Mass spectrometry (MS) is becoming increasingly prevalent in laboratories as a method of measuring small molecules, such as steroids, as well as other analytes, like biogenic amines. Distinguishing ...

Stable isotope-labeled internal standards are widely used in laboratory-developed clinical mass spectrometry tests. An equal amount of these internal standards is added to all samples in a batch, ...

Kenjerić's starting point was a routine method that required two 20.5-min high performance liquid chromatography (HPLC) runs ...