“Free Thyroxine (Free T4)” has been added to your cart. View cart “Homocysteine, Plasma” has been added to your cart. View cart “Homocysteine, Plasma” 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 TestingHomocysteine, Plasma $89.00 Add to cart Quick View Quick View Individual TestingCyclic Citrullinated Peptide Antibody (CCP) $149.00 Add to cart Quick View Quick View Individual TestingFree Thyroxine (Free T4) $39.00 Add to cart