A reticulocyte percentage can look normal in anaemia simply because there are fewer mature red cells. Correcting it shows the true production rate. A corrected count above about 2% in anaemia suggests an adequate marrow response.
How to use the Corrected Reticulocyte Count Calculator
- Sex
- Reticulocytes
- Haematocrit
Results update as you type, and every field accepts the units shown in its menu.
How it works
Enter reticulocytes, the patient’s haematocrit and sex.
Inputs explained
| Field | What to enter |
|---|---|
| Sex | Choose one: Male, Female |
| Reticulocytes | In % |
| Haematocrit | In % |
Example values
How the main result changes when Reticulocytes changes and everything else stays at the example values above:
| Reticulocytes (%) | Corrected reticulocyte count (%) |
|---|---|
| 1.5 | 1 |
| 2.25 | 1.5 |
| 3 | 2 |
| 3.75 | 2.5 |
| 4.5 | 3 |
| 6 | 4 |
Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.
Formula
Corrected reticulocyte count (%) = reticulocytes % × patient Hct ÷ normal Hct (45% men, 40% women)
Worked example
Inputs — Sex: Male; Reticulocytes: 3 %; Haematocrit: 30 %.
Results — Corrected reticulocyte count = 2 %.
Key terms
- Reticulocyte
- Immature red blood cell.
Frequently asked questions
What is a normal corrected reticulocyte count?
About 0.5–2.5% without anaemia; in anaemia, more than 2% indicates a good response.
What is the difference from the RPI?
The RPI further divides by a maturation factor.
Why use a different normal haematocrit for women?
Normal haematocrit is lower in women.