Forbidden to donate blood because non-Norwegian speaking.

Help me understand the logic. I was gonna donate blood and was forbidden to donate blood on the basis that I don't speak Norwegian yet. I've been here a little less than a year and my Norwegian is not quite there yet, but I get buy easy and can use Google translate when I need.

I'm European and have a rare blood type. I was never forbidden to donate blood before, even if I didn't speak the language of the country.

Is that discrimination or what's the logic?