{"id":"reticulocyte-hemoglobin","name":"Reticulocyte Hemoglobin Content (CHr / Ret-He)","shortName":"Ret-He","aliases":["Ret-He","CHr","Reticulocyte Hemoglobin Equivalent","Reticulocyte Hemoglobin Content","Reticulocyte Hemoglobin","Retic Hgb","RET-He (pg)","Reticulocyte Hgb Content","Ret-He (pg)","CHr (pg)","Reticulocyte Hemoglobin Equivalent (Ret-He)","Reticulocyte Hemoglobin Content (CHr)","Reticulocyte Hb","RET-He","Ret He","RET-HE","Hemoglobin Content of Reticulocytes","Reticulocyte Hemoglobin Expression","RHe","Retic Hemoglobin"],"abbreviations":["Ret-He","CHr","RET-He","RHe"],"loinc":[{"code":"71694-4","primary":true},{"code":"42810-2","primary":false}],"specimen":"whole-blood","units":[{"ucum":"pg","display":"pg"}],"referenceRanges":[{"population":"18+","low":30,"high":37.6,"unit":"pg","unitDisplay":"pg","note":"Mayo Clinic Laboratories prints 30.0–37.6 pg for adults of both sexes. Other labs: Vanderbilt (Sysmex Ret-He) 29.8–40.4 pg for men and 30.1–39.8 pg for women; OHSU 29–38 pg (all ages, both sexes); QEHB 25.9–38 pg. Ret-He (Sysmex), CHr (Siemens ADVIA) and RHe (Mindray) measure the same idea on different analyzers and are not fully interchangeable, so 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":"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":"Heme Reference Ranges (updated 6/5/18)","url":"https://www.ohsu.edu/sites/default/files/2019-07/cbcrefrange.pdf","publisher":"OHSU Laboratory Services (Oregon Health & Science University)","year":2018},{"title":"Haematology Adult Reference Ranges (HAE.N002, PUB_040)","url":"https://qehbpathology.uk/images/files/PUB_040.pdf","publisher":"QEHB Pathology","year":2026}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"How much hemoglobin is in your newest red blood cells, in picograms (pg). It reflects the iron available to your bone marrow over the last few days.","url":"https://bloodtesttracker.com/markers/reticulocyte-hemoglobin","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}