Calcium (Alpha Diagnostics, arsenazo III method, reagent composition: TRIS buffer pH 8.5; arsenazo III, 8-hydroxy-quinoline-5-sulfonic acid, inactive stabilizers and detergents 630–670 nm);
Magnesium (Alpha Diagnostics Magnesium Xylidyl Blue, reagent composition: trioglycolic acid, DMSO, Xylidyl Blue, measurement at 550 nm);
Phosphorus (Alpha Diagnostics, direct method with phosphomolybdate, reagent composition: sulfuric acid, ammonium molybdate, measurement at 340 nm).