I'm struggling with this test question on my NCLEX test prep CD. What's the correct answer?
A client with pretransfusion hemoglobin and hematocrit values of 9 grams and 27 percent, respectively, received two units of packed red blood cells. The nurse determines the transfusions were effective when repeat laboratory tests indicate which of the following results?
A. 11 g, 33%
B. 12 g, 36%
C. 13 g, 30%
D. 15 g, 39%
I thought that each unit of PRBCs raised the hgb by 1 g and the hct by up to 3%, so I chose A. The CD says the correct answer is C, 13 g, 30%.
Am I insane? What am I doing wrong? Or is the disk wrong? I've come across this type of question several times and always come up with a different calculation than what the disk says is correct.
Thanks for your help.