What Every IVF Lab Should Know About Sperm Straws

LONDON - Rezul -- 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 Fertilisation and Embryology Authority (HFEA) in the UK mandates strict traceability and containment standards, and high security straws are specifically designed to meet and exceed these requirements.

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How Do They Differ from Standard Straws?

Standard open French straws, whilst still in use in some settings, carry an inherent risk: liquid nitrogen can enter the straw during immersion, creating the potential for sample loss or, in worst cases, cross-contamination. High security straws solve this by sealing both ends after loading, creating a closed system that is far safer and more compliant with modern laboratory standards.

CBS High Security Straws: Industry Standard

CBS (CryoBioSystem) high security straw has established itself as the gold standard in IVF laboratories across the world — and for good reason. Developed with input from leading embryologists, CBS straws combine robust engineering with practical usability for busy clinical and research settings.

Why Embryologists Trust CBS

• Hermetically sealed on both ends after loading, preventing any liquid nitrogen ingress
• Colour-coded by volume for quick identification at the bench
• Compatible with the CBS SYMS sealer for fast, consistent, and reproducible sealing
• Laser-engraved identification capacity for full patient traceability
• Manufactured to ISO standards with full batch traceability
• Resistant to the extreme temperatures of liquid nitrogen storage (−196°C)

These characteristics make CBS straws especially well-suited to NHS fertility units and private IVF clinics that require consistent, auditable results across large volumes of samples.

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CBS Embryo / Sperm Straws – 0.5ml & 0.3ml

Cryolab supplies the CBS Embryo / Sperm Straws in both 0.5ml and 0.3ml volumes (https://cryolab.co.uk/product/cbs-sterile-clear-flexible-and-rigid-embryo-straws-various-capacities/), covering the most common clinical requirements for both embryo cryopreservation and sperm freezing.