{"id":"folate-rbc","name":"Folate, Red Blood Cell","shortName":"RBC Folate","aliases":["Folate, RBC","RBC Folate","Red Cell Folate","Erythrocyte Folate","Folic Acid, RBC","Folate (Folic Acid), RBC","Folato eritrocitario","Folate in Erythrozyten","Folate, Red Blood Cell","Red Blood Cell Folate","RBC Folate Level","Folate RBC","Folate (RBC)","Red Cell Folate Level","RBC Folic Acid","Folic Acid (Folate), RBC"],"abbreviations":["RBC folate","RCF"],"loinc":[{"code":"2283-0","primary":true},{"code":"14731-4","primary":false}],"specimen":"red-blood-cells","units":[{"ucum":"ng/mL","display":"ng/mL"},{"ucum":"nmol/L","display":"nmol/L"}],"referenceRanges":[{"population":"Adults","low":280,"high":null,"unit":"ng/mL","unitDisplay":"ng/mL","note":"Quest Diagnostics lists RBC folate above 280 ng/mL (about 634 nmol/L), with no upper limit and no age or sex split. It is a single lower limit that sits well above the commonly used deficiency cutoff of 305 nmol/L (about 135 ng/mL) shown in the bands. Cutoffs depend on the assay, and RBC folate results vary far more between assay platforms than serum folate does, so use the range printed on your own report.","sources":[{"title":"Folate, RBC (test details as listed by Fullscript)","url":"https://us.fullscript.com/labs/quest/folate-rbc","publisher":"Quest Diagnostics"},{"title":"Applying inappropriate cutoffs leads to misinterpretation of folate status in the US population","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC5693380/","publisher":"American Journal of Clinical Nutrition","year":2016}]}],"review":{"status":"ai-draft","label":"AI-drafted. Awaiting verification","lastReviewed":"2026-10-03"},"summary":"Measures the folate stored inside your red blood cells. It reflects your folate status over roughly the past three to four months.","url":"https://bloodtesttracker.com/markers/folate-rbc","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}