the AQHA has just released a new panel test for all genetic diseases found in QH: http://www.aqha.com/News/News-Articles/02082012-AQHA-Animal-Welfare...
I have sadly just put down a filly last week purchased at the legacy sale in 2010 with PSSM. Her name was Revolution Dunit. I am extremely upset and needless to say hurt as my filly was in pain because the breeders (perhaps out of no fault of their own) breed 2 horses which gave a horse who was a carrier of PSSM. We have right now, the tools to make sure we do not RISK even passing these genes on... And why even play russia roulette???