As a single option for testing, NutriPATH offer Oxalate screening through either a spot urine or 24 hour urine collection. Oxalate is a natural end product of metabolism in the body. It should leave your body through your urine.
Mitchell T, Kumar P, Reddy T, et al. Dietary oxalate and kidney stone formation. Am J Physiol Renal Physiol. 2019;316(3):F409-F413. doi:10.1152/ajprenal.00373.2018
Sadaf H, Raza SI, Hassan SW. Role of gut microbiota against calcium oxalate. Microb Pathog. 2017;109:287-291. doi:10.1016/j.micpath.2017.06.009