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Correct the reticulocyte % for anaemia and maturation time.
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Corrected % = retic % × patient Hct / normal Hct (often 45 %); RPI = corrected % / maturation factor (1, 1.5, 2, 2.5 or 3 by Hct band)
Retic 5 %, Hct 30 % → corrected 3.33 %, factor 2, RPI 1.67
The normal Hct and maturation factors are conventions; some labs use different values. Absolute reticulocyte counts from analysers avoid some of these corrections.
For learning only. Reference intervals vary by laboratory, method and patient group; results are interpreted by qualified professionals with the clinical picture.