Red Blood Cell (RBC) Count

CPT: 85041
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Synonyms

  • Erythrocyte Count

Expected Turnaround Time

Within 1 day


Related Documents


Specimen Requirements


Specimen

Whole blood


Volume

Tube fill capacity


Minimum Volume

0.5 mL (500 μL for pediatric microtainer capillary tubes; fill tube to capacity.)


Container

Lavender-top (EDTA) tube


Collection

Invert tube immediately 8 to 10 times once tube is filled at time of collection.


Storage Instructions

Maintain specimen at room temperature.


Stability Requirements

Temperature

Period

Room temperature

1 day

Refrigerated

3 days

Frozen

Unstable

Freeze/thaw cycles

Unstable


Causes for Rejection

Hemolysis; clotted specimen; tube not filled with minimum volume; improper labeling; transport tubes with whole blood; specimen drawn in any anticoagulant other than EDTA; specimen diluted or contaminated with IV fluid; specimen received with plasma removed


Test Details


Use

Evaluate anemia and loss of red cells and suspected polycythemic condition


Limitations

Presence of cold agglutinins may result in falsely low RBC counts.


Methodology

Automated cell counter


Additional Information

Decrease in RBC count may be the result of red cell loss by bleeding or hemolysis (intravascular or extravascular), failure of marrow production (due to a broad variety of causes), or may be secondary to dilutional factors (eg, intravenous fluids). Increase in RBC count may be the result of primary polycythemia (polycythemia vera) or secondary polycythemia (hypoxemia of lung or cardiovascular disease, increased erythropoietin production associated with renal cyst, renal cell carcinoma, cerebellar hemangioblastoma, or high O2 affinity hemoglobinopathy) including stress polycythemia (hemoconcentration associated with exercise, exertion, fright, etc).


LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
005033 RBC 789-8 005033 RBC x10E6/uL 789-8

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