Question

Calculate the ARC, CRC, and RPI for a patient with 1.8% retic count, a Hct of 22%, and a RBC count of 3.5 x 10¹² L.

Calculate the ARC, CRC, and RPI for a patient with 0.2% retic count with a Hct of 34%, and a RBC count of 4.4 x 10¹² L.

Calculate the ARC, CRC, and RPI for a patient with 4.7% retic count with a Hct of 17, and a RBC count of 2.4 x 10¹² L.

Answer 1

1.Absolute recticulocyte count(ARC)=Rectic count/100*RBC count

=1.8/100*(3.5*10^12)

=63000cell/mm^3

Corrected recticulocyte count(CRC)=Rectic count*Hematocrit/Normal hematocrit(15%)

=1.8*22/15

= 2.64%

Recticulocyte production index(RPI)=CRC/Maturation correction

Finding matuartion correction

Hematocrit(36-45)-Maturation correction(0.1)

Hematocrit(26-35)-Maturation correction(1.5)

Hematocrit(16-25)Maturation correction(2.0)

Hematocrit(15 and below)-Matuartion correction(2.5)

So RPI=2.64/2.0=1.32%

2.ARC=Rectic count/100*RBCcount

=0.2/100*(4.4*10^12)

=8800cell/mm^3

CRC=Rectic count*Hematocrit/Normal hematocrit(15)

0.2*34/15

=0.45%

RPI=CRC/maturation correction

=0.45/1.5

=0.3%

3.ARC=Rectic count/100*RBCcount

=4.7/100*2.4*10^12

=112800cell/mm3

CRC=Rectic count*Hematocrit/Normal Hematocrit(15)

4.7*17/15

=5.32%

RPI=CRC/Maturation count

=5.32/2

=2.66%