Apr 2, 2015




Clinical Hub,Tools & Resources,UWHC Lab Test Directory,Hematology

Reticulocyte Count

Reticulocyte Count (RET) Hematology Lab Test

Name: Reticulocyte Count

Test Name: Reticulocyte Count

Health Link Test Code: RET

LIS Test Code: RTC

CPT Code(s): 85045

Methodology: Fluorescence

Days Performed: Daily, 24 hours.

In-Lab Turnaround Time: 4 hours.

Stat In-Lab Turnaround Time: 1 hour.

Specimen: Blood

Collection Container: K3EDTA-Lavender top

Also Acceptable: K2EDTA-Lavender top, Pink top tube

Collection Volume: 4 mL

Pediatric Collection Volume: 1 mL

Stability Ambient:

24 hours

Stability Refridgerated:

Not acceptable

Stability Frozen:

Not acceptable

Sample Analyzed: Whole Blood

Testing Volume: 1 mL

Pediatric Testing Volume: 0.25 mL in microtainer

Specimen Transport:

Transport specimen to laboratory at ambient temperature.

Unacceptable Criteria:

Clotted specimens are not acceptable. Tubes with <25% of fill volume.



Absolute Reticulocyte:  
 Ages 0-3 days

147 - 216 K/uL

 Ages 4 days and up  30 - 115  K/uL

Immature Reticulocyte Fraction


 Ages 4 days and up

0.0 - 25.0%




Interpretation Type: Reference Interval