Freezing a Backup Sperm Sample Before IVF or IUI

A frozen backup sample gives an IVF or IUI cycle a fallback if no usable specimen can be produced on the day; here is what the evidence says about thawed sperm, vials and cost.

Key takeaways

• A backup sample is a semen specimen cryopreserved before egg retrieval so the cycle can go ahead if no usable fresh specimen is produced on the day. NHS units such as UHCW in Coventry and Cambridge IVF offer it to cover the risk of no sample on the day, travel or absence.
• For ICSI, large studies found small or no differences between thawed and fresh ejaculated sperm. In 44,423 oocyte-donation ICSI cycles (Gil Julia et al., Human Reproduction, 2024), the live birth rate per first embryo transfer was 41.67% with fresh sperm and 37.10% with frozen, a difference the authors judged to have limited clinical impact. For conventional IVF, a 2024 matched study (Xie et al., Frontiers in Endocrinology) found live birth rates per frozen blastocyst transfer of 42.4% and 40.3%, not statistically different.
• IUI is the treatment most affected. In 5,335 IUI cycles (Cherouveim et al., Frontiers in Reproductive Health, 2023), the total motile count averaged 14.3 million with frozen sperm against 65.0 million with fresh, and time to pregnancy was longer (3.84 versus 2.58 cycles).
• Guidance for donor-sperm vials (Everleap Fertility, 2026): one vial per IUI cycle and two to four per intended pregnancy; for IVF and ICSI a single vial can often be divided.
• Published fees run from a free first year of storage at one NHS unit to £300 at Cambridge IVF, CA$700 per sample at the MUHC in Montreal and US$375 to US$485 per specimen at Fairfax Cryobank, plus storage (as of October 2026).
• If the ejaculate contains no sperm, testicular sperm extraction (TESE) is an option. A 2018 meta-analysis (Yu et al., Journal of Assisted Reproduction and Genetics) found no statistically significant difference in live birth rate per ICSI cycle between fresh and frozen-thawed testicular sperm in men with nonobstructive azoospermia.

Why clinics freeze a backup sample before egg retrieval

An IVF or ICSI cycle is built around one appointment. Egg retrieval is scheduled to the hour after the trigger injection, and the laboratory needs a semen sample the same day. If no usable specimen is available at that point, weeks of stimulation medication are put at risk.

The HFEA, the UK fertility regulator, lists difficulty producing a sample on the day of fertility treatment as a reason to freeze sperm, alongside a low sperm count or deteriorating sperm quality. The patient leaflet from University Hospitals Coventry and Warwickshire (UHCW) describes backup storage as a response to the increased risk of no sperm or no sample being produced on the day of egg collection, and adds that a backup may also be needed before travel abroad or absence on the day. Cambridge IVF gives similar examples: being away when treatment is scheduled, or worry about producing a sample on the day.

In practice, a backup is usually discussed when:

• You have had trouble producing a specimen under time pressure before, for example at a diagnostic semen analysis.
• You may be traveling, on call, or otherwise unable to attend on retrieval day.
• Your semen analysis showed a low count or declining quality.
• There is a risk of azoospermia (no sperm in the ejaculate), so surgical retrieval may need to be planned in advance (see below).

The UHCW leaflet notes that people who store sperm as a backup often never need to use it. That is the point: the sample is insurance. It is easier to raise with your fertility specialist at the planning consultation than on the morning of retrieval.

How a backup sample is collected, screened and timed

The process is the same sperm cryopreservation procedure used for any other reason, compressed into the IVF timeline.

1. Screening bloods. The HFEA says testing for infectious diseases such as HIV and hepatitis comes first; the UHCW unit screens for HIV, hepatitis B and hepatitis C before the freezing appointment. According to the HFEA, a positive result does not stop you from freezing; such samples are stored separately.
2. Consent and identification. You sign consent forms covering how long the sample is stored and how it may be used, and UHCW also asks for photographic ID.
3. Collection. The specimen is produced by masturbation into a sterile container at the clinic, after the abstinence period your clinic specifies.
4. Processing and freezing. The laboratory mixes the semen with a cryoprotectant, divides it into straws so that not everything has to be thawed at once, cools it slowly and stores it in liquid nitrogen.
5. Storage. The UHCW unit stores backup samples for one year and can extend storage in certain circumstances.

Timing is set by the clinic. At UHCW the screening bloods are arranged before the freezing appointment, and the leaflet states that one sample is usually sufficient but that further samples may be requested if necessary, so it is worth asking how far ahead of egg collection your clinic wants the backup produced.

A backup is held in reserve in case a fresh specimen is not available, but policies on the day itself differ, so ask how your unit handles it. Our questions to ask your clinic guide has a checklist for the consultation.

How thawed sperm performs in IVF and ICSI

The HFEA’s sperm freezing page says “IVF using frozen sperm is just as successful as IVF using fresh sperm”, without giving a figure, and notes that not all sperm survive freezing and thawing. Recent large studies put numbers on the comparison, and the results depend on which outcome is measured.

The authors of the 44,423-cycle analysis describe it as, to their knowledge, the largest of its kind. Because every cycle used donor oocytes, differences between groups are more likely to reflect the sperm than the eggs. Frozen ejaculated sperm was associated with a statistically significant but small reduction in pregnancy and live birth rates per transfer: couples using frozen sperm needed on average 0.54 more oocytes, 0.45 more embryos and 0.41 more transfers to reach a live birth, while the cumulative live birth rate per oocyte was not significantly different. The authors concluded that the decrease could be clinically overlooked in favor of the many benefits of sperm cryopreservation.

The 2023 study looked only at men with a normal semen analysis: the live birth rate per cycle was 35.8% with fresh and 33.3% with frozen sperm, a difference that was not statistically significant after adjustment. For conventional IVF followed by frozen blastocyst transfer, the 2024 Shanghai study found lower motility in the frozen group (75.70% versus 82.04%) but no significant difference in fertilization, clinical pregnancy, live birth or the neonatal outcomes it measured.

Two cautions apply. All of these are retrospective studies, so unmeasured differences between couples may contribute to the results, and none of them predicts the outcome of any individual cycle. For a deeper comparison across treatment types, see frozen vs fresh sperm success rates.

Why IUI is more sensitive to freezing

Freezing kills a share of sperm and reduces motility in the survivors; our guide on whether freezing damages sperm covers the mechanism. In ICSI that matters less, because the embryologist selects a single sperm for each egg. In IUI it matters more, because the sperm placed in the uterus must reach and fertilize the egg on their own.

The Cherouveim analysis of 5,335 IUI cycles at Massachusetts General Hospital (2023) shows the effect. Mean motility was similar in both groups (52.7% frozen versus 52.6% fresh), but the total motile count averaged 14.3 million with frozen sperm versus 65.0 million with fresh. The unadjusted clinical pregnancy rate per cycle was 9.4% frozen versus 13.0% fresh, time to pregnancy was longer (3.84 versus 2.58 cycles), and in cycles using oral ovulation medication the adjusted odds of clinical pregnancy were lower with frozen sperm (OR 0.49, 0.25 to 0.95). Across the whole cohort, the adjusted difference was not statistically significant (OR 0.77, 0.57 to 1.03).

One caveat: about 96% of the frozen-sperm IUI cycles in that study used donor sperm, so the comparison is mostly donor vials against fresh partner samples. In a subanalysis limited to partners’ sperm, the authors found no difference in clinical pregnancy. If your backup might be used for IUI, ask the laboratory for a post-thaw motile count per straw.

How many vials you need per attempt

Everleap Fertility’s guidance on donor-sperm vials (2026) gives a rough guide. A partner’s backup is usually divided into straws rather than vials, so the laboratory can say how many one attempt needs:

For a backup before IVF or ICSI, one well-frozen specimen is therefore often enough, which matches the UHCW statement that one sample is usually sufficient. If IUI might be used later, or straws might be wanted for a later attempt, ask whether to store more than one sample. Our guide on how many samples to freeze works through the arithmetic.

What a backup sample costs

Pricing varies because some clinics treat the backup as part of the treatment cycle and others bill it as a separate cryopreservation service. The figures below come from published fee schedules and patient leaflets.

Before you pay, ask whether the freezing fee includes the infectious-disease bloods and a post-thaw check, and confirm what happens when the first year of storage ends. If you are paying for the cycle privately, ask for the backup as a line item so you can compare it with the cost of sperm freezing elsewhere, and use the cost calculator to add storage years.

If there is no sperm in the ejaculate: TESE before IVF

Some men planning IVF learn at the semen analysis that the ejaculate contains no sperm. Azoospermia does not necessarily mean no sperm is being produced, and sperm may still be retrievable surgically from the testicle. ASCO’s fertility-preservation guideline update for people with cancer (Su et al., Journal of Clinical Oncology, March 2025) now includes testicular sperm extraction (TESE) as a standard-of-care option for men unable to produce a semen sample.

For IVF planning, the question is whether to retrieve sperm fresh on the day of egg retrieval or to retrieve and freeze it in advance. One argument for freezing first is that, if the retrieval finds no sperm, the couple learns this before the partner goes through stimulation. A 2018 systematic review and meta-analysis (Yu et al., Journal of Assisted Reproduction and Genetics) of 17 retrospective studies covering 1,261 ICSI cycles in men with nonobstructive azoospermia reported live birth rates per cycle of 23.5% with fresh testicular sperm and 20.5% with frozen-thawed, a relative risk of 1.11 (95% CI 0.88 to 1.41) that was not statistically significant. Fertilization (RR 1.02) and clinical pregnancy (RR 1.03) were also similar.

Surgical retrieval is a urological procedure with its own risks and recovery time, and the choice between fresh and frozen retrieval depends on the cause of the azoospermia and the clinic’s laboratory. A urologist with andrology training, working with your fertility specialist, can walk you through it.

Deciding whether a backup is right for you

A backup sample is inexpensive relative to an IVF cycle, involves no procedure beyond a blood test and producing a sample, and often goes unused. The case for it is strongest when retrieval day is uncertain for any reason: previous difficulty producing a specimen, travel, a low count, or a history of illness. The case against it is mostly cost and extra appointments in a crowded schedule.

Whatever you decide, the consent form is where to record whether the fresh specimen or the frozen straws should be used first, what should happen to unused straws, and how long storage should continue. If you are weighing freezing for reasons beyond this cycle, our decision quiz can help.

This guide is general information, not medical advice. Decisions about fertility treatment should be made with your fertility specialist or urologist, who know your results and your clinic’s protocols.