Reticulocyte count blood test
In short
A typical adult reticulocyte count result is 0.6 to 2.71 % (percent of red cells). A high count means the bone marrow is making red cells faster than usual. This is expected after bleeding or during anemia treatment, and can also follow early red cell breakdown. Always read your result against the range printed on your own report.
Young red blood cells, showing how fast new ones are made.
Reticulocytes are young red blood cells, just released from the bone marrow. Their number shows how hard the marrow is working to make new red cells. It helps show whether anemia comes from making too few red cells or losing them.
Is my Reticulocyte count high or low?
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Typical range
| For | Range | Unit |
|---|---|---|
| Adults · percent of red cells | 0.6–2.71 | % |
| Adults | 30.4–110.9 | x10^3/µL |
Typical ranges for adults. Labs differ a little, so the range printed next to your result is the one to go by.
If your Reticulocyte count is high
A high count means the bone marrow is making red cells faster than usual. This is expected after bleeding or during anemia treatment, and can also follow early red cell breakdown.
Common reasons
- Recovery after bleeding or blood donation
- A response to iron, vitamin B12 or folate treatment for anemia
- Pregnancy, or moving to a high altitude
- Red cells breaking down faster than usual (hemolysis)
- Less often: an inherited red cell condition, such as sickle cell disease
If your Reticulocyte count is low
A low count means the bone marrow is making fewer new red cells than usual. With a low hemoglobin, it often points to low iron, vitamin B12 or folate.
Common reasons
- Low iron, vitamin B12 or folate
- Long-term kidney disease, which lowers a hormone that drives red cell production
- Long-term illness or inflammation
- Heavy drinking
- Chemotherapy or other medicines that slow the bone marrow
- Less often: a bone marrow condition
What can throw it off
Recent blood loss, blood donation or treatment for anemia can raise the count within days.
Questions to take to your appointment
- 1Is my marrow keeping up, given my hemoglobin?
- 2Do my iron, vitamin B12 and folate results explain this?
- 3Should we recheck it to see if things are improving?
Read together with
Doctors rarely read Reticulocyte count alone. These usually sit next to it.
- HemoglobinThe protein in red blood cells that carries oxygen.
- MCVThe average size of your red blood cells.
- FerritinThe body's iron-storage protein; its level mirrors your iron reserves.
- Indirect bilirubinThe part of bilirubin the liver has not yet processed.
- LDHAn enzyme found in almost every cell of the body.
Quick answers
What is the reticulocyte count blood test?
Reticulocyte count: Young red blood cells, showing how fast new ones are made. Reticulocytes are young red blood cells, just released from the bone marrow. Their number shows how hard the marrow is working to make new red cells. It helps show whether anemia comes from making too few red cells or losing them.
What is a normal reticulocyte count level?
For most adults, reticulocyte count is typically 0.6 to 2.71 % (percent of red cells). Some countries print it in x10^3/µL, so check the unit first. Labs differ a little, so the range printed next to your result is the one to go by.
What does a high reticulocyte count mean?
A high count means the bone marrow is making red cells faster than usual. This is expected after bleeding or during anemia treatment, and can also follow early red cell breakdown. Common reasons include recovery after bleeding or blood donation; a response to iron, vitamin B12 or folate treatment for anemia; pregnancy, or moving to a high altitude; and red cells breaking down faster than usual (hemolysis). A doctor reads it together with your other results and how you feel.
What does a low reticulocyte count mean?
A low count means the bone marrow is making fewer new red cells than usual. With a low hemoglobin, it often points to low iron, vitamin B12 or folate. Common reasons include low iron, vitamin B12 or folate; long-term kidney disease, which lowers a hormone that drives red cell production; long-term illness or inflammation; and heavy drinking.
What can affect my reticulocyte count result?
Recent blood loss, blood donation or treatment for anemia can raise the count within days.
What should I ask my doctor about my reticulocyte count?
Questions worth taking to the appointment: Is my marrow keeping up, given my hemoglobin? Do my iron, vitamin B12 and folate results explain this? Should we recheck it to see if things are improving?
What this page can’t do
It reads each number on its own.
Doctors read results together — ALT with AST, ferritin with hemoglobin, TSH with free T4. A pattern says more than any single flag.
It doesn't know you.
Your age, your medicines, how you feel and your last result all change what a number means.
It doesn't remember.
Close this page and your results are gone. That's on purpose: nothing was ever sent to us.
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