Christian,
Mark was DX'd in 1982/1983ish time as well. There was always mention of his mutations being Double Delta F508 but we could never find it in his medical records. We told the doctors we were curious (we also told them we wanted the information now that we are married, considering a family, want to identify Mark's mutations so we can test the baby, just to be sure) and they ordered a test of the 25-89 most common mutations. Mark is a Double D F 508. It's a blood test that can be sent to a local laboratory, I am guessing since you were Dx'd in the 80's that you probably have common mutations so you wouldn't need an extended panel (which is more expensive and usually gets denied anyways by ins. co's.)
Good luck, when you get tested, let us know what kind of mutant you are <img src="i/expressions/face-icon-small-smile.gif" border="0">