Problem:
I went to give blood the other day, and they take an "iron" measurement prior to actually drawing the blood. My level was 16.4 -- but what specific type of iron were they measuring?
I've heard of ferritin, transferrin, iron binding cap, total, etc., but when I asked what the upper limit was, she said 19, which didn't really fit within the healthy ranges I can find for the above types.
Please provide some thoughts.