What is Oxalate and Glycolate Metabolism Markers?
Oxalate is a metabolic end-product arising from multiple precursors — glyoxylate (via alanine-glyoxylate aminotransferase, AGT, in the peroxisome), ascorbate oxidation, hydroxyproline catabolism, and dietary oxalate absorption. The liver is the primary site of oxalate synthesis, with the kidneys excreting it exclusively — renal oxalate accumulation forms calcium oxalate crystals responsible for the majority of renal stones. Primary hyperoxalurias (PH1, PH2, PH3) are rare genetic enzyme defects producing severe urinary oxalate elevation. Secondary hyperoxaluria arises from malabsorption states (enteric hyperoxaluria from fat malabsorption increasing gut oxalate absorption), high-dose vitamin C supplementation (ascorbate-to-oxalate conversion), or high-oxalate dietary intake.