ESR/EPR tubes hold samples in ESR or EPR spectrometers ... The degeneracy of the electron spin states characterized by the quantum number, m s =+/- 1/2, is lifted by the use of a magnetic field.

Some hospitals may also use automated methods that measure clumping rather than segmentation. This is the most common ESR method. In this test, blood is drawn into a Westergren-Katz tube until the ...