IVF Knowledge

  If you work in a UK fertility clinic or andrology laboratory, cryogenic equipment maintenance is not optional. It is a documented requirement within the HFEA's regulatory framework, and inspection findings relating to maintenance records are compliance issues that carry real consequences. Liquid Nitrogen Storage Vessels Storage vessels require ongoing performance monitoring even though they have no moving parts. The vacuum insulation layer is what keeps liquid nitrogen at -195.8 degrees C, and it deteriorates over time. The best way to track this deterioration before it becomes critical is to monitor liquid nitrogen consumption against the vessel's rated static evaporation rate. A vessel consuming significantly more than its rated figure is showing signs of vacuum degradation. Frost or condensation on the outer wall is a later-stage indicator that the vacuum has already substantially failed. Every vessel should have a maintenance record from the point of installation ...

This week the XVth International Symposium on Spermatology is running at the University of Birmingham, 29 July to 2 August 2026. Dr Bryan Woodward BSc, MMedSci, PhD, FRCPath, Scientific Director of X&Y Fertility and Fellow of the Royal College of Pathologists, presented poster P32 comparing the SpermScope and Makler against UKNEQAS pre-validated sperm concentration target values. Key results Neither chamber accurate vs UKNEQAS targets (both p less than 0.05). No significant difference between chambers directly (p greater than 0.05). SpermScope R squared 0.77 vs Makler R squared 0.68 against UKNEQAS targets. 72.5 percent of samples within five million per millilitre difference between chambers. Conclusion: The SpermScope could be used instead of the Makler and had a slightly higher correlation to validated target values. Read the full article on Cryolab for the complete methodology, reference list and clinical implications.

The PPE decisions in an IVF laboratory cryogenic work environment are more specific than most lab managers realise when they first encounter them. Here is a straightforward breakdown of what the correct specification looks like for each task category. Gloves: length is the specification that matters Four lengths are available: wrist, mid-arm, elbow and shoulder. The length needed depends entirely on the depth of vessel access involved in the task. Surface handling requires wrist length. Reaching into a working dewar requires mid-arm or elbow length. Accessing the bottom of a deep storage vessel requires elbow or shoulder length. Using wrist-length gloves for deep vessel access leaves the forearm exposed even when the operator believes they are protected. This is the most common PPE specification error in UK IVF cryogenic work. One counterintuitive point worth building into training: cryogenic gloves should be loose-fitting, not tight. A tight glove is harder to remove quickly if li...

Running the consumable supply for an IVF laboratory is one of those jobs that is invisible when it works and catastrophic when it does not. The embryologist does not think about whether the right straw is available until it is not. The HFEA inspector does not ask about your cryogenic markers until one has failed and the sample is unidentifiable. Here is what the decisions actually involve. Straws matter more than most labs realise CBS High Security Straws are the dominant straw format in UK fertility laboratories. The sealed design prevents cross-contamination in liquid phase storage. The colour coding supports patient identification at the individual straw level. The format works for both sperm cryopreservation and vitrification, which means one straw type serves multiple clinical applications — simplifying ordering and reducing training complexity. Vitrification reagents are a matched system Equilibration solution, vitrification solution and warming solution are formulated toget...

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...

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...