{"id":"normetanephrine-plasma-free","name":"Normetanephrine, Free, Plasma","shortName":"Plasma free normetanephrine","aliases":["Plasma Free Normetanephrine","Normetanephrine, Plasma","Free Normetanephrine","Normetanephrine Free","Plasma Normetadrenaline","Normetanephrine, Pl","Normetanephrine, Free","Free Normetadrenaline, Plasma"],"abbreviations":["fNMN","P-NMN"],"loinc":[{"code":"2669-0","primary":true},{"code":"57462-4","primary":false},{"code":"40851-8","primary":false},{"code":"25489-6","primary":false}],"specimen":"plasma","units":[{"ucum":"pg/mL","display":"pg/mL"},{"ucum":"ng/L","display":"ng/L"},{"ucum":"nmol/L","display":"nmol/L"},{"ucum":"pmol/L","display":"pmol/L"}],"referenceRanges":[{"population":"20–40","low":null,"high":210.1,"unit":"pg/mL","unitDisplay":"pg/mL","note":"Labcorp interval (LC-MS/MS) for blood drawn after at least 20 minutes lying down. Labcorp's upper limit rises with age (210.1 pg/mL at ages 20–40 up to 297.2 above 80). Other labs differ: Quest prints 148 pg/mL or less, Mayo Clinic Laboratories' catalog (2021 copy) listed under 0.90 nmol/L (about 165 pg/mL) and ARUP prints 0.0–0.89 nmol/L (about 163 pg/mL). University Hospitals Birmingham (UK) lists under 730 pmol/L (about 134 pg/mL) for blood drawn lying down and under 1180 pmol/L (about 216 pg/mL) for blood drawn seated. Use the range printed on your own report.","sources":[{"title":"Metanephrines, Fractionated, Plasma Free (test 121806)","url":"https://www.labcorp.com/tests/121806/metanephrines-fractionated-plasma-free","publisher":"Labcorp"},{"title":"Metanephrines, Fractionated, Free, LC/MS/MS, Plasma (test 19548)","url":"https://testdirectory.questdiagnostics.com/test/test-detail/19548/?cc=MASTER","publisher":"Quest Diagnostics"},{"title":"Metanephrines, Fractionated, Free, Plasma (test PMET)","url":"https://www.mayocliniclabs.com/test-catalog/overview/81609/metanephrines-fractionated-free-plasma","publisher":"Mayo Clinic Laboratories"},{"title":"Metanephrines, Plasma (Free) (test 0050184)","url":"https://ltd.aruplab.com/Tests/Pub/0050184","publisher":"ARUP Laboratories"},{"title":"Metanephrines, plasma","url":"https://www.uhb.nhs.uk/services/pathology/tests-and-ordering-draft/pathology-tests-database/clinical-biochemistry/metanephrines-plasma/","publisher":"University Hospitals Birmingham NHS Foundation Trust"}]},{"population":"41–50","low":null,"high":218.9,"unit":"pg/mL","unitDisplay":"pg/mL","sources":[{"title":"Metanephrines, Fractionated, Plasma Free (test 121806)","url":"https://www.labcorp.com/tests/121806/metanephrines-fractionated-plasma-free","publisher":"Labcorp"}]},{"population":"51–60","low":null,"high":244,"unit":"pg/mL","unitDisplay":"pg/mL","sources":[{"title":"Metanephrines, Fractionated, Plasma Free (test 121806)","url":"https://www.labcorp.com/tests/121806/metanephrines-fractionated-plasma-free","publisher":"Labcorp"}]},{"population":"61–80","low":null,"high":285.2,"unit":"pg/mL","unitDisplay":"pg/mL","sources":[{"title":"Metanephrines, Fractionated, Plasma Free (test 121806)","url":"https://www.labcorp.com/tests/121806/metanephrines-fractionated-plasma-free","publisher":"Labcorp"}]},{"population":"81+","low":null,"high":297.2,"unit":"pg/mL","unitDisplay":"pg/mL","sources":[{"title":"Metanephrines, Fractionated, Plasma Free (test 121806)","url":"https://www.labcorp.com/tests/121806/metanephrines-fractionated-plasma-free","publisher":"Labcorp"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Measures free normetanephrine, a breakdown product of norepinephrine, in a blood sample. Doctors use it to look into adrenal gland tumors.","url":"https://bloodtesttracker.com/markers/normetanephrine-plasma-free","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}