Table 1: Normal vs. abnormal QT interval discrimination according to QTc (ms) scales proposed by the FDA for non-athletes and Seattle Criteria for athletes.

Proposed by QTc (ms) Male Female
FDA
(for non-athletes)
Long QT >450 >460
Possible Long QT 431-450 451-460
Normal 390-430 390-450
Short QT <390 <390
Seattle Criteria
(for athletes)
Long QT >499 >499
Possible Long QT 470-499 480-499
Normal 321-469 321-479
Short QT <321 <321

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