Freezing Sperm

Sperm freezing microscope image

Sperm can be preserved by freezing and used for treatment at a later time. There are various reasons why you may feel you need to freeze your sperm, for instance:

How is sperm frozen?

The sperm is analysed, divided into smaller batches and then transferred into vials. The sperm is combined with a cryoprotectant fluid and frozen in liquid nitrogen.

How long can sperm be frozen?

As long as freezing conditions remain at a constant temperature, sperm can survive the freezing process indefinitely. Those sperm that die, do so within the first 48 hours of freezing and the attrition rate is thereafter very slight.


Anyone wishing to freeze his sperm must be tested for HIV, Hepatitis C and Hepatitis B.


The storage of sperm is regulated by the Human Fertilisation and Embryology Authority. The law requires that you consent to the storage of your sperm and its future use. Sperm, once frozen, can only be used for the purposes given in the consent form. The consent can be changed or withdrawn at any point in time by the man.


A free and confidential counselling service is available to patients who are considering sperm freezing.

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CARE Fertility Pioneering Firsts

1978 - World's first IVF baby

1981 - First male factor patient treated

1982 - World's first baby delivered after intrauterine sperm/egg transfer

1984 - World's first baby from blastocyst transfer

1990 - World's first baby born after micro-injection

1992 - Britain's first SUZI treatment baby

1992 - Britain's first "sugar drop" frozen embryo baby

1996 - World's first testicular spermatid baby

2007 - Europe's first baby born following embryo screening using Comparative Genomic Hybridisation (CGH)

2009 - Birth of World's First baby following array CGH screening

2010 - UK's first baby born through PGD for HLA tissue matching

2010 - Blastocyst Chromosome Screening - UK's first baby born

2010 - First multi-factorial genetic chromosome tissue typing and translocation analysis of embryos in an IVF cycle

2010 - First UK based total treatment cycle for PGD and HLA Tissue Matching - Fanconi Anaemia

2011 - First UK pregnancy following use of an Embryoscope

All CARE Fertility Pioneering Firsts

Patient Stories

A CARE patient tells her story

Egg Freezing story