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Laboratory Medicine

Test catalogue

Reticulocytes Count (Retics)

Test Name

Reticulocytes Count (Retics)

Lavender Tube Microtainer Tube Specimen Type / Requirements

p>Container Type = Lavender

Minimum Venous Volume (Lavender) = 1mL whole blood

Minimum volume (Pink Microtainer tube) = 250µL whole blood.

Specimen Handling

Collection Instructions: Collect sample in a lavender top and send to core lab. Sample should be well mixed at time of collection to prevent platelet clumping. Write your initials, date and time of collection on the collection label.

Stability: Reticulocyte count should be done within 24 hours if stored at room temperature and 72 hours if stored at 2 to 8°C due to in vitro maturation

Transportation: Transport at room temperature as soon as possible.

Sample Rejection Criteria: Plasma, clotted sample, unlabeled or samples of non sufficient quantity.

Required Documentation

Turnaround Time (TAT)

30 Mins

Test Utilization

Reference Value

Adults: 38-116 x 109/L


Age: 0 – 24 hours: 200 – 300 x 109/L
Age: 2 - 6 days: 15 – 250 x 109/L
Age: 7 – 29 days: 5 – 50 x 109/L
Age: 30 – 59 days: 5 – 100 x 109/L
Age: 60 – 89 days: 5 – 150 x 109/L
Age: 90 – 179 days: 5 – 250 x 109/L
Age: 180 – 366 days: 10 – 100 x 109/L
Age: 1 – 13 years: 10 – 100 x 109/L

Test Code



Coulter/Impedance principle

Testing Location


Other Information

Last Updated: March 06, 2020