and consumables that make safe, repeatable, and compliant low-temperature work possible. Quick Definition:   “ Cryogenic “  refers to temperatures below −150°C (−238°F). At these extremes, standard lab materials behave very differently, which is why specialist accessories and consumables are essential. Understanding Accessories vs. Consumables Cryogenic accessories are durable, reusable items that support operations over time — insulated gloves, face shields, liquid nitrogen dispensing canes, dewar vessels, storage racks, and transfer equipment. Cryogenic  supplies consumables  are items that are used up and replaced regularly, including cryovials, straws, labels, O-rings, and disposable PPE such as aprons and sleeve protectors...
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What Every IVF Lab Should Know About Sperm Straws

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  When it comes to cryopreservation in an IVF setting, there is no room for compromise. The straws used to store embryos and sperm are not mere consumables they are the last line of defence between a patient’s sample and the outside world. Choosing the right ones matters enormously. This guide covers everything you need to know about high security straws for embryo and sperm storage: how they work, why the CBS design has become the industry benchmark, and what to look for when sourcing embryo storage straws in the UK. What Are High Security Straws? High security straws are specialised cryogenic tubes designed for the long-term storage of biological material — primarily embryos and sperm — in liquid nitrogen (LN2). Unlike standard open-ended straws, high security straws feature a hermetically sealed design that prevents cross-contamination between samples and eliminates the risk of LN2 ingress. This sealed construction is critical in a regulated IVF environment. The Human Fertilisat...
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