Naturally there are also differences in the chances of success between the different treatment centres (in Belgium and beyond).
For 2015 the Belgian reporting shows a variation in the chances of success between the Belgian centres of 23% to 48% per embryo transfer in the so-called reference group – i.e. women younger than 36 year undergoing their first IVF/ICSI-treatment
Expertise and quality
These differences may concern expertise and the quality of treatment. Although it is difficult to prove, investments in quality management
usually result in higher chances of success.
Selection of patients
Centres do not apply the same standards in terms of the selection of patients either. Some centres will not include or refer patients with a specific medical profile for treatment. And as we already saw, your medical profile – in addition to your age and the number of IVF/ICSI attempts - is an important indicator for your eventual chances of success.
Measurement and interpretation
Many centres express the chance of success as ‘chance of pregnancy’ or ‘chances of progressing pregnancy’. This implies that miscarriages are always included and the figures look better than they are in actual fact.
The chances of success are sometimes also expressed ‘per embryo transfer’. This too could paint a flattering picture of the chances of success, because patients who did not have a transfer – but did start a treatment cycle – are not included. In other words, patients with a worse prognosis – e.g. due to a low number of eggs after retrieval, the lack of fertilisation, a bad embryo development – do not show up in the figures.
This is why the CRG works with a cumulative reproduction of the chances of success, i.e. the chances of success per treatment cycle and across the cycles. This results in a more honest assessment of the chances of success, because on the one hand there is no selection of patients with a better medical profile and on the other hand, the effect of the number of attempts is also included in the calculations.