How Do You Select the Right Cryo Tank for a Sperm Bank?

Selecting the right cryo tank for a sperm bank requires a different specification process from selecting for a standard IVF clinic. Sperm banks typically store a larger number of individually small samples from multiple donors or patients over extended periods, with varying access frequencies and a need for robust inventory management. The cryo tank selection criteria for a sperm bank should reflect those operational realities.

What capacity cryo tank does a sperm bank need?

Sperm bank capacity planning starts with the projected sample inventory at the end of the vessel’s service life – not the current caseload. A sperm bank storing 0.3ml or 0.5ml straws can achieve high per-vessel density using half-size cryocane and goblet configurations. Calculating the number of straws per goblet, goblets per cryocane, cryocanes per canister, and canisters per vessel gives the actual storage capacity for the straw format in use.

What hold time should a sperm bank cryo tank have?

A sperm bank should specify a cryo tank with the longest practical hold time available for the vessel size needed. Extended hold times reduce the risk associated with nitrogen supply disruption, reduce the frequency of top-up operations (which introduce warm air into the vessel), and lower the operational burden on staff. Static evaporation rate – expressed as litres per day – is the key specification to compare.

Should a sperm bank use liquid or vapour phase storage?

Both liquid and vapour phase storage are used in sperm banking. Vapour phase storage is sometimes preferred for donor sperm banks processing large donor inventories, as it eliminates the theoretical risk of cross-contamination via liquid nitrogen. In vapour phase vessels, the temperature at goblet height must be verified to confirm it remains below -130 degrees C – temperatures in the upper vapour zone of some vessel designs may approach or exceed this threshold.

A sperm bank that has not mapped the temperature gradient within its vapour phase vessel – from the liquid surface to the top cryocane position – does not know whether all of its stored samples are being maintained below -130 degrees C.

Cryolab advises sperm banks on cryo tank selection and inventory configuration. Contact us at cryolab.co.uk/contact-us/.