Abstract Background Primary hyperoxaluria (PH) is a rare inborn disorder of the metabolism of glyoxylate. which causes the hallmark production oxalate and forms insoluble calcium oxalate crystals that accumulate in the kidney and other organs. Since the manifestation of PH varies from recurrent nephrolithiasis. nephrocalcinosis. https://fitnessgravesyardes.shop/product-category/chest-strap-hr/