How are sperm donors for single women chosen?

Esther Marbán, a gynaecologist specialising in fertility at the Tambre clinic in Madrid, tells us how sperm donors are chosen for single women:

Well, according to the spanish reprodution law, all donors (including male and female donors) should look like the patient. I mean, so we look for the most suitable donor for each patient. We do the selection in two different steps. In the first one, we consider the blood type, skin color, hair color, eye color... like the most general characteristics. And then, after having selected the most suitable donors, we use a special technology, called Fenomatch, that will do a facial biometry in terms of finding the most suitable donor for each patient and the perfect match.