Corrected Reticulocyte Count
Enter measured reticulocyte percentage, patient hematocrit, and reference hematocrit (typically 45%) to compute the corrected reticulocyte count.
Adults typically use 45%; adjust for pediatrics or pregnancy.
Corrected reticulocyte count
2.13%
How to Use This Calculator
Start with reticulocyte percent
Obtain the reticulocyte percentage from a CBC with differential or retic panel.
Account for anemia severity
Enter patient hematocrit. Use a reference hematocrit (usually 45%) representing normal RBC mass.
Interpret corrected count
Compare the corrected retic % to thresholds (e.g., <2% inadequate response) to evaluate marrow activity.
Formula
Corrected reticulocyte (%) = Reticulocyte % × (Patient Hct ÷ Reference Hct)
Reference Hct typically 45% (adult). Adjust for pediatric or pregnancy values.
Full Description
Corrected reticulocyte count accounts for anemia severity when evaluating bone marrow response. In anemia, raw retic percentages may be falsely elevated due to reduced total RBC mass. Correcting with patient hematocrit standardizes interpretation, guiding treatment decisions in hemolytic anemia, blood loss, and bone marrow failure syndromes. Further refinement may include the reticulocyte production index (RPI), which adjusts for maturation time.
Frequently Asked Questions
What reference hematocrit should I use?
Adults typically use 45%. Adjust to 40% for women or the lab’s normal range. Pediatric values vary by age.
How is this different from the reticulocyte production index?
RPI further divides corrected retic by maturation time to account for premature retic release, offering refined marrow response assessment.
What does a low corrected retic mean?
Values <2% suggest inadequate marrow response, indicating hypoproliferative anemia or insufficient treatment response.
Can I use hemoglobin instead of hematocrit?
Approximate hematocrit by multiplying hemoglobin by 3 (e.g., Hb 8 g/dL → Hct ~24%).