Low-power mass interrogation system and assay for determining vitamin D levels

A process for performing tandem mass spectrometry, comprising:

• producing, by an ionization component, sample ions from a sample;
• receiving by an electrostatic analyzer, the sample ions from the ionization component and producing a preferred set of sample ions;
• receiving by a lens assembly, the preferred set of sample ions from the electrostatic analyzer and focusing the preferred sample set of ions;
• receiving, at an entrance of a magnet assembly, the focused preferred sample set of ions and deflecting sample ions within the focused preferred sample set of ions using zero power to a first detector located in a same plane as the entrance to the magnet assembly;
• detecting the deflected sample ions, at a first detector, wherein individual sample ions are deflected to different points along the first detector in accordance with an individual mass thereof;
• fragmenting, by an ion fragmentation component located in a region of the first detector, one or more individual sample ions received at the region of the first detector into fragments and deflecting the fragments, by the magnet assembly, to a second detector located in the plane of the first detector array;
• and
• detecting, by the second detector, the fragments, wherein fragment detection enables identification of individual components within the sample.