{"id":"reticulocytes-percent","name":"Reticulocyte Count (Percent)","shortName":"Retic %","aliases":["Reticulocytes %","Retic %","Reticulocyte Count","Retic Count","Reticulocytes","Reticulocyte Count (%)","Reticulocyte Percent","RET%","Reticulocitos %","Reticulocyte Percentage","Retic Percent","Reticulocytes, Percent","% Reticulocytes","Reticulocytes (%)","Retics %","Reticulocyte Count, Automated","Retic Count, Automated","Retic Auto","Retikulozyten","Reticulocitos","Reticulócitos"],"abbreviations":["RET%","Retic %"],"loinc":[{"code":"17849-1","primary":true},{"code":"4679-7","primary":false},{"code":"31112-6","primary":false},{"code":"17848-3","primary":false}],"specimen":"whole-blood","units":[{"ucum":"%","display":"%"},{"ucum":"[ppth]","display":"‰"}],"referenceRanges":[{"population":"18+","low":0.6,"high":2.71,"unit":"%","unitDisplay":"%","note":"Mayo Clinic Laboratories prints 0.60–2.71% for all adults (flow cytometry). Labs differ: Labcorp's sample report shows 0.6–2.6% (a 26-year-old man), CRMC 0.54–1.94% and Vanderbilt 0.5–1.8% (both Sysmex), and HNL Lab Medicine 0.42–2.23% for men and 0.51–2.17% for women. Healthy Russian adults with a BMI under 28 measured on Beckman Coulter analyzers had 0.54–1.77%. A 1996 study of 1,219 healthy people found different ranges for men and women over age 20. Use the range printed on your own report.","sources":[{"title":"Reticulocyte Profile, Blood (test RETB)","url":"https://www.testcatalog.org/show/RETB","publisher":"Mayo Clinic Laboratories (catalog mirror at testcatalog.org)"},{"title":"Reticulocyte Count (test 005280), sample report","url":"https://files.labcorp.com/testmenu-d8/sample_reports/005280.pdf","publisher":"Labcorp","year":2016},{"title":"Reticulocyte Count (test code Reticulocyte)","url":"https://crmc.testcatalog.org/show/Reticulocyte","publisher":"CRMC Laboratory Test Catalog"},{"title":"Sysmex Complete Blood Count Reference Ranges (March 2024)","url":"https://www.testmenu.com/vanderbiltmedicallabs/TestDirectory/SiteFile?fileName=sidebar%5CVML%20Operations%20Sysmex%20Complete%20Blood%20Count%20Reference%20Ranges.pdf","publisher":"Vanderbilt Medical Laboratories","year":2024},{"title":"Hematology Reference Intervals (updated April 2026)","url":"https://www.hnl.com/HNL/media/Resources/TestDirectory/HNLLabMedicine_1364_HematologyReferenceRange-Intervals_24.pdf","publisher":"HNL Lab Medicine","year":2026},{"title":"Derivation of Russian-specific reference intervals for complete blood count, iron markers and related vitamins","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC11441669/","publisher":"PLoS One","year":2024},{"title":"Reticulocytes: reference limits","url":"https://pubmed.ncbi.nlm.nih.gov/9054713/","publisher":"Clinical and Laboratory Haematology","year":1996}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"The share of your red blood cells that are brand new. It shows how actively your bone marrow is making red cells.","url":"https://bloodtesttracker.com/markers/reticulocytes-percent","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}