@rudysmom - How did your doctor coach you on taking calcium in your diet and supplements the day you were collecting your urine? Did he/she say to stop calcium? Take calcium as normal? Restrict calcium for a few days??? And yes, reducing sodium is step one for trying to reduce your urine calcium, especially for people with hypercalciuria. Dr. Fredrik Coe has shown this pretty clearly. Attached is a picture showing the relationship of urine sodium (which is driven by daily sodium intake) and urine calcium. Here is the article if you want to go deep into why this happens https://kidneystones.uchicago.edu/2015/08/29/idiopathic-hypercalciuria-ih-general-facts/ .