Reticulocyte Production Index Calculator
Calculate corrected reticulocyte percentage and reticulocyte production index.
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Corrected reticulocyte percentage
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Reticulocyte Production Index
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Reference Hct: —% · Maturation factor: —
About
The reticulocyte production index (RPI) first adjusts a reticulocyte percentage for the patient's hematocrit, then divides that corrected percentage by a selected maturation factor. The two outputs are distinct. Maturation factors are approximate conventions, and modern laboratories may also report absolute reticulocyte count or immature reticulocyte fraction.
Formula
Interpretation
Worked example: Reticulocytes 6%, patient hematocrit 30%, reference hematocrit 45%, and factor 2 gives corrected reticulocytes 4% and RPI 2.
Reference hematocrit: Enter the reference value appropriate to the laboratory and context rather than assuming one universal normal value.
Limitations: The maturation factor is a semi-quantitative approximation. This calculator reports the arithmetic and does not label marrow response as adequate or inadequate.
FAQ
Disclaimer
Educational and informational reference only. Not intended to replace professional medical advice, diagnosis, treatment, or independent verification.