Daron: I really hope that the test results are good news for you, I am going through the same thing here:( AND it seems the Icelandics are the ones affected most by whatever they have:*(. Trying to find a vet to run some tests to determine the cause, but my normal "companion animal" vet wanted $150+ to send samples out to a lab. That just sounds a bit ridiculous! So I will see what another vet can do tomorrow.
Really breaks my heart to think of having to cull EVERYONE. Not only the Icelandics, but a couple of my old ladies from my first batch of chicks ever.