Reticulocyte Count
A blood test that counts young red blood cells, showing how well the bone marrow is making new cells.
Quick Summary
To find the cause of anaemia and monitor treatment.
Percentage or number of reticulocytes.
No preparation needed.
Overview
A high count suggests the marrow is responding to blood loss or red cell destruction.
A low count suggests the marrow isn't making enough cells.
What It Measures
Reticulocytes
Young red blood cells.
How It's Performed
- 01
Preparation
Usually no special preparation. Tell the staff about medicines you take.
- 02
Blood sample
A small amount of blood is taken from a vein in your arm with a thin needle.
- 03
Afterwards
Press on the spot for a minute. A small bruise is common; you can go back to normal activities.
Reference Ranges
Note: Normal ranges vary by laboratory. Consult your report for the specific reference used.
| Parameter | Typical Range (Adult) | Units |
|---|---|---|
| Reticulocytes | 0.5–2.5 | % |
Interpreting Results & Next Steps
Discuss with Doctor
Normal ranges differ between laboratories, ages and sexes; always use the range printed on your report and ask your doctor what your results mean.
If values are Low:
Low counts suggest deficiencies or marrow problems.
If values are High:
High counts suggest bleeding or red cell breakdown, or recovery after treatment.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Reticulocyte Count(opens in a new tab) · MedlinePlus, US National Library of Medicine