“Celiac Disease A/B Screen” has been added to your cart. View cart “Antinuclear Antibody (ANA)” has been added to your cart. View cart 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 Description Description Magnesium, Serum Related products Quick View Quick View Individual TestingCarcinoembryonic Antigen (CEA) $89.00 Add to cart Quick View Quick View Individual TestingFree Thyroxine (Free T4) $39.00 Add to cart Quick View Quick View Individual TestingC-Reactive Protein (CRP) $60.00 Add to cart