From the way that our Dr explained it, in California they do the IRT twice and when it's elevated it goes straight to screening for the "California 40"--the 40 most common mutations in California. If it detects one of them, it then goes to full DNA sequencing which then sometimes brings stuff "they've never even seen before"--in our case it detected the i1366T-an unknown sequence change that has been documented once in an asymptomatic carrier. Do you know if they went beyond your state's most common mutations?