Blood count
Reticulocytes
LOINC 4679-7 · %
Ranges
Reference range: 0.5–2.5 %
What it is
Reticulocytes are young, newly made red blood cells. This test shows what fraction of your red cells are brand new.
Why it matters
It reveals how actively your bone marrow is producing red cells, which helps explain the cause of an anemia.
What high values can mean
A higher value means the marrow is making red cells quickly, as after blood loss or when an anemia is being treated.
What low values can mean
A lower value means the marrow is making fewer red cells, which can point to a production problem.
How to improve it
The reticulocyte response follows treatment of the underlying anemia rather than lifestyle changes.
Food & lifestyle
Adequate iron, B12 and folate give the marrow what it needs to produce healthy red cells.
Preparing for the test
A blood test often run with a CBC; fasting is not required.
When to talk to a doctor
Interpreted by a doctor together with your hemoglobin to understand an anemia.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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