What does it mean. when my doctor says my red blood cells is out of range?

Please Clarify: There has to be more to the story. Is it high or low? What else is going on? What other tests are they considering?

Probably anemia: "range" on a lab test is where 95% or so of healthy people fall. Your physician is probably telling you that your are mildly anemic, and you will get a workup for possible blood loss or hemolysis if this is new. Occasionally, people with mild thalassemia have high red cells because they are small in the absence of significant anemia.