Calculation
Reticulocyte Production Index is calculated as follows:
1.
A value of 45 is usually used as a normal hematocrit.
2.The next step is to correct for the longer life span of prematurely released reticulocytes in the blood--a phenomenon of increased red blood cell production. This relies on a table:
| Hematocrit (%) | Retic survival (days) = maturation correction |
|---|---|
| 36-45 | 1.0 |
| 26-35 | 1.5 |
| 16-25 | 2.0 |
| 15 and below | 2.5 |
So, in a person whose reticulocyte count is 5%, hemoglobin 7.5 g/dL, hematocrit 25%, the RPI would be:
→ RPI 1.4
Alternatively some books provide the following formula:
Read more about this topic: Reticulocyte Index
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