ABX PENTRA Magnesium RTU Reagent, Part No. A11A01646 || Product Usage: ABX PENTRA Magnesium RTU reagent with associated calibrators and controls are for quantitative in vitro diagnostic determination of magnesium in human serum and plasma based on a photometric test using xylidyl blue. Magnesium measurements are used in the diagnosis and treatment of hypomagnesemnia (abnormally low plasma levels of magnesium) and hypermagnesemnia (abnormally high plasma levels of magnesium).