{"id":"potassium","name":"Potassium","shortName":"Potassium","aliases":["Potassium","Potassium, Serum","Potassium, Plasma","Serum Potassium","Potassium Level","Potassium (K)","K, Serum","Potassium, Whole Blood","Potassium, Venous","K","K+","Kalium","Potasio"],"abbreviations":["K","K+"],"loinc":[{"code":"2823-3","primary":true},{"code":"77142-8","primary":false},{"code":"6298-4","primary":false}],"specimen":"serum-or-plasma","units":[{"ucum":"mmol/L","display":"mmol/L"},{"ucum":"meq/L","display":"mEq/L"}],"referenceRanges":[{"population":"1+","low":3.5,"high":5.2,"unit":"mmol/L","unitDisplay":"mmol/L","note":"Labcorp prints 3.5–5.2 mmol/L for anyone over 1 year old. Mayo Clinic Laboratories prints 3.6–5.2 mmol/L for age 1 year and older, so the low end differs by lab. Serum reads up to about 0.4 mmol/L higher than plasma. Use the range printed on your own report first. Infant intervals are higher (Labcorp lists up to 6.4 mmol/L in the first month) and are not included here.","sources":[{"title":"Potassium (test 001180)","url":"https://www.labcorp.com/tests/001180/potassium","publisher":"Labcorp"},{"title":"Potassium, Serum (test ID KS)","url":"https://schnecklab.testcatalog.org/show/KS","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":"Potassium is a mineral that helps your nerves, muscles and heart work. This test shows how much is in your blood.","url":"https://bloodtesttracker.com/markers/potassium","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}