{"id":"urine-calcium-24h","name":"Urine Calcium, 24-Hour","shortName":"24-h urine calcium","aliases":["Calcium, 24 Hour Urine","Calcium, 24h Urine","24 Hour Urine Calcium","Calcium, Total 24H Urine","Calcium, 24 Hour, Urine","Calcium, Urine - per 24h","Calcium, 24 HR, U","Calcium, Urine, 24 Hour","Urinary Calcium, 24 Hour","24 Hr Urine Calcium","24-Hour Urinary Calcium","Urine Calcium 24h","Calcium, Urine 24H","Calcium, Urine (24 Hour)"],"abbreviations":["24h UCa"],"loinc":[{"code":"6874-2","primary":true},{"code":"14637-3","primary":false},{"code":"18488-7","primary":false},{"code":"25362-5","primary":false}],"specimen":"urine-24h","units":[{"ucum":"mg/(24.h)","display":"mg/24 h"},{"ucum":"mmol/(24.h)","display":"mmol/24 h"}],"referenceRanges":[{"population":"Men, 18+","low":null,"high":250,"unit":"mg/(24.h)","unitDisplay":"mg/24 h","note":"Mayo Clinic Laboratories prints '<250 mg/24 h' for men 18 and older (no lower limit) in its 24-hour kidney stone profile. Whether 250 itself is inside the limit isn't stated. ARUP and MedlinePlus give 100-250 mg/24 h for adults of both sexes on a usual diet, and ARUP shows lower and higher intervals for low-calcium and high-calcium diets. Cutoffs for 'hypercalciuria' in stone care differ again (see the bands).","sources":[{"title":"Supersaturation Profile, 24 Hour, Urine (Mayo test SUP24)","url":"https://www.testcatalog.org/show/SUP24","publisher":"Mayo Clinic Laboratories"},{"title":"Calcium, Urine (ARUP test 0020472)","url":"https://ltd.aruplab.com/Tests/Pub/0020472","publisher":"ARUP Laboratories"},{"title":"Nutritional Management of Kidney Stones (Nephrolithiasis)","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC4525130/","publisher":"Clinical Nutrition Research","year":2015}]},{"population":"Women, 18+","low":null,"high":200,"unit":"mg/(24.h)","unitDisplay":"mg/24 h","note":"Mayo Clinic Laboratories prints '<200 mg/24 h' for women 18 and older (no lower limit) in its 24-hour kidney stone profile. ARUP and MedlinePlus give 100-250 mg/24 h for adults of both sexes on a usual diet, so labs differ by about 50 mg/24 h for women.","sources":[{"title":"Supersaturation Profile, 24 Hour, Urine (Mayo test SUP24)","url":"https://www.testcatalog.org/show/SUP24","publisher":"Mayo Clinic Laboratories"},{"title":"Nutritional Management of Kidney Stones (Nephrolithiasis)","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC4525130/","publisher":"Clinical Nutrition Research","year":2015}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"How much calcium your kidneys release into urine over a full day. It helps explain kidney stones and calcium or bone problems.","url":"https://bloodtesttracker.com/markers/urine-calcium-24h","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}