Calcium oxalate crystals are among the most common crystals found in urine and are often harmless. They can form in normal urine, especially if it is acidic or concentrated, and are influenced by diet (foods high in oxalate like spinach, nuts, and chocolate). In larger amounts, or in people prone to kidney stones, they matter more, since calcium oxalate is the most common type of kidney stone. Staying well-hydrated is the simplest way to reduce crystal formation. Their significance depends on the overall clinical picture and stone history.
Calcium Oxalate isn't sold on its own. It comes in a routine urinalysis, about $45. A fuller workup adds Vitamin D ($75), hs-CRP ($69), ApoB ($50), and ApoA1 ($50). You can test Calcium Oxalate and 100 other biomarkers for $190 as part of an Empirical membership.
Empirical is FSA/HSA eligible, so you can pay with pre-tax dollars. Fast for 8-12 hours beforehand for the most accurate lipid and metabolic results, and expect results in days rather than weeks.
Calcium Oxalate is drawn at 2,200+ Quest and BioReference patient service centers across the US, so there's usually one within a short drive. Browse the full directory to find the one closest to you.
Test your Urine Calcium Oxalate Crystals and 100+ other biomarkers in a single blood draw.