For those who care about such questions, the QT can be manually measured and the QTc calculated. Most use the hoary Bazett formula dating from 1920, relating the QT to the square root of the cardiac cycle length. Some are aware of a few other formulas: Fridericia, Hodges, or Framingham. ...
However, the term is widely used in clinical laboratories for test results that indicate an important medical condition (also sometimes referred to as “alarm value”). In this document, the ISO term is replaced by “LoB.” 3.1.2 Nonstandard Use of “Sensitivity” The term “sensitivity” ...