SHR # 2269 :: Is Hemoglobin A1c Reliable plus What Causes Runner's Anemia :: Dr. Adam Rogers - Thinking clinicians have been asking this question. Measuring A1c depends upon red blood cell turnover to be at 120 days. But what if your red blood cells turnover faster or slower? PLUS Distance runners develop anemia pretty regularly from their training. Their iron levels seem to just dissipate. What is the possible mechanism for this phenomenon? What can runner's do to mitigate this? ::