{"id":"calcium-corrected","name":"Calcium, Corrected for Albumin","shortName":"Corrected Calcium","aliases":["Calcium, Corrected","Corrected Calcium","Albumin-Adjusted Calcium","Adjusted Calcium","Calcium (Albumin-Corrected)","Corrected Ca","Calcio corregido","Corrected Calcium (albumin-adjusted)","Calcium, Adjusted","Adjusted Ca","Albumin Corrected Calcium","Calcium, Albumin-Corrected","Calcium Corrected for Albumin","Corrected Total Calcium","Adjusted Total Calcium"],"abbreviations":["Corr Ca","Adj Ca","cCa"],"loinc":[{"code":"46099-8","primary":true},{"code":"29265-6","primary":false}],"specimen":"calculated","units":[{"ucum":"mg/dL","display":"mg/dL"},{"ucum":"mmol/L","display":"mmol/L"}],"referenceRanges":[{"population":"18–59","low":8.7,"high":10.2,"unit":"mg/dL","unitDisplay":"mg/dL","note":"Corrected calcium estimates the total calcium you would have with a typical albumin, so it is read against a total calcium interval. Labcorp prints 8.7–10.2 mg/dL (about 2.17–2.54 mmol/L) for total calcium at ages 18 to 59, for men and women alike. Mayo Clinic Laboratories prints 8.6–10.0 for ages 18 to 59, 8.8–10.2 for ages 60 to 90 and 8.2–9.6 above 90. The Merck Manual gives 8.8–10.4 mg/dL (2.20–2.60 mmol/L) for adults and defines low calcium as below 8.8 mg/dL and high as above 10.4 mg/dL when protein is normal. In Payne's original study the 95% limits of adjusted calcium matched the lab's normal range, and a later study of 1,693 patients found albumin adjustment essential for spotting truly abnormal totals (Payne 1979). The correction is an estimate, and its accuracy is debated (Ladenson 1978; Baird 2011). Labs' urgent-result limits apply to the measured total calcium, not the corrected value (ARUP: below 6.0 or above 13.0 mg/dL; Quest: 6.0 or lower and 13.0 or higher). No lab test page was found that prints a separate interval for the calculated value. Use the range printed on your own report first.","sources":[{"title":"Calcium (test 001016)","url":"https://www.labcorp.com/tests/001016/calcium","publisher":"Labcorp"},{"title":"Basic Metabolic Panel, Serum (test ID BMAMA)","url":"https://schnecklab.testcatalog.org/show/BMAMA","publisher":"Mayo Clinic Laboratories (catalog copy hosted by Schneck Medical Center)"},{"title":"Overview of Disorders of Calcium Concentration","url":"https://www.merckmanuals.com/professional/nephrology/electrolyte-disorders/overview-of-disorders-of-calcium-concentration","publisher":"Merck Manual Professional Version","year":2025},{"title":"Hypocalcemia","url":"https://www.merckmanuals.com/professional/nephrology/electrolyte-disorders/hypocalcemia","publisher":"Merck Manual Professional Version","year":2025},{"title":"Hypercalcemia","url":"https://www.merckmanuals.com/professional/nephrology/electrolyte-disorders/hypercalcemia","publisher":"Merck Manual Professional Version","year":2025},{"title":"Interpretation of serum calcium in patients with abnormal serum proteins","url":"https://pubmed.ncbi.nlm.nih.gov/4758544/","publisher":"British Medical Journal","year":1973},{"title":"Interpretation of serum total calcium: effects of adjustment for albumin concentration on frequency of abnormal values and on detection of change in the individual","url":"https://pubmed.ncbi.nlm.nih.gov/429580/","publisher":"Journal of Clinical Pathology","year":1979},{"title":"Failure of total calcium corrected for protein, albumin, and pH to correctly assess free calcium status","url":"https://pubmed.ncbi.nlm.nih.gov/45478/","publisher":"Journal of Clinical Endocrinology & Metabolism","year":1978},{"title":"Ionized calcium","url":"https://pubmed.ncbi.nlm.nih.gov/21238441/","publisher":"Clinica Chimica Acta","year":2011},{"title":"Critical Values List (CORP-APPEND-0104A, Rev. 46)","url":"https://www.aruplab.com/files/resources/testing/ARUP_Critical_Values.pdf","publisher":"ARUP Laboratories","year":2026},{"title":"Quest Diagnostics Priority Result Reporting Policy (Client Synopsis)","url":"https://www.questdiagnostics.com/content/dam/corporate/restricted/documents/test-center/quest-diagnostics-priority-value-tables.pdf","publisher":"Quest Diagnostics","year":2025}]},{"population":"Men, 60+","low":8.6,"high":10.2,"unit":"mg/dL","unitDisplay":"mg/dL","note":"Labcorp total calcium interval for men over 59. Mayo Clinic Laboratories prints 8.8–10.2 mg/dL for ages 60 to 90 and 8.2–9.6 above 90.","sources":[{"title":"Calcium (test 001016)","url":"https://www.labcorp.com/tests/001016/calcium","publisher":"Labcorp"},{"title":"Basic Metabolic Panel, Serum (test ID BMAMA)","url":"https://schnecklab.testcatalog.org/show/BMAMA","publisher":"Mayo Clinic Laboratories (catalog copy hosted by Schneck Medical Center)"}]},{"population":"Women, 60+","low":8.7,"high":10.3,"unit":"mg/dL","unitDisplay":"mg/dL","note":"Labcorp total calcium interval for women over 59. Mayo Clinic Laboratories prints 8.8–10.2 mg/dL for ages 60 to 90 and 8.2–9.6 above 90.","sources":[{"title":"Calcium (test 001016)","url":"https://www.labcorp.com/tests/001016/calcium","publisher":"Labcorp"},{"title":"Basic Metabolic Panel, Serum (test ID BMAMA)","url":"https://schnecklab.testcatalog.org/show/BMAMA","publisher":"Mayo Clinic Laboratories (catalog copy hosted by Schneck Medical Center)"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Corrected calcium adjusts your total calcium for a low or high albumin level, to estimate what total calcium would be with a typical amount of albumin.","url":"https://bloodtesttracker.com/markers/calcium-corrected","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}