Hi Michael
I haven't had any DNA testing done on IRNs myself as with both our birds, the breeder organised it, they just on-charged us. However, i just had a look through a Parrot Society magazine and one of their advertisers does DNA testing. They claim that they are 99% accurate. Their website is
www.mdsaustralia.net. I'm not recommending them as I don't know anything about them. I seem to recall a university in Western Australia has a good reputation for DNA sexing too.
However, if you are looking at buying a bird, I'm sure a reputable breeder or pet store will organise a test for you. Some may also offer surgical sexing which is more accurate but requires the bird undergo anaesthetic.
When we bought our first IRN, we wanted a boy but there was only one boy in the whole litter... and somebody else got in before us... so we took home a girl any way. We love her like crazy but we do find her more temperamental than our male.... so when she's good she's very, very good and when she's naughty, she's very, very naughty!
Best wishes for your IRN selection!
Ellie.