Reticulocyte Production Index (corrected retic)
Reticulocyte production index: corrected retic and RPI using a maturation factor from hematocrit; RPI <2 inadequate marrow response.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Reticulocyte
- 5 %
- Hematocrit
- 30 %
Result: Corrected retic 3.33%, RPI 2.22 (adequate marrow response).
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Reticulocyte
- Hematocrit
How this is calculated
Hillman RS, Finch CA. Red Cell Manual. 7th ed. FA Davis, 1996 (maturation-correction factors). Corrected retic = retic% x (Hct/45); RPI = corrected retic / maturation factor.
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.