Absolute Reticulocyte Count (ARC) Calculator

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The reticulocyte percentage reported by the complete blood count (CBC). Normal adults: 0.5-2.5%.
%
The patient hematocrit (packed cell volume). Used to correct the reticulocyte percentage for the degree of anemia.
%
The normal hematocrit for comparison. Commonly 45% for adults (use 36% for adult females if preferred). Adjust to match your laboratory reference.
%
Optional: enter the RBC count for a direct calculation of ARC. If left blank or zero, the Hct-based formula is used instead.
x10⁶/µL
Absolute Reticulocyte CountNormal
86,400cells/µL

Number of reticulocytes per microliter of blood

Corrected Reticulocyte Count1.68%
Reticulocyte Production Index1.68
Maturation factor used1
86,400 cells/uL
Low<25000Normal25000-130000High130000+

ARC is within the normal range at 86.4k cells/uL.

  • A normal ARC in a non-anemic patient suggests healthy bone marrow red cell production.
  • In an anemic patient, a normal or only mildly elevated ARC may still indicate an inadequate marrow response relative to the degree of anemia.
  • The RPI is 1.68, below 2, which suggests the marrow response is inadequate relative to the degree of anemia (hypoproliferative pattern).
  • The corrected reticulocyte count is 1.68%, below 2%, consistent with hypoproliferative anemia.

Next stepThese values are screening tools: always correlate with the full CBC, peripheral blood smear, LDH, haptoglobin, bilirubin, iron studies, and clinical presentation before concluding a diagnosis.

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