{"id":"phosphorus","name":"Phosphorus (Phosphate)","shortName":"Phosphorus","aliases":["Phosphate","Phosphorus","Phosphorus, Inorganic","Inorganic Phosphorus","Phos","PO4","Phosphorus, Serum","Phosphate, Serum","Inorganic phosphate","Phosphorus (Inorganic), Serum","Phosphorus, Inorganic, Plasma or Serum","Phosphate (as Phosphorus)","Inorganic Phosphate, Blood","Serum Phosphorus","Serum Phosphate","Phosphorus Level","Phosphorus, Plasma","Fósforo","Fosfato","Phosphat"],"abbreviations":["PO4","Phos"],"loinc":[{"code":"2777-1","primary":true},{"code":"14879-1","primary":false}],"specimen":"serum-or-plasma","units":[{"ucum":"mg/dL","display":"mg/dL"},{"ucum":"mmol/L","display":"mmol/L"}],"referenceRanges":[{"population":"18+","low":2.5,"high":4.5,"unit":"mg/dL","unitDisplay":"mg/dL","note":"Mayo Clinic Laboratories prints 2.5–4.5 mg/dL (about 0.81–1.45 mmol/L) for ages 18 and older, with no sex split. The Merck Manual gives the same adult range and defines low phosphate as below 2.5 mg/dL and high as above 4.5 mg/dL. Labcorp prints narrower adult intervals of 2.8–4.1 mg/dL for men and 3.0–4.3 for women over 19 (its sample report for a 60-year-old man shows the same 2.8–4.1), and ARUP lists its interval as 'by report' because it varies with the instrument, so intervals differ by lab. In chronic kidney disease, KDIGO (2017) suggests lowering elevated phosphate toward the normal range. Use the range printed on your own report first.","sources":[{"title":"Phosphorus (Inorganic), Serum (test ID PHOS)","url":"https://schnecklab.testcatalog.org/show/PHOS","publisher":"Mayo Clinic Laboratories (catalog copy hosted by Schneck Medical Center)"},{"title":"Overview of Disorders of Phosphate Concentration","url":"https://www.merckmanuals.com/professional/nephrology/electrolyte-disorders/overview-of-disorders-of-phosphate-concentration","publisher":"Merck Manual Professional Version","year":2025},{"title":"Hypophosphatemia","url":"https://www.merckmanuals.com/professional/nephrology/electrolyte-disorders/hypophosphatemia","publisher":"Merck Manual Professional Version","year":2025},{"title":"Hyperphosphatemia","url":"https://www.merckmanuals.com/professional/nephrology/electrolyte-disorders/hyperphosphatemia","publisher":"Merck Manual Professional Version","year":2025},{"title":"Phosphorus (test 001024)","url":"https://www.labcorp.com/tests/001024/phosphorus","publisher":"Labcorp"},{"title":"Phosphorus (test 001024), sample patient report","url":"https://files.labcorp.com/testmenu-d8/sample_reports/001024.pdf","publisher":"Labcorp"},{"title":"Phosphorus, Inorganic, Plasma or Serum (test 0020028)","url":"https://ltd.aruplab.com/Tests/Pub/0020028","publisher":"ARUP Laboratories"},{"title":"KDIGO 2017 Clinical Practice Guideline Update for the Diagnosis, Evaluation, Prevention, and Treatment of Chronic Kidney Disease-Mineral and Bone Disorder (CKD-MBD)","url":"https://kdigo.org/wp-content/uploads/2017/02/2017-KDIGO-CKD-MBD-GL-Update.pdf","publisher":"Kidney International Supplements","year":2017}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Phosphorus is a mineral that builds bones and powers cells. Its blood level mostly reflects your kidneys, parathyroid glands, vitamin D and diet.","url":"https://bloodtesttracker.com/markers/phosphorus","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}