Some states in the early 2000s require screening of newborns for CF, using a test known as the IRT test.
2
Ten trailblazer authorities were given £ 1million each to pilot IRT systems.
3
The scale score may be derived one of two ways-a straight score determined by the total number of test items correct or through item-pattern scoring (also called item response theory, or IRT).
4
The test measures immunoreactive trypsin (IRT) assays on blood spots.