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Red Blood Cell (RBC) Count CPT: 85041

Synonyms

Erythrocyte Count

Expected Turnaround Time

Within 1 day

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 8 to 10 times immediately after tube is filled at the 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

Patient Information

To evaluate the number of red blood cells (RBCs); to screen for, help diagnose, or monitor conditions affecting red blood cells.

As part of a complete blood count (CBC), during a health checkup, or when a healthcare practitioner suspects that you have a condition such as anemia (decreased number of RBCs) or polycythemia (increased number of RBCs).

A blood sample drawn from a vein or by a fingerstick (children and adults) or heelstick (newborns).