The best dry shippers for embryo and sperm transport in UK IVF laboratories in 2026 are the CryoStork V3 for standard inter-clinic transfers, the CryoStork V10 for high-volume or multi-patient loads, and the CryoStork V2 for compact single-patient or courier-based transfers where size and weight are a constraint. All three are supplied by Cryolab and are purpose-built for the specific demands of UK fertility clinic practice – browse the full range at cryolab.co.uk/product-category/dry-shippers/.

Most temperature excursions during embryo transport do not happen in the back of a courier van. They happen in the 15 to 20 minutes before departure, whilst the transfer documentation is being completed with the vessel lid open or partially open. The right dry shipper – properly charged and correctly handled – maintains its vapour phase temperature throughout a full working day without any requirement for additional liquid nitrogen. Choosing the wrong model for your transfer pattern, or not understanding how each one performs under clinical conditions, is where avoidable problems begin.

What makes a dry shipper different from a standard storage dewar?

A dry shipper does not carry free liquid nitrogen. The internal absorbent material is charged with liquid nitrogen beforehand, which then releases nitrogen vapour slowly to maintain the storage temperature throughout transport. The sample sits in the vapour phase at below -150 degrees C – well below the critical threshold of approximately -130 degrees C, below which biological activity effectively stops. This design eliminates the risk of liquid nitrogen spills during transport, which is why dry shippers are IATA-compliant for air freight in a way that standard dewars are not.

The hold time – how long the vessel maintains the required temperature after charging – varies significantly between models, and this is the single most important specification to check against your actual transfer distances and timescales.

CryoStork V3 – the standard choice for most UK inter-clinic transfers

The CryoStork V3 is the most widely used dry shipper for routine embryo and sperm transfers between UK fertility clinics. Its hold time and goblet capacity make it the practical choice for same-day or next-day transfers within the UK, and it handles the vast majority of standard inter-clinic transfer scenarios without requiring any preparation beyond correct charging.

The inversion test is the most commonly skipped step in dry shipper preparation, and it is the one that matters most. If liquid nitrogen runs out when you invert a fully charged CryoStork, it needs more charging time – never assume it is ready based on how long it has been sitting in the nitrogen bath. This single check prevents the majority of hold-time failures we see reported from labs that contact us after a transport incident.

The V3 is right for you when you are transferring between one and three patients per journey, your transfers are typically completed within the same day, and your lab does not require the extended hold time that a larger vessel provides.

CryoStork V10 – for high-volume transfers and longer journeys

The CryoStork V10 is designed for clinics that transfer larger numbers of samples at a time, or for transfers where a longer hold time is required – international transfers, multi-day courier journeys, or situations where the vessel may need to wait before collection. The V10’s larger capacity and extended hold time make it the appropriate choice for sperm banks and fertility groups transferring samples across multiple sites.

If your clinic is expanding its cross-site transfer programme, or if you have experienced hold-time anxiety on longer journeys with a smaller vessel, the V10 removes that concern at the level of the vessel specification rather than requiring you to adapt your transfer logistics around a vessel’s limitations.

CryoStork V2 – compact and lightweight for single-patient and courier transfers

The CryoStork V2 is the smallest vessel in the CryoStork range, designed for single-patient transfers where minimising weight and size is a priority – particularly relevant for courier-based transfers or situations where the vessel will be carried by hand rather than transported in a vehicle. For andrology units sending individual sperm samples to partner clinics, the V2 is often the most practical choice in terms of cost per transfer and ease of handling.

What should IVF labs check before every dry shipper transfer?

Before any transfer, regardless of which CryoStork model you are using, the following checks should be completed. Perform the inversion test – hold the fully charged vessel upside down for 10 seconds and confirm no liquid nitrogen runs out. Verify the temperature with a calibrated data logger if your clinic’s protocol requires it. Record the charge time in your traceability documentation. Confirm that IATA documentation is complete if the transfer involves air freight.

For advice on which CryoStork model is right for your specific transfer requirements, contact Cryolab at cryolab.co.uk/contact-us/ or browse the full dry shipper range at cryolab.co.uk/product-category/dry-shippers/.