Previous Product Next Product Magnesium, Serum $139.00 Evaluate levels of magnesium in the blood (urine) and determine the cause of abnormal magnesium levels. Magnesium, Serum quantity Add to cart Category: Individual Testing Related products Quick View Quick View Individual TestingFerritin $40.00 Add to cart Quick View Quick View Individual TestingCortisol $69.00 Add to cart Quick View Quick View Individual TestingCeliac Disease A/B Screen $159.00 Add to cart