Sperm Cryopreservation and Semen Banking: A Practical Guide for Andrology Labs

Sperm cryopreservation allows men to store sperm for future use, for example before cancer treatment, and supports IVF, ICSI and donor programmes. A reliable freezing and storage process is an essential service for any andrology laboratory.

Key takeaways

• Common indications include fertility preservation before cancer treatment, backup before surgery and storage of surgically retrieved sperm.
• Freezing uses a cryoprotectant medium, controlled cooling in liquid nitrogen vapour and storage at -196°C.
• Motility falls after thawing, so samples should be frozen in several straws or vials where possible.
• Written consent, infection screening and secure records are essential; in India, donor semen is handled only through registered ART banks.

When sperm freezing is used

• Fertility preservation before chemotherapy, radiotherapy or surgery that may affect fertility
• Surgically retrieved sperm from testicular procedures
• Backup samples when a man may not be available on the day of treatment
• Donor programmes, through registered ART banks

For men facing cancer treatment, fertility preservation should be discussed early, and samples collected before treatment starts.

The freezing process

1. Assessment: a semen analysis records volume, concentration and motility before freezing.
2. Cryoprotectant: the sample is mixed slowly with a commercial cryoprotectant medium.
3. Packaging: the mixture is loaded into labelled straws or vials, with at least two patient identifiers.
4. Cooling: samples are cooled in liquid nitrogen vapour or a controlled-rate freezer, then plunged into liquid nitrogen.
5. Storage: samples are stored at -196°C in monitored tanks.

A small test vial can be thawed to check post-thaw survival.

Thawing

Samples are thawed at room temperature or in a warm water bath, then washed to remove the cryoprotectant. Post-thaw motility is usually lower than before freezing, which affects the choice of treatment, often ICSI.

Screening and storage safety

• Screen for infections such as HIV, hepatitis B, hepatitis C and syphilis before storage
• Consider separate or high-security storage for positive samples
• Monitor liquid nitrogen levels and tank alarms
• Keep a complete storage inventory and audit it regularly

Consent and the law in India

Storage requires written informed consent covering storage duration and what happens to samples in situations such as death or withdrawal of consent. Under the ART (Regulation) Act 2021, donor semen is handled only through registered ART banks, and storage periods are limited by the Act.

Labelling and inventory

Every straw or vial needs at least two unique patient identifiers, the date of freezing and a sample number, written or printed in a way that survives liquid nitrogen. The storage inventory should show exactly which tank, canister and position holds each sample. Audit the inventory against the tanks regularly so that every sample can be found and traced.

Frequently asked questions

How long can sperm be stored?

Frozen sperm can remain viable for many years, but legal storage limits and consent terms apply.

Does freezing damage sperm DNA?

Freezing reduces motility and can cause some damage, but frozen sperm is widely used successfully, particularly with ICSI.

Can a poor-quality sample be frozen?

Yes. Even samples with few sperm may be useful for ICSI.

Learn cryopreservation at ReproNest

ReproNest's Andrology & Semen Analysis Course includes hands-on sperm preparation and cryopreservation practice. Read our sperm DNA fragmentation testing guide, or contact us.

This article is educational content for healthcare professionals and trainees. It is not medical advice and does not replace clinical judgement, current guidelines or the ART (Regulation) Act 2021 and Rules 2022.