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EPIC CODE: LAB296 Reticulocyte Count


Sunquest: RETLMW


UPH Methodist Hospital
UPH Pekin Hospital
UPH Proctor Hospital


One 3 mL lavender (EDTA). (2.0 mL minimum)
Neonate: One full lavender microtainer

Storage/Transport Temperature

3 mL whole blood (lavender, EDTA). room temperature or refrigerated

Stability (from collection to initiation)

Ambient (room temperature): 8 hours; Refrigerated: 48 hours

Unacceptable Conditions

Frozen samples and/or clotted samples.

Days Performed

Hematology (Sunday – Saturday)

Reference Interval

Reticulocyte Count 0.66-2.35%
Absolute Reticulocyte 0.00-0.39 x10*6/uL
Immature Reticulocyte Fraction (IRF) 0.00-13.33%

Interpretive Data

The laboratory has changed hematology analyzers. Note new reference ranges that apply to the reticulocyte test.

CPT Codes



Reticulocyte counts are reflective of the rate of red cell production in the bone marrow. Normally circulating reticulocytes account for approximately 1% of circulating RBCs. After a severe blood loss there is an increased production of red cells with elevation of reticulocyte counts and release of increasing numbers of immature reticulocytes into the circulation with corresponding elevation of the IRF (Immature Reticulocyte Fraction).\nOur present manual method value is reported as a corrected reticulocyte count percentage based on the patient’s hematocrit value. The new automated reticulocyte count percentage will represent an uncorrected value, which will be a higher value. In addition to the % reticulocytes, the new methodology will include an absolute reticulocyte number (x 106/uzlz0 and an IRF (Immature Reticulocyte Fraction).