{"id":"sodium","name":"Sodium","shortName":"Sodium","aliases":["Sodium","Sodium, Serum","Sodium, Plasma","Serum Sodium","Sodium Level","Sodium (Na)","Serum Na","Na, Serum","Sodium, Whole Blood","Sodium, Venous","Na","Na+","Natrium","Sodio"],"abbreviations":["Na","Na+"],"loinc":[{"code":"2951-2","primary":true},{"code":"77139-4","primary":false},{"code":"2947-0","primary":false}],"specimen":"serum-or-plasma","units":[{"ucum":"mmol/L","display":"mmol/L"},{"ucum":"meq/L","display":"mEq/L"}],"referenceRanges":[{"population":"1+","low":135,"high":145,"unit":"mmol/L","unitDisplay":"mmol/L","note":"Mayo Clinic Laboratories prints 135–145 mmol/L for everyone aged 1 year and older (no sex split), and Labcorp prints 134–144 mmol/L with no age or sex split on its test page, so intervals differ by about 1 mmol/L between labs. Use the range printed on your own report first. Infant intervals are not included here.","sources":[{"title":"Sodium, Serum (test ID NAS)","url":"https://schnecklab.testcatalog.org/show/NAS","publisher":"Mayo Clinic Laboratories (catalog copy hosted by Schneck Medical Center)"},{"title":"Sodium (test 001198)","url":"https://www.labcorp.com/tests/001198/sodium","publisher":"Labcorp"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Sodium is the main salt in your blood. This test shows how well your body balances water and salt.","url":"https://bloodtesttracker.com/markers/sodium","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}