The full sequencing can also identify new 'novel variants' which might be eventually classified as mutations (once they're confirmed as disease causing). it goes beyond testing for the 1600 mutations and actually maps out every individual amino acid in the CFTR section of the 7th chromosome. <img src="i/expressions/face-icon-small-smile.gif" border="0"> They found a previously undiscovered variant in me, and also in my daughter. They're not calling it a mutation yet though... ~Juliet