Reticulocyte Count 
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Divide absolute reticulocyte count (reticulocytes x 10^{9}/L) by 10
Then divide the answer by the red blood cell count (RBC x 10^{12}/L)
The reticulocyte count – range (%) and (x10^{9}/L) in the first 3 months of life in term infants^{*}
Age 
%  x 10^{9}/L 
1 day  3.07.0  110445 
7 days  <0.11.3  <1080 
4 weeks  <0.11.2  <1065 
8 weeks  0.12.9  <10125 
12 weeks  0.41.6  1575 
>12 weeks  0.22.0  10105 
* Data from various sources, based on microscope counts
1  Paediatric Haematology. Eds Lilleyman JJ, Hann I, Churchill Livingstone 1992. 