• Latest national data: 2010-2011
• Historical national data: 1991 - 2010
• Long term trends in fertility treatment
  • Patients treated
  • Treatments
  • Birth rates
  • Embryo transfer and multiple births
  • Understanding the long-term trends data
• Donation statistics
• Multiple births statistics

 

• Information for 1991 is not included because it relates to only five months of that year (from August onwards).
• Some information relating to treatment cycles carried out in 2007 is included. However, the births information for 2007 is not included because not all births following treatment cycles in 2007 had been reported to the Register when this analysis was carried out.
• Clinics are not always told by every patient the outcome of each treatment cycle, especially if the woman has travelled to the UK for treatment from overseas. A small number of pregnancy outcomes are therefore not included in the Register. However, since most of the pregnancy outcomes are known, it is likely that any underestimate in the outcome rates is very small.
• The information that the HFEA publishes is a snapshot of data provided to us by licensed centres at a particular time. This information may be subject to change as individual centres notify us of amendments. Before publication, we perform a preliminary validation process on the data, and ask the centres to confirm its accuracy, for which they remain responsible.
• The latest validated statistics (including the latest live birth rates) for a complete calendar year are for treatments carried out in 2006. The preliminary data about treatments carried out in 2007 is included for information but, at the time the data was prepared for analysis, had not yet been validated and does not include live birth figures. 

What is SUZI?

In the early 1990s, new IVF treatments were developed which included ‘micromanipulation’ techniques. One of the first of these was a technique called subzonal insemination (SUZI), where a single sperm is inserted part of the way into an egg.

SUZI wasn’t very successful and was soon replaced by a more efficient technique called intra-cytoplasmic sperm injection (ICSI).

• Intra-cytoplasmic sperm injection (ICSI)

ICSI has now completely replaced SUZI. However, when these micromanipulation techniques were first recorded on the HFEA Register, they were both included in the same category. For this reason results are reported for SUZI and ICSI combined. Therefore when ICSI treatment cycles is referred to in the graphs, this also includes SUZI cycles.

In fact very few of these treatment cycles were for SUZI alone and SUZI treatments were only carried out in the early 1990s.

Page last updated: 09 April 2009

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