My 13 year old daughter was tagged on a EKG machine as being 'borderline Long QT syndrome'. A pediatric cardiologist that my regular doctors office uses looked at it, and deemed it 'normal'. However, to be safe, we decided to be referred to a pediatric cardiologist. We went today, and again the machine did tag her as boderline long QT, but this specialist also corrected it, and said her numbers were normal. She explained to us that this happens alot with children her age, something about how the machine calculates it from the second lead, and it is not an accurate calculation, she explained it in detail, but just to explain quickly. She also had an echocardiogram today, that the doctor told us was completely normal. We don't have any family history that we really know of, other than my Father did die of sudden death when he was 69, but I think his situation was different, because he was suspected of having an infiltrative heart disease such as amyloid, and was having severe symptoms of heart failure. He had many tests in his life, and we never knew him to have Long QT. Anyway, my question is, she mentioned to me today that her corrected OTc was 420, which puts her right in the normal range. This is difficult to look up, and I am wondering, is 420 an ok number, or is that still a bit high? I am wondering if this is the type of test that we would like to see a lower number. Is it considered to be where the lower the better kind of thing, or is 420 right in the right range? I am just wondering if this is average, or it should really be lower at her age. I read a couple things that borderline dosen't start until 440, but one other thing I think said something about 420 starting at borderline. The doctor today seemed to think she was just fine, and gave her the clear to run cross country, and she said she thought that Long QT was something she did not have. Thank you so much!!